{"id":358,"date":"2026-09-20T05:02:25","date_gmt":"2026-09-20T05:02:25","guid":{"rendered":"https:\/\/www.wellnessqualityinstitute.com\/articles\/how-to-substantiate-plastic-claims"},"modified":"2026-09-20T05:02:25","modified_gmt":"2026-09-20T05:02:25","slug":"how-to-substantiate-plastic-claims","status":"publish","type":"post","link":"https:\/\/www.wellnessqualityinstitute.com\/articles\/how-to-substantiate-plastic-claims","title":{"rendered":"How To Substantiate Plastic Reduction Claims: A 5-Step Guide"},"content":{"rendered":"<p><em>Written by: Scott Steveson, Specialist, Wellness Quality Institute<\/em><\/p>\n<h2 id=\"key-takeaways\">Key Takeaways<\/h2>\n<ul>\n<li>Plastic reduction claims fail when brands omit the comparison basis required by the FTC Green Guides, which makes the claim unsubstantiable on its face.<\/li>\n<li>A defensible claim states what was reduced, what it was compared to, and by how much, with the comparison basis appearing in the claim language itself.<\/li>\n<li>Substantiation requires a documented baseline captured before the redesign ships, plus a version-controlled calculation file assembled at the moment the claim is made.<\/li>\n<li>Even a lab report stating &#8220;none detected&#8221; is bounded by the method\u2019s detection floor and cannot prove total absence of plastic across all particle sizes and polymer types.<\/li>\n<li>The Wellness Quality Institute provides independent verification that turns existing lab data into a claim brands can support under published criteria.<\/li>\n<\/ul>\n<p><a href=\"https:\/\/www.wellnessqualityinstitute.com\" class=\"solid-button\" target=\"_blank\">Learn how WQI verification strengthens your plastic reduction claims<\/a><\/p>\n<h2>Step 1: Define A Precise Plastic Reduction Claim Under The FTC Green Guides<\/h2>\n<p>The FTC Green Guides govern how environmental marketing claims must be framed and supported. Under <a href=\"https:\/\/greencalculus.com\/standards\/ftc-green-guides\" target=\"_blank\" rel=\"noindex nofollow\">16 CFR \u00a7 260.17<\/a>, a source reduction claim, which asserts that a product uses less material, must state both the amount of the reduction and the basis for comparison. A claim of &#8220;less plastic&#8221; with no reference point is unsubstantiable.<\/p>\n<p>The FTC treats source reduction and waste reduction as materially distinct claim types. A source reduction claim asserts that less material was used in making or packaging the product. A waste reduction claim asserts that less material is discarded, either during production or after consumer use. These are different evidentiary animals, and the table below shows how their evidence requirements diverge: source reduction claims hinge on material weight per unit, while waste reduction claims hinge on discarded-material data.<\/p>\n<table>\n<thead>\n<tr>\n<th>Claim Type<\/th>\n<th>What It Asserts<\/th>\n<th>Required Evidence<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><strong>Source Reduction<\/strong><\/td>\n<td>The product uses less material (e.g., &#8220;30% less plastic by weight&#8221;).<\/td>\n<td>Baseline and new material weight per unit, documented calculation, comparison basis stated in the claim.<\/td>\n<\/tr>\n<tr>\n<td><strong>Waste Reduction<\/strong><\/td>\n<td>The product generates less waste (e.g., &#8220;reduces plastic waste by 50%&#8221;).<\/td>\n<td>Data on material discarded in production or post-consumer, documented methodology for measuring waste reduction.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Every defensible plastic reduction claim contains three elements: what was reduced, compared to what, and by how much. The comparison basis must appear in the claim language itself, not only in the substantiation file. A compliant phrasing looks like: &#8220;30% less plastic by weight compared to our 2022 packaging.&#8221; That sentence answers all three questions.<\/p>\n<p>ISO 14021:2026, the international standard for self-declared environmental claims, provides the international framework for structuring these claims. It requires that comparative claims use the same units of measure and the same method of determination, and that they be quantified over an appropriate time interval, generally 12 months. Referencing ISO 14021:2026 by name and date in a substantiation file signals that the claim was built against a recognized methodology.<\/p>\n<p><a href=\"https:\/\/www.wellnessqualityinstitute.com\" class=\"solid-button\" target=\"_blank\">Get your plastic reduction claim verified by WQI<\/a><\/p>\n<h2>Step 2: Capture A Baseline Record Before The New Packaging Ships<\/h2>\n<p>A defensible plastic reduction claim starts with a clear baseline that exists before the redesign ships. A baseline is not a general description of the old packaging. It is a specific, documented record of the prior state, captured in real time rather than reconstructed later from memory or supplier emails.<\/p>\n<p>A complete baseline record for the prior packaging configuration includes:<\/p>\n<ul>\n<li>Plastic type for each component, such as PET, PP, or HDPE<\/li>\n<li>Weight per unit for each plastic component, measured and recorded<\/li>\n<li>Dimensions and packaging configuration<\/li>\n<li>Units sold and the time period the baseline covers<\/li>\n<li>Supplier declarations confirming material composition<\/li>\n<li>Packaging drawings or specifications in effect at the baseline date<\/li>\n<\/ul>\n<p>The baseline must be documented before the redesign ships because a reconstructed baseline carries little evidentiary weight. A retailer, litigator, or regulator reviewing the file will ask when the baseline was recorded and what contemporaneous documents support it. If the answer relies on estimates created after launch, the claim sits on weak ground.<\/p>\n<p>As <a href=\"https:\/\/packaging-gateway.com\/features\/packagings-green-claims-enter-the-age-of-proof\" target=\"_blank\" rel=\"noindex nofollow\">Packaging Gateway&#8217;s 2026 analysis of green claims evidence<\/a> notes, regulators now ask three linked questions for any packaging environmental claim: what environmental benefit is being claimed, how was it measured, and what evidence supports it, with the scope of evidence matching the scope of the claim.<\/p>\n<p><a href=\"https:\/\/www.wellnessqualityinstitute.com\" class=\"solid-button\" target=\"_blank\">Build a baseline that will stand up to review with WQI guidance<\/a><\/p>\n<h2>Step 3: Calculate The Reduction With A Clear, Documented Formula<\/h2>\n<p>The calculation for a source reduction percentage is simple, and it must be documented explicitly so anyone can follow it. The formula is:<\/p>\n<p><strong>(Baseline plastic weight per unit \u2212 New plastic weight per unit) \u00f7 Baseline plastic weight per unit \u00d7 100 = Reduction percentage<\/strong><\/p>\n<p>A worked example makes this concrete. Suppose a brand&#8217;s prior bottle used 28 grams of PET plastic per unit and the redesigned bottle uses 19.6 grams of PET per unit. The calculation is:<\/p>\n<p>(28 \u2212 19.6) \u00f7 28 \u00d7 100 = 30%<\/p>\n<p>The resulting claim language, with the comparison basis stated explicitly, reads: &#8220;30% less plastic by weight per unit compared to our previous bottle design, in use from January 2022 through December 2023.&#8221;<\/p>\n<p>That sentence is defensible. It names what was reduced, what it was compared to, by how much, and over what reference period. The comparison basis appears in the claim itself, not only in the file behind it. <a href=\"https:\/\/greencalculus.com\/standards\/ftc-green-guides\" target=\"_blank\" rel=\"noindex nofollow\">Under 16 CFR \u00a7 260.17 of the FTC Green Guides<\/a>, that level of specificity is a requirement.<\/p>\n<p>The calculation spreadsheet, with inputs, formula, and output, belongs in the substantiation file. Version-control the spreadsheet so the file reflects the calculation as it existed when the claim was published.<\/p>\n<h2>Step 4: Build A Substantiation File That Connects Claim To Evidence<\/h2>\n<p>The substantiation file is the document set that connects the published claim to the evidence behind it. A reviewer, retailer, or litigator will request this file. It needs to be assembled at the moment the claim is made, not after a challenge arrives.<\/p>\n<p>A complete substantiation file for a plastic reduction claim includes:<\/p>\n<ul>\n<li><strong>Bills of materials<\/strong> for both the baseline and new packaging configurations, showing plastic type and weight per component<\/li>\n<li><strong>Supplier declarations<\/strong> confirming material composition for both configurations<\/li>\n<li><strong>Packaging drawings or specifications<\/strong> for both configurations, dated<\/li>\n<li><strong>Weighing records<\/strong> documenting measured weights, not estimated ones<\/li>\n<li><strong>Production and sales volume data<\/strong> for the baseline period<\/li>\n<li><strong>Calculation spreadsheet<\/strong> with formula, inputs, and output, version-controlled<\/li>\n<li><strong>The claim language as published<\/strong>, including the channel, date, and version of the artwork or copy<\/li>\n<li><strong>Legal or compliance approval record<\/strong> showing who reviewed the claim before publication<\/li>\n<\/ul>\n<p>A raw lab report alone does not become a defensible market claim, because self-reported results carry less weight than independently reviewed data. Without independent review, even rigorous data is often perceived as marketing. <a href=\"https:\/\/greencalculus.com\/standards\/cma-green-claims-code\" target=\"_blank\" rel=\"noindex nofollow\">The CMA Green Claims Code&#8217;s Principle 6<\/a> reinforces this point: substantiation must exist before the claim is made, rather than being assembled later as a defense.<\/p>\n<p><a href=\"https:\/\/www.wellnessqualityinstitute.com\" class=\"solid-button\" target=\"_blank\">See how WQI review strengthens your substantiation file<\/a><\/p>\n<h2>Step 5: Respect The Measurement Floor That Limits Your Claim<\/h2>\n<p>Detection establishes presence, but proving absence is a fundamentally different and far harder claim. Finding a plastic particle in a sample is comparatively straightforward. A lab isolates it, confirms chemically that it is a polymer, and reports it. Proving that no plastic is present would require ruling out everything the method cannot see, including particles below the detection floor, polymers outside the tested panel, and production lots that were not sampled.<\/p>\n<figure style=\"text-align: center\"><img decoding=\"async\" src=\"https:\/\/cdn.aigrowthmarketer.co\/1784829388732-c6255482b477.webp\" alt=\"Fragments of plastic suspended in blue water below the surface.\" style=\"max-height: 500px\" loading=\"lazy\"><figcaption><em>Plastic doesn&#039;t disappear \u2014 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.<\/em><\/figcaption><\/figure>\n<p>The California State Water Board&#8217;s validated analytical methods define the current technical boundary for microplastic testing in water. SWB-MP2-rev1, which uses Raman spectroscopy, is validated only for particles between 20 \u00b5m and 5,000 \u00b5m. <a href=\"https:\/\/www.waterboards.ca.gov\/drinking_water\/certlic\/drinkingwater\/docs\/2022\/mp-mthd-1-ir.pdf\" target=\"_blank\" rel=\"noindex nofollow\">SWB-MP1-rev1<\/a>, which uses infrared spectroscopy, is validated only for particles between 50 \u00b5m and 5,000 \u00b5m. The 1\u201320 \u00b5m fraction is not validated under either method.<\/p>\n<p>California&#8217;s regulatory definition of microplastics in drinking water reaches down to 1 nanometer. The best validated methods begin at 20 or 50 micrometers, which are thousands of times larger. That gap reflects a hard technical limit with three main causes:<\/p>\n<ul>\n<li><strong>Particle-size limits:<\/strong> No method detects every particle size, and none reach reliably into the nanoplastic range, which covers particles smaller than 1 \u00b5m.<\/li>\n<li><strong>Polymer diversity:<\/strong> No single test screens every polymer type across every product format.<\/li>\n<li><strong>Lot-to-lot variability:<\/strong> A clean result on one production lot does not guarantee the next lot will match it.<\/li>\n<\/ul>\n<p>A lab report reading &#8220;none detected&#8221; means no particles were found above that instrument&#8217;s detection floor, for the polymers it screened, in the lot it tested. As a <a href=\"https:\/\/link.springer.com\/article\/10.1186\/s43591-026-00192-7\" target=\"_blank\" rel=\"noindex nofollow\">2026 review published in Microplastics and Nanoplastics<\/a> states, the lower size boundary of a microplastics method must be documented. Without that boundary, a &#8220;none detected&#8221; conclusion is incomplete because it does not show what particle sizes fell outside the method&#8217;s capability.<\/p>\n<figure style=\"text-align: center\"><img decoding=\"async\" src=\"https:\/\/cdn.aigrowthmarketer.co\/1784829410323-fb401fc7b1e4.webp\" alt=\"Colorful plastic fragments in water inside a laboratory petri dish.\" style=\"max-height: 500px\" loading=\"lazy\"><figcaption><em>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 \u2014 a limit that shapes every honest claim.<\/em><\/figcaption><\/figure>\n<p>No laboratory today can confirm the complete absence of plastic across every particle size, polymer type, and production lot. Total absence claims sit beyond what current science can support. The strongest claims stay within what the measurement method can actually detect, and the substantiation file explains those limits clearly.<\/p>\n<p><a href=\"https:\/\/www.wellnessqualityinstitute.com\" class=\"solid-button\" target=\"_blank\">Align your claims with what labs can truly measure<\/a><\/p>\n<h2>How The Wellness Quality Institute Turns Your Substantiation File Into A Supported Claim<\/h2>\n<p>The Wellness Quality Institute (WQI) is an independent verification body that reviews companies&#8217; existing third-party laboratory data on plastic and microplastic content against a defined standard. This process helps brands substantiate real progress toward plastic-free standards while avoiding impossible zero-plastic claims.<\/p>\n<figure style=\"text-align: center\"><img decoding=\"async\" src=\"https:\/\/cdn.aigrowthmarketer.co\/1784829434095-0fc8fbcf29fa.webp\" alt=\"Scientists in white coats working with samples and microscopes in a laboratory.\" style=\"max-height: 500px\" loading=\"lazy\"><figcaption><em>Only a small number of laboratories can genuinely test for microplastics, and capability varies by instrument and method. WQI reviews a company&#039;s existing third-party laboratory data against a defined standard \u2014 it does not run the tests itself.<\/em><\/figcaption><\/figure>\n<p>WQI&#8217;s core program, Plastic-Free Pathway Verification (PFPV), is governed by the standard WQI-CS-01. WQI reviews a company&#8217;s existing independent laboratory dataset, testing methodology, product scope, and supporting controls against defined criteria focused on particle size and polymer type. Those criteria align with the California State Water Board&#8217;s drinking-water microplastics reference framework, which is the most stringent public reference reasonably applicable to testing today. California serves as a technical reference point, not a geographic boundary. Verification is available to US companies nationally. California did not create, approve, authorize, or endorse WQI or its standard.<\/p>\n<p>WQI does not run laboratory tests and does not certify that any product is free of plastic. It reviews the existing dataset, method, product scope, and supporting controls against defined criteria. The review examines laboratory qualification, analytical method, product matrix, tested particle-size range, target polymer panel (at minimum PE, PP, PET, PS, PVC, PA, PC, and PMMA), reporting limits, blank results, contamination controls, chain of custody, data recency, and product scope.<\/p>\n<p>Every review produces one of two outcomes. <strong>Standard Met<\/strong> carries a verification decision, a scope-locked license to use the WQI logo (&#8220;WQI Plastic-Free Pathway Verified&#8221;), a public registry listing, and approved claim language. <strong>Standard Not Met<\/strong> is a private outcome that is never described as a failed product and never listed publicly. It can reflect insufficient data, an unsupported method, or incomplete scope rather than anything about the product itself, and the company may resubmit with updated information.<\/p>\n<p>Verification is locked to the reviewed product, dataset, tested particle-size range, polymer panel, and production period. No company-wide or product-line claim may be extended from a single dataset. 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. The verification period is 24 months from the sampling date of the most recent accepted dataset.<\/p>\n<p><a href=\"https:\/\/www.wellnessqualityinstitute.com\" class=\"solid-button\" target=\"_blank\">See how WQI verification turns your lab data into a defensible claim<\/a><\/p>\n<h2>Frequently Asked Questions About Plastic Reduction Claims And WQI<\/h2>\n<h3>What Counts As A Plastic Reduction Claim Under The FTC Green Guides?<\/h3>\n<p>A plastic reduction claim is any comparative claim that states or implies a product uses less plastic than a previous version or another defined benchmark. Under the FTC Green Guides, such a claim must state the amount of reduction and the basis for comparison to be substantiable. A claim that says only &#8220;less plastic&#8221; without identifying what it is less than, and by how much, does not meet the standard. The comparison basis must appear in the claim language itself, not only in the supporting documentation.<\/p>\n<h3>How Do I Calculate A Plastic Reduction Percentage?<\/h3>\n<p>Use the formula: baseline plastic weight per unit minus new plastic weight per unit, divided by baseline plastic weight per unit, multiplied by 100. The bottle example in Step 3 shows how this works in practice and yields a 30% reduction. The calculation must be documented in a version-controlled spreadsheet, and the comparison basis, including the reference product and period, must be stated in the claim itself.<\/p>\n<h3>What Documents Belong In A Plastic Reduction Claim Substantiation File?<\/h3>\n<p>A substantiation file typically includes bills of materials, supplier declarations, dated packaging drawings or specifications, weighing records, production and sales data for the baseline period, the calculation spreadsheet, the published claim language, and a legal or compliance approval record. This file needs to be assembled before the claim is made, not reconstructed after a challenge. A raw lab report alone does not constitute a substantiation file for a reduction claim.<\/p>\n<h3>Why Is A Lab Report Saying &#8220;None Detected&#8221; Not Enough To Claim &#8220;Plastic-Free&#8221;?<\/h3>\n<p>&#8220;None detected&#8221; means no particles were found above the instrument&#8217;s detection floor, for the polymers it screened, in the lot it tested. That statement does not prove the complete absence of plastic across all particle sizes, polymer types, and production lots. The California State Water Board&#8217;s validated Raman method begins at 20 \u00b5m and the validated infrared method begins at 50 \u00b5m, so everything below those thresholds, including the entire nanoplastic range, sits outside what either method can reliably detect. A &#8220;none detected&#8221; result describes what the method could see, rather than guaranteeing absence.<\/p>\n<h3>How Long Does WQI Verification Remain Valid For A Product?<\/h3>\n<p>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. Expired registry entries remain publicly visible and marked &#8220;Expired,&#8221; so the record stays honest over time. This approach reflects lot-to-lot variability, because a result reflects the production it was drawn from and a credential that never gets revisited cannot describe current production accurately.<\/p>\n<h3>What Happens If A Product Does Not Meet The WQI Standard?<\/h3>\n<p>A Standard Not Met outcome is private. It carries no public claim, no logo rights, and no registry listing, and it is never described as a failed product. The outcome may reflect insufficient data, inadequate contamination controls, an unsupported method, or incomplete scope rather than anything about the product itself. The company may submit corrected or additional information for future review, so participating in the review process carries no public downside risk.<\/p>\n<h3>Does WQI Verification Replace Legal Review?<\/h3>\n<p>WQI verification does not replace legal review. Companies remain responsible for ensuring all product, packaging, and marketing claims are accurate and properly substantiated. WQI verification is an independent review of a dataset against a defined standard. It is not legal, regulatory, or advertising-claims counsel, and it does not replace those functions. Brands should treat independent verification and legal review as complementary disciplines.<\/p>\n<h2>Conclusion: Why Defensible Plastic Reduction Claims Create More Value<\/h2>\n<p>A plastic reduction claim is indefensible without a documented evidence file that connects the claim to a defined baseline and a transparent calculation. That file must exist at the moment the claim is made, be bounded by what the measurement method can prove, and be assembled with the same rigor a retailer, regulator, or litigator would apply.<\/p>\n<p>Substantiating a plastic reduction claim is a documentation discipline. The five steps in this guide, from defining the claim precisely through understanding the measurement floor, give a practical process for turning existing data into a claim a brand can stand behind.<\/p>\n<p>The Wellness Quality Institute&#8217;s Plastic-Free Pathway Verification provides independent review that turns a company&#8217;s existing lab data into a supported claim, with approved language, a public registry listing, and a scope-locked verification decision grounded in published criteria. In a market where unverifiable claims are becoming a liability, a defensible claim becomes a strategic asset.<\/p>\n<p><a href=\"https:\/\/www.wellnessqualityinstitute.com\" class=\"solid-button\" target=\"_blank\">Turn your real lab data into a claim you can support. Talk to WQI.<\/a><\/p>\n<section data-read-next=\"true\">\n<h2>Read Next<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.wellnessqualityinstitute.com\/articles\/verify-plastic-reduction-claims\" target=\"_blank\">How to Verify Plastic Reduction Claims: A 5-Step Audit<\/a><\/li>\n<li><a href=\"https:\/\/www.wellnessqualityinstitute.com\/articles\/plastic-claim-substantiation-checklist\" target=\"_blank\">Plastic Claim Substantiation: The Evidence Checklist<\/a><\/li>\n<li><a href=\"https:\/\/www.wellnessqualityinstitute.com\/articles\/plastic-claim-substantiation-requirements\" target=\"_blank\">Plastic Claim Substantiation: Evidence Thresholds Under FTC<\/a><\/li>\n<li><a href=\"https:\/\/www.wellnessqualityinstitute.com\/articles\/third-party-verification-plastic-reduction\" target=\"_blank\">Third-Party Verification for Plastic Reduction Claims<\/a><\/li>\n<li><a href=\"https:\/\/www.wellnessqualityinstitute.com\/articles\/verification-programs-plastic-reduction-claims\" target=\"_blank\">Plastic Reduction Claim Verification: What US Brands Need<\/a><\/li>\n<\/ul>\n<\/section>\n","protected":false},"excerpt":{"rendered":"<p>Learn how to back plastic reduction claims with evidence. The Wellness Quality Institute verifies your substantiation file. Get certified today.<\/p>\n","protected":false},"author":118,"featured_media":357,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[3],"tags":[],"class_list":["post-358","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-certification"],"_links":{"self":[{"href":"https:\/\/www.wellnessqualityinstitute.com\/articles\/wp-json\/wp\/v2\/posts\/358","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wellnessqualityinstitute.com\/articles\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.wellnessqualityinstitute.com\/articles\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wellnessqualityinstitute.com\/articles\/wp-json\/wp\/v2\/comments?post=358"}],"version-history":[{"count":0,"href":"https:\/\/www.wellnessqualityinstitute.com\/articles\/wp-json\/wp\/v2\/posts\/358\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.wellnessqualityinstitute.com\/articles\/wp-json\/wp\/v2\/media\/357"}],"wp:attachment":[{"href":"https:\/\/www.wellnessqualityinstitute.com\/articles\/wp-json\/wp\/v2\/media?parent=358"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.wellnessqualityinstitute.com\/articles\/wp-json\/wp\/v2\/categories?post=358"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.wellnessqualityinstitute.com\/articles\/wp-json\/wp\/v2\/tags?post=358"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}