# How To Substantiate Plastic Reduction Claims Step by Step

> Learn to back plastic reduction claims with solid evidence. The Wellness Quality Institute helps you build a defensible substantiation file.

**Published:** 2026-09-20 | **Updated:** 2026-10-31 | **Author:** mihir
**URL:** https://www.wellnessqualityinstitute.com/articles/how-to-substantiate-plastic-claims
**Type:** post

**Categories:** Certification

![How To Substantiate Plastic Reduction Claims Step by Step](https://wellnessquality.sites.aigrowthagent.co/wp-content/uploads/sites/93/2026/09/1789815525314-5c63ebc37b51-1024x572.webp)

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## Content

*Written by: Scott Steveson, Specialist, Wellness Quality Institute | Last updated: October 20, 2026*

## Key Takeaways

- Substantiating plastic reduction claims requires a documented baseline, a clear calculation method, and reviewed data that exist before the claim is published.
- Four distinct claim types – reduction by weight, virgin-plastic reduction, plastic waste reduction, and “plastic-free” – each demand different evidence and cannot be swapped for one another.
- Claim wording must match the evidence exactly, so a weight reduction alone supports only a weight-reduction claim.
- No laboratory can prove absolute “plastic-free” status because detection floors leave smaller particles unmeasured, so claims must match what the method can verify.
- The Wellness Quality Institute provides independent Plastic-Free Pathway Verification that reviews existing lab data against defined standards and issues scope-locked claim language.

[Talk to The Wellness Quality Institute about Plastic-Free Pathway Verification.](https://www.wellnessqualityinstitute.com/?utm_term=how-to-substantiate-plastic-claims&utm_campaign=ai_growth_agent)

## What “Substantiating” A Plastic Reduction Claim Actually Means

Substantiation, meaning the evidence trail that proves a claim is true, is a traceable chain of records tying specific claim wording to a documented baseline, a calculation method, and reviewed data. This chain must exist before the claim is published. The [FTC Green Guides (16 CFR Part 260)](https://www.ftc.gov/legal-library/browse/rules/green-guides) recommend that a reasonable basis for an environmental claim exist before the claim is made, and that basis for objective claims often means competent and reliable scientific evidence, such as tests or analyses conducted by qualified professionals using methods generally accepted in the relevant field.

The seven steps that follow map directly to how to substantiate plastic reduction claims:

1. Define the claim type.
2. Build the baseline.
3. Map claim wording to required evidence.
4. Calculate the reduction correctly.
5. Respect the measurement ceiling.
6. Lock the scope.
7. Convert evidence into a checkable claim.

A few terms used throughout this article, in plain language:

- **Substantiation:** the evidence file that proves a claim is true.
- **Baseline:** the documented starting point, such as the product, weight, or volume you are comparing against.
- **Reference period:** the time window the baseline covers, such as the prior 12‑month production run.
- **Source reduction:** reducing the amount of material used in a product or package before it is made.
- **Scope lock:** limiting a claim to exactly the product, component, production period, and evidence that support it.
- **Detection floor:** the smallest particle size or lowest concentration a laboratory instrument can reliably find. Anything below it is invisible to that method.
- **Reporting limit:** the lowest level at which a laboratory will report a result as a detected quantity rather than “not detected.”
- **Chain of custody:** the documented record showing who handled a sample from collection through analysis.
- **Independent review:** assessment by a party with no commercial interest in the outcome and no role in producing the data.

The regulatory and legal context shapes how these claims are judged. The [FTC Green Guides date to 2012](https://ftc.gov/legal-library/browse/rules/green-guides), and current legal review is required before publishing any claim. [ISO 14021](https://www.iso.org/standard/66652.html), the international standard for self-declared environmental claims, sets parallel requirements. Retailer and procurement diligence on plastic claims is intensifying, and class-action litigation is actively pursuing brands whose plastic claims lack support. US brands selling through channels that reach EU consumers may also encounter the EU Empowering Consumers for the Green Transition Directive, which has applied since 27 September 2026, and California SB 54, as external pressures that influence how closely claims are scrutinized.

If you want evidentiary thresholds in more detail, see [Plastic Claim Substantiation: Evidence Thresholds Under FTC](https://www.wellnessqualityinstitute.com/articles/plastic-claim-substantiation-requirements/?utm_term=how-to-substantiate-plastic-claims&utm_campaign=ai_growth_agent). This article focuses on the wording decision: what sentence a given dataset can actually support. For the full process end to end, [How To Substantiate a Plastic Reduction Claim](https://www.wellnessqualityinstitute.com/articles/substantiate-plastic-reduction-claims/?utm_term=how-to-substantiate-plastic-claims&utm_campaign=ai_growth_agent) gives a complementary overview, and [Defensible Plastic Reduction Claims: A Verification Guide](https://www.wellnessqualityinstitute.com/articles/defensible-plastic-reduction-claims-verification/?utm_term=how-to-substantiate-plastic-claims&utm_campaign=ai_growth_agent) covers the verification pathway in depth.

[See whether your existing lab data can carry your claim and start a Plastic-Free Pathway review.](https://www.wellnessqualityinstitute.com/?utm_term=how-to-substantiate-plastic-claims&utm_campaign=ai_growth_agent)

## Step 1: Define The Claim Type First

Clear claim type selection prevents most substantiation problems. Before any other work begins, write the claim type on one line. The four most common plastic reduction claim types each require different evidence, and mixing them is the most frequent brand error.

**Reduction by weight** means the product or package uses less plastic mass per unit than a documented baseline. The evidence is a weight specification for the current component and a dated weight specification for the prior version, with the same functional unit, such as grams of plastic per bottle.

**Virgin-plastic reduction** means the share of new, non-recycled plastic in the product has decreased. The evidence requires material declarations from the supply chain that distinguish virgin from recycled polymer content. Weight reduction alone does not establish this change.

**Plastic waste reduction** means less plastic ends up as waste, typically through recyclability, reuse, or take-back programs. This is an outcome claim about what happens after use. It requires evidence of actual end-of-life outcomes for the packaging, not just its weight.

**“Plastic-free”** is a different category entirely, addressed in Step 5. It is a claim about absence, and absence is what current laboratory methods cannot prove across all particle sizes and polymers.

These three reduction claim types are not interchangeable, and the difference shows up in what each one can prove. A lighter bottle made entirely of virgin resin supports a weight-reduction claim, but not a virgin-plastic reduction claim, because nothing about its weight shows how much of the resin is recycled. Likewise, a package with 30% recycled content supports a virgin-plastic reduction claim but not a waste-reduction claim unless you can document what happens to it after use.

**Decision point:** write the claim type on one line before any other work begins.

## Step 2: Build The Baseline

A baseline gives every percentage reduction an anchor. It is the documented starting point against which the reduction is measured. Without a dated baseline, a percentage reduction is just a number.

The baseline document should specify:

- The product or component being measured, such as the bottle body rather than the cap.
- The reference period, typically the prior 12‑month production run or the immediately preceding product version.
- The comparison basis, such as your own prior product, a competitor, or an industry average, stated explicitly, because the FTC Green Guides at [16 CFR § 260.17](https://www.ecfr.gov/current/title-16/chapter-I/subchapter-B/part-260) require that a source reduction claim state the basis of comparison and the amount of the reduction.
- Retained specification sheets, meaning the actual weight or material records, not only a summary.

ISO 14021 similarly requires that comparative claims state the basis of comparison and quantify in the same units on the same functional unit. A claim that a package uses “less plastic” without specifying less than what, by how much, and measured how, satisfies neither framework.

**Decision point:** a dated baseline document with the comparison basis stated.

## Step 3: Match Claim Wording To The Evidence You Have

Most plastic reduction claim failures start at this wording step. The evidence a brand holds determines what wording that evidence can support. Source reduction claim evidence must match the specific sentence on the package.

The list below maps six common claim wordings to the records each requires and the wording risks each carries.

### “25% Less Plastic By Weight”

- Dated weight specification for the current component.
- Dated weight specification for the baseline component.
- Calculation sheet showing functional unit and reference period.
- Statement of comparison basis, such as prior version or named competitor.

This wording becomes risky if the comparison basis is unstated or if the reduction is technically true but negligible in absolute terms, such as 2 g to 1.5 g on a 500 g product.

### “Made With Less Plastic”

- Documented reduction in plastic weight or volume per unit.
- Baseline specification and current specification.

This is an unqualified comparative claim, so it must state less than what. It also implies ongoing accuracy, so the baseline must remain current.

### “Reduced Virgin Plastic Content”

- Material declarations from suppliers that distinguish virgin from recycled resin by weight.
- Chain-of-custody records linking recycled content to specific production batches.
- Baseline virgin-content percentage with reference period.

Weight reduction alone does not support this claim. Recycled content must be documented at batch level, not only asserted.

### “Plastic Waste Reduced By X%”

- End-of-life outcome data, such as recycling rates or take-back volumes.
- Baseline waste outcome with reference period.
- Methodology for calculating waste reduction.

Material reduction does not establish waste reduction. This is an outcome claim that needs outcome evidence, not only specification sheets.

### “Plastic-Free Cap”

- Third-party laboratory data for the cap specifically, using a validated method for that material.
- Scope statement limiting the claim to the cap only.
- Method documentation including detection floor and polymer panel tested.

This claim is scoped to one component and must not imply that the whole product or package is plastic-free. Detection floors limit what “plastic-free” can mean, as Step 5 explains.

### “Plastic-Free”

- No laboratory can currently support this as an absolute claim, as Step 5 explains.
- A scoped, pathway-based statement is the defensible alternative.

Absolute absence cannot be proven with current methods, so any absolute “plastic-free” claim carries significant litigation exposure.

**Decision point:** write down the exact claim wording that the evidence can support.

[Need help matching wording to evidence? Ask WQI to review your draft plastic claims.](https://www.wellnessqualityinstitute.com/?utm_term=how-to-substantiate-plastic-claims&utm_campaign=ai_growth_agent)

## Step 4: Calculate The Reduction Correctly

Accurate math keeps a plastic reduction by weight claim aligned with its wording. The calculation follows a straightforward formula, but the arithmetic must match the sentence exactly.

Consider a bottle cap that moves from 20 grams of plastic per unit to 15 grams of plastic per unit. The reduction is (20 − 15) ÷ 20 = 0.25, or 25%. The defensible claim is “25% less plastic by weight in our cap than our previous version,” with the functional unit, the reference period, and the comparison basis stated.

Two errors appear repeatedly in brand files. First, teams restate a weight reduction as a waste reduction. The calculation above shows a 25% reduction in plastic weight per unit. It does not show a 25% reduction in plastic waste, because waste outcomes depend on what happens after the product is sold, such as collection rates, recycling infrastructure, and consumer behavior.

Second, teams round a result to 100% or restate it as “removes all” or “eliminates.” A reduction result, however large, remains a reduction unless the material is entirely absent, and absence requires the kind of proof addressed in Step 5. A 95% reduction is accurately described as a 95% reduction.

**Decision point:** a calculation sheet showing baseline weight, current weight, functional unit, and reference period.

## Step 5: Respect The Measurement Ceiling

Laboratory methods set a ceiling on what “plastic-free” can mean. No laboratory can support an absolute “plastic-free” claim because detection establishes presence, not absence across all sizes and polymers.

Finding a plastic particle requires one positive result. Proving that no plastic is present would require certainty about everything the method cannot see, including every particle below the detection floor, every polymer outside the tested panel, and every production lot that was not sampled.

![Fragments of plastic suspended in blue water below the surface.](https://cdn.aigrowthmarketer.co/1784829388732-c6255482b477.webp)**Plastic doesn't disappear — it fragments. These secondary microplastics are the breakdown products of everyday objects, and independent research now detects them across the water supply. Detection, though, establishes presence, not absence.**

Raman spectroscopy is validated for particles from 20 µm to 5,000 µm. Infrared spectroscopy is validated from 50 µm to 5,000 µm. Regulatory definitions of microplastics, such as California’s, may reach down to 1 nanometer. No current analytical method can reliably measure that small, and the 1–20 µm fraction is not validated under either method. Everything below that range sits beyond reliable commercial measurement today.

![Colorful plastic fragments in water inside a laboratory petri dish.](https://cdn.aigrowthmarketer.co/1784829410323-fb401fc7b1e4.webp)**Microplastics are particles smaller than five millimeters. Current methods can count and identify them at the upper end of that range, but reliable measurement falls away as particles get smaller — a limit that shapes every honest claim.**

A laboratory result reading “none detected” means none were found above that instrument’s detection floor, for the polymers it screened, in the lot it tested. The phrase does not mean none are present. A brand that publishes “plastic-free” based on a “none detected” result is making a claim the data cannot support.

The defensible alternative is a scoped, pathway-based statement. That statement describes what was tested, by what method, at what detection floor, for which polymers, and in which production lot. It also describes the result within those bounds.

**Decision point:** replace any absolute wording with a scoped, pathway-based statement.

## Step 6: Lock The Scope

Scope lock keeps a true result from being stretched beyond its evidence. A scope-locked result applies only to the reviewed product, the specific matrix tested, the tested particle-size range, the polymer panel screened, and the production period sampled.

This discipline matters most when a retailer buyer, a journalist, or a plaintiff’s attorney examines the claim. A scope-locked claim is defensible because it says exactly what it covers. A claim extended beyond its evidence creates greenwashing exposure.

Common scope errors include:

- Using a single SKU’s lab result to support a brand-level “plastic-free” claim.
- Using a test on one production lot to support a permanent, undated claim.
- Using a result for the product liquid to support a claim about the packaging material.
- Using a result for one polymer type to support a claim about all plastics.

**Decision point:** a written scope statement that matches the claim wording exactly.

## Step 7: Convert Evidence Into A Checkable Claim

Turning lab data into a market claim requires independent review. A lab report sitting in a folder remains internal data, and self-reported data, however rigorous, is read as marketing because the company grading its own homework has an obvious interest in the grade.

Independent third-party review changes how the claim is received. When a party with no commercial interest in the outcome and no role in producing the data reviews the dataset against published criteria and issues a finding, the claim carries weight that self-reporting cannot match.

The Wellness Quality Institute (WQI) is an independent verification body that reviews US companies’ existing third-party laboratory data on plastic and microplastic content against a defined standard, WQI-CS-01, its Plastic-Free Pathway Verification standard aligned with drinking-water microplastics reference frameworks. WQI does not perform laboratory testing. It reviews the data, method, product scope, and supporting controls that a company submits.

![Scientists in white coats working with samples and microscopes in a laboratory.](https://cdn.aigrowthmarketer.co/1784829434095-0fc8fbcf29fa.webp)**Only a small number of laboratories can genuinely test for microplastics, and capability varies by instrument and method. WQI reviews a company's existing third-party laboratory data against a defined standard — it does not run the tests itself.**

A WQI review examines laboratory qualification, analytical method, product matrix, sampling, tested particle-size range, target polymer panel, reporting limits, blank results and contamination controls, spike recoveries, replicates, chain of custody, data recency, and product scope. Many companies learn for the first time what their existing data does and does not prove, including where a “none detected” result is bounded by the method’s detection floor rather than by the product.

Every review produces one of two outcomes. Standard Met carries a verification decision, a scope-locked license to use the WQI mark, a public registry listing, and approved claim language. Standard Not Met is a private outcome, available for resubmission with updated information. Participating carries no public downside risk.

A single assessment fee covers review, verification decision, and registry listing, with no separate mark-license or registry fee. Independent laboratory testing is arranged and billed separately by a qualified independent laboratory. Payment of the assessment fee does not guarantee a verification decision.

*WQI Plastic-Free Pathway Verification does not certify that a product contains zero plastic, microplastics, or nanoplastics. It shows that the company is on a verified pathway toward plastic-free standards. Verification applies only to the reviewed products, submitted datasets, tested ranges, polymer panels, production or sampling periods, and supporting controls. WQI verification is not a government approval, government certification, or health or safety certification.*

**Decision point:** submit the dataset or schedule a review conversation.

[Ready for independent review? Schedule a Plastic-Free Pathway Verification conversation with WQI.](https://www.wellnessqualityinstitute.com/?utm_term=how-to-substantiate-plastic-claims&utm_campaign=ai_growth_agent)

## How To Use Frameworks And Decision Tools For Plastic Claims

Four organizing tools help you test whether a substantiation file is complete, comparable, and defensible.

The **claim-type-to-evidence matrix** from Step 3 maps each claim wording to the records it requires. It acts as a first filter. If the records in the file do not match the list for the intended claim, the wording must change or the evidence must be built.

An **evidence hierarchy** ranks the weight different evidence types carry. Independently reviewed data sits above self-reported data, which sits above a supplier declaration, which sits above an assertion. A supplier statement that a material contains recycled content is a starting point, not a complete substantiation file.

A **baseline documentation checklist** confirms that the comparison point is dated, scoped to the right component, expressed in the right units, and tied to a defined reference period.

A **scope definition** confirms that the claim wording covers exactly what the evidence covers.

The [FTC Green Guides at 16 CFR § 260.17](https://www.ftc.gov/legal-library/browse/rules/green-guides) and [ISO 14021](https://www.iso.org/standard/66652.html) address plastic reduction claims from different angles, and a US brand may need to satisfy both, particularly if its products reach EU retail channels.

The FTC Green Guides are US advertising guidance focused on whether a claim is deceptive or misleading under the FTC Act. For source reduction claims, [16 CFR § 260.17](https://www.ecfr.gov/current/title-16/chapter-I/subchapter-B/part-260) requires that the basis of comparison and the amount of the reduction be stated. For general environmental benefit claims, [16 CFR § 260.4](https://www.ecfr.gov/current/title-16/chapter-I/subchapter-B/part-260) provides that unqualified general environmental benefit claims are likely deceptive because marketers rarely can substantiate all reasonable interpretations, so marketers should avoid them. The Guides do not require third-party verification, but they require that substantiation exist before the claim is published and that it be sufficient in quality and quantity under standards generally accepted in the relevant field.

ISO 14021 is a voluntary international standard for self-declared environmental claims. It requires that comparative claims state the basis of comparison and quantify in the same units on the same functional unit, which mirrors the core requirement in the FTC Guides. ISO 14021 also requires that the evaluation be documented before the claim is made and retained for the period the product is on the market. The two frameworks overlap most directly on comparative claims because both require a stated comparison basis, a quantified amount, and records that can be checked. They differ in structure. The FTC Guides are deception-focused and enforcement-backed. ISO 14021 is a requirements standard a brand adopts voluntarily to organize its evidence file.

Wording choices change the evidence path. A brand that reduces the plastic weight of its bottle cap from 20 g to 15 g holds evidence for a “25% less plastic by weight in our cap” claim. If that same brand switches 30% of the cap resin to post-consumer recycled content, it holds separate evidence for a “30% recycled content in our cap” claim. Neither dataset supports the other claim. A “plastic-free cap” claim would require laboratory data for the cap specifically, at a validated detection floor, for a defined polymer panel, and the claim would still need to be scoped to what the method can see.

## Common Challenges And Troubleshooting

Several recurring problems show up in plastic reduction claim files, and each has a practical fix.

**Incomplete documentation.** An early warning sign appears when the evidence file contains a summary or a supplier email rather than original specification sheets or laboratory reports. The usual root cause is that the claim was written before the evidence was assembled. The correction is to build the baseline document first, then write the claim wording to match what the records show.

**Unclear or overbroad scope.** A common warning sign appears when the claim says “our packaging” but the evidence covers only one component. Marketing often writes the claim without checking which components were tested. The correction is to write a scope statement that names the specific product, component, and production period, and then confirm that the claim wording matches it exactly.

**Weak or missing contamination controls.** A warning sign appears when the laboratory report shows no blank results or spike recoveries. This often means the laboratory was not instructed to run contamination controls, or the method does not require them. The correction is to require procedural blanks, field blanks, and spike recoveries as part of the testing protocol before commissioning new work.

**A method unsuitable for the matrix.** A warning sign appears when the laboratory uses a method validated for water to test a solid or semi-solid product. This usually happens because the brand selected a laboratory without confirming method-matrix suitability. The correction is to confirm before commissioning testing that the method is validated for the specific product matrix.

**Inconsistent terminology between marketing and legal.** A warning sign appears when the packaging says “plastic-free” and the legal file says “no plastics detected above 50 µm.” The two teams are working from different documents. The correction is to derive the claim wording on packaging from the approved claim language in the evidence file.

**Conclusions extended beyond what the data shows.** A warning sign appears when a single SKU’s result is used to support a brand-level or product-line claim. Scope lock was not applied. The correction is to ensure every public claim is traceable to the specific dataset that supports it, and that the scope of that dataset matches the scope of the claim.

[Have one of these issues already? Ask WQI to troubleshoot your existing plastic claims.](https://www.wellnessqualityinstitute.com/?utm_term=how-to-substantiate-plastic-claims&utm_campaign=ai_growth_agent)

## Measuring Substantiation Progress And File Quality

A scrutiny-ready substantiation file shows five clear indicators.

- **Completeness:** every record required for the claim type is present, including baseline specification, current specification, calculation sheet, scope statement, and laboratory documentation where applicable.
- **Consistency:** the claim wording on packaging matches the approved language in the evidence file, and both match the scope of the data.
- **Traceability:** the reduction calculation can be followed from the baseline number through the arithmetic to the percentage stated in the claim.
- **Documented controls:** where laboratory data is used, blank results, spike recoveries, and chain-of-custody records are present.
- **Scope match:** the scope statement names the specific product, component, matrix, production period, and, where applicable, the tested particle-size range and polymer panel.

Simple monitoring mechanisms help keep claims accurate over time. A review gate before pack copy is approved, with sign-off from both marketing and legal against the evidence file, reduces risk. A claim register, meaning a living document listing every active plastic claim, the evidence that supports it, the scope it covers, and the date the evidence was last validated, keeps the portfolio organized. Periodic re-checks as products, suppliers, or production processes change ensure that a claim that was accurate at launch remains accurate as the product evolves.

## Advanced Practice: Scaling Claims And Keeping Them Current

Scaling substantiation across products and SKUs works best with a systematic approach. A claim register that tracks each SKU, its claim type, its evidence file, and its review date makes it possible to manage a portfolio of claims without losing track of which evidence supports which wording.

Evidence updates over time keep comparative claims honest. A comparative claim must remain accurate against the current baseline and current competitor data, as the FTC Green Guides note at [16 CFR § 260.3(d)](https://www.ecfr.gov/current/title-16/chapter-I/subchapter-B/part-260). If a supplier changes the resin formulation or a competitor reduces their plastic weight, the claim may no longer be accurate and must be re-evaluated.

For brands using WQI’s Plastic-Free Pathway Verification, the verification period is 24 months from the sampling date of the most recent accepted dataset. Continued claim use after expiration requires re-verification with current data. This reflects the reality of lot-to-lot variability, because a result reflects the production it was drawn from, not all future production. Expired registry entries remain publicly visible and marked “Expired,” so the record stays honest over time.

Readiness for advanced practice, such as managing multiple SKUs, multiple claim types, and re-verification cycles, depends on having the foundational steps in place first. Those foundations include a claim register, a scope-statement discipline, and a review gate before any new claim is published.

[Managing many claims at once? Talk to WQI about building a portfolio-wide Plastic-Free Pathway plan.](https://www.wellnessqualityinstitute.com/?utm_term=how-to-substantiate-plastic-claims&utm_campaign=ai_growth_agent)

## Frequently Asked Questions

**What evidence supports a “25% less plastic” claim?**

A “25% less plastic by weight” claim requires a dated weight specification for the current component, a dated weight specification for the baseline component, a calculation sheet showing the arithmetic in the same units on the same functional unit, and a statement of the comparison basis. The FTC Green Guides require that the basis of comparison and the amount of the reduction be stated clearly. Original specification sheets, not only summaries or supplier emails, form the minimum evidence. The claim must also remain accurate over time, so if the product changes, the evidence must be re-validated.

**How do I calculate plastic reduction by weight per unit?**

Use the formula from Step 4. Subtract the current plastic weight per unit from the baseline plastic weight per unit, then divide by the baseline weight and multiply by 100 to get a percentage. The functional unit must be consistent, such as per bottle, per cap, or per package, and the reference period must be defined. Retain the calculation in the evidence file.

**Does a lab report prove a plastic-free claim?**

A laboratory result reading “none detected” means none were found above that instrument’s detection floor, for the polymers it screened, in the lot it tested. The California State Water Board’s Raman spectroscopy method (SWB-MP2-rev1) is validated for particles greater than 20 µm through 5,000 µm, and the infrared method (SWB-MP1-rev1) is validated for particles greater than 50 µm through 5,000 µm. The California State Water Board’s regulatory definition reaches down to 1 nanometer, which is thousands of times smaller than either method’s lower bound. A “none detected” result coexists with particles potentially present below the detection floor. The defensible alternative is a scoped, pathway-based statement describing what was tested, by what method, at what detection floor, for which polymers, and in which production lot.

**What does scope lock mean in a plastic claim?**

Scope lock means a claim applies only to the specific product, component, matrix, production period, tested particle-size range, and polymer panel that the supporting evidence covers. It cannot be extended to other products, a product line, or the company as a whole. A single SKU’s lab result does not support a brand-level claim, and a test on one production lot does not support a permanent, undated claim. A result for the product liquid does not support a claim about the packaging material. Scope lock keeps the claim narrow enough to remain true when a retailer, journalist, or litigant examines it.

**How do the FTC Green Guides and ISO 14021 differ for reduction claims?**

Both frameworks require that comparative claims state the basis of comparison and quantify in the same units on the same functional unit. The FTC Green Guides are US advertising guidance focused on whether a claim is deceptive under the FTC Act, and they are enforcement-backed and require that substantiation exist before the claim is published. ISO 14021 is a voluntary international standard that a brand adopts to organize its evidence file and document evaluations while the product is on the market.

## Read Next

- [How To Substantiate a Plastic Reduction Claim](https://www.wellnessqualityinstitute.com/articles/substantiate-plastic-reduction-claims/?utm_term=how-to-substantiate-plastic-claims&utm_campaign=ai_growth_agent)
- [Plastic Claim Substantiation: The Evidence Checklist](https://www.wellnessqualityinstitute.com/articles/plastic-claim-substantiation-checklist/?utm_term=how-to-substantiate-plastic-claims&utm_campaign=ai_growth_agent)
- [Plastic Claim Substantiation: Evidence Thresholds Under FTC](https://www.wellnessqualityinstitute.com/articles/plastic-claim-substantiation-requirements/?utm_term=how-to-substantiate-plastic-claims&utm_campaign=ai_growth_agent)
- [How To Substantiate Plastic-Free Claims Without Greenwashing](https://www.wellnessqualityinstitute.com/articles/plastic-free-claims-without-greenwashing/?utm_term=how-to-substantiate-plastic-claims&utm_campaign=ai_growth_agent)
- [How to Verify Plastic Reduction Claims: A 5-Step Audit](https://www.wellnessqualityinstitute.com/articles/verify-plastic-reduction-claims/?utm_term=how-to-substantiate-plastic-claims&utm_campaign=ai_growth_agent)

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## Structured Data

**@graph:**

  **FAQPage:**

  **MainEntity:**

    **Question:**

    - **Name:** What evidence supports a “25% less plastic” claim?
      **Answer:**

      - **Text:** A “25% less plastic by weight” claim requires a dated weight specification for the current component, a dated weight specification for the baseline component, a calculation sheet showing the arithmetic in the same units on the same functional unit, and a statement of the comparison basis. The FTC Green Guides require that the basis of comparison and the amount of the reduction be stated clearly. Original specification sheets, not only summaries or supplier emails, form the minimum evidence. The claim must also remain accurate over time, so if the product changes, the evidence must be re-validated.
    **Question:**

    - **Name:** How do I calculate plastic reduction by weight per unit?
      **Answer:**

      - **Text:** Use the formula from Step 4. Subtract the current plastic weight per unit from the baseline plastic weight per unit, then divide by the baseline weight and multiply by 100 to get a percentage. The functional unit must be consistent, such as per bottle, per cap, or per package, and the reference period must be defined. Retain the calculation in the evidence file.
    **Question:**

    - **Name:** Does a lab report prove a plastic-free claim?
      **Answer:**

      - **Text:** A laboratory result reading “none detected” means none were found above that instrument’s detection floor, for the polymers it screened, in the lot it tested. The California State Water Board’s Raman spectroscopy method (SWB-MP2-rev1) is validated for particles greater than 20 µm through 5,000 µm, and the infrared method (SWB-MP1-rev1) is validated for particles greater than 50 µm through 5,000 µm. The California State Water Board’s regulatory definition reaches down to 1 nanometer, which is thousands of times smaller than either method’s lower bound. A “none detected” result coexists with particles potentially present below the detection floor. The defensible alternative is a scoped, pathway-based statement describing what was tested, by what method, at what detection floor, for which polymers, and in which production lot.
    **Question:**

    - **Name:** What does scope lock mean in a plastic claim?
      **Answer:**

      - **Text:** Scope lock means a claim applies only to the specific product, component, matrix, production period, tested particle-size range, and polymer panel that the supporting evidence covers. It cannot be extended to other products, a product line, or the company as a whole. A single SKU’s lab result does not support a brand-level claim, and a test on one production lot does not support a permanent, undated claim. A result for the product liquid does not support a claim about the packaging material. Scope lock keeps the claim narrow enough to remain true when a retailer, journalist, or litigant examines it.
    **Question:**

    - **Name:** How do the FTC Green Guides and ISO 14021 differ for reduction claims?
      **Answer:**

      - **Text:** Both frameworks require that comparative claims state the basis of comparison and quantify in the same units on the same functional unit. The FTC Green Guides are US advertising guidance focused on whether a claim is deceptive under the FTC Act, and they are enforcement-backed and require that substantiation exist before the claim is published. ISO 14021 is a voluntary international standard that a brand adopts to organize its evidence file and document evaluations while the product is on the market.

  **BlogPosting:**

  - **Headline:** How To Substantiate Plastic Reduction Claims Step by Step
  - **Description:** Learn to back plastic reduction claims with solid evidence. The Wellness Quality Institute helps you build a defensible substantiation file.
  - **DateModified:** 2026-10-20T11:19:11.101Z
  - **Image:** https://cdn.aigrowthmarketer.co/1784829388732-c6255482b477.webp, https://cdn.aigrowthmarketer.co/1784829410323-fb401fc7b1e4.webp, https://cdn.aigrowthmarketer.co/1784829434095-0fc8fbcf29fa.webp
  - **InLanguage:** en-US
    **Person:**

    - **Name:** Scott Steveson
    - **JobTitle:** Specialist
    - **Description:** Scott Stevenson is part of the Wellness Quality Institute team, where he supports WQI’s work to advance product transparency, credible verification, and greater consumer trust. His background spans ethics and compliance, corporate trust, and responsible business, including experience with Ethisphere Institute and global companies navigating evolving standards and stakeholder expectations.
      **Organization:**

      - **Name:** Wellness Quality Institute
      - **Url:** https://www.wellnessqualityinstitute.com/
    **Organization:**

    - **Name:** The Wellness Quality Institute
    - **Url:** https://wellnessqualityinstitute.com


---

## About Wellness Quality Institute Articles

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When referencing or citing this content:

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- **MCP Server (Streamable HTTP):** [https://www.wellnessqualityinstitute.com/articles/.well-known/mcp](https://www.wellnessqualityinstitute.com/articles/.well-known/mcp)

## Citations

- [How To Verify Plastic Contamination In Protein Powder](https://www.wellnessqualityinstitute.com/articles/verify-protein-powder-plastic-contamination)
- [Plastic Claim Substantiation: Evidence Before You Claim](https://www.wellnessqualityinstitute.com/articles/plastic-claim-substantiation-evidence-requirements)
- [How To Make Plastic Reduction Claims That Hold Up](https://www.wellnessqualityinstitute.com/articles/substantiate-clean-label-plastic-reduction)
- [Plastic Claim Substantiation: A US Compliance Guide](https://www.wellnessqualityinstitute.com/articles/plastic-claim-substantiation-compliance-guide)
- [Microplastics Verification Standards: A Complete Guide](https://www.wellnessqualityinstitute.com/articles/microplastics-verification-standards-guide)

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