EPA Updates Formaldehyde Test Standards for Composite Wood Products: What Changes on November 27

On October 28, 2026, EPA published a final rule that updates the industry standards built into its formaldehyde rule for composite wood products (40 CFR part 770, under Title VI of the Toxic Substances Control Act). The changes take effect on November 27, 2026.

This is a housekeeping rule, not a new emission limit. EPA calls it "a routine action" and says it anticipates no additional costs. But if you make, fabricate, import, test, or certify hardwood plywood, medium-density fiberboard (MDF), or particleboard, the rule changes which editions of the test methods and product standards you are expected to follow. That is worth a quick check of your quality and supplier paperwork before the effective date.

Who this applies to

EPA says you may be affected if you manufacture (including import), sell, supply, or offer for sale in the United States hardwood plywood, MDF, particleboard, or products that contain them. Testing labs and companies that work with third-party certifiers (TPCs) are also in scope.

The rule's list of potentially affected industries includes:

• Veneer, plywood, and engineered wood product manufacturing
• Furniture and related product manufacturing, plus furniture wholesalers and stores
• Manufactured home and prefabricated wood building manufacturing
• Motor home, travel trailer, and camper manufacturing, plus RV dealers and wholesalers
• Lumber, plywood, millwork, and wood panel wholesalers, and building material dealers
• Engineering services and testing laboratories

If you run a cabinet shop, millwork operation, or any line that cuts and assembles composite panels into finished goods, you are likely a "fabricator" under the rule. Most of the technical changes land on panel producers, labs, and TPCs, but your supply chain documents will start to reference the new editions.

What EPA changed

The final rule does four things.

1. Updates six incorporated standards to current editions.

Regulated entities must use the updated editions when complying with part 770:

• ANSI A190.1-2022, structural glued laminated timber (was the 2017 edition)
• ASTM D5582-22, desiccator test method (was D5582-14)
• ASTM D6007-22, small-scale chamber test method (was D6007-14)
• ASTM E1333-22, large chamber test method (was E1333-14)
• ISO 12460-3:2023(E), gas analysis method (was the 2020 edition)
• PS 1-22, structural plywood (was PS 1-19)

2. Adds a new optional quality control test method.

ISO 12460-2:2024(en), a small-scale chamber method, becomes an allowed quality control method under 40 CFR 770.20(b)(1) on November 27, 2026. EPA says this gives producers more flexibility, including analytical methods such as laser absorption spectroscopy, and lines the federal rule up with the California Air Resources Board's formaldehyde rule (the CARB ATCM), which recently accepted the same method.

3. Removes a duplicate standard.

EPA dropped BS EN ISO 12460-3:2020, the British version of the gas analysis method. The identical international method, ISO 12460-3, is updated in the rule to the 2023 edition, so the same procedure is still available.

4. Conforms the scope and definitions.

Sections 770.1 and 770.3 are updated to point to the new editions. The amendatory text also updates edition references in other sections of part 770, including 770.7, 770.15, 770.17, 770.18, and 770.20. Starting November 27, the emission standards in 770.10(b) are stated as based on ASTM E1333-22; the rule republishes only the introductory text of that paragraph, not the emission limits themselves.

Is there a transition period?

No separate one. Commenters asked EPA for a transition timeline. EPA declined to add one beyond the 30 days between publication and the effective date. EPA's reasoning is that the updated editions are technically consistent with the old ones and are not expected to affect compliance determinations or implementation, and that the new ISO method is optional.

EPA also said that in future updates where a new edition makes substantive changes (for example to procedures, calculations, or apparatus), it intends to evaluate and, as appropriate, propose defined transition provisions.

A note on "significant change" and correlation

Several commenters asked EPA to define "significant change," the term in 40 CFR 770.20(d) that can require a lab or mill to redemonstrate equivalence or correlation between test methods. EPA did not add a definition. It said the term is not new and that, generally, a significant change may be any change in equipment, procedure, or testing personnel qualifications that a technically competent person would expect to alter the established statistical relationship between test methods. EPA pointed to its Frequent Questions page and said it may publish more examples later.

If your mill adds the new ISO 12460-2:2024(en) method, EPA says it is subject to the same correlation requirements as every other quality control method, so a correlation to the large chamber method (or an equivalent small chamber) must be demonstrated under 40 CFR 770.20(d)(2) before you rely on it. If you change chamber equipment, procedures, or testing staff as part of this update, document whether that counts as a significant change that requires a new equivalence or correlation demonstration.

What to do before November 27

• Panel producers and labs: update quality control procedures and test records to cite the current editions, and decide whether the new ISO 12460-2:2024(en) method is worth adopting.
• Anyone using the BS EN ISO 12460-3 method: switch references to ISO 12460-3:2023. EPA says it is the same procedure.
• Fabricators, importers, and distributors: confirm your panel suppliers and their TPCs are aligned with the updated standards, and keep certification and supplier documents current in your records.
• Everyone: remember the labeling rules have not gone away. As EPA recaps in this rule, its 2019 amendments clarified that regulated composite wood products and finished goods containing them must be labeled at the point of manufacture or fabrication, and imported products must be labeled as a condition of importation.

The bottom line

This rule will not change much on the shop floor, and EPA does not expect it to cost anything. It does mean the standards your QC program, test reports, and supplier certificates rely on are changing editions on November 27, 2026. A short documentation review now is cheaper than sorting out mismatched references during an audit or a customer review.

This post is general information, not legal advice. For questions about how the rule applies to your products, EPA lists technical and TSCA Hotline contacts in the rule.

Need help reviewing your formaldehyde compliance records, supplier documentation, or broader EHS program? Contact Provisio EHS at 385-316-2837.

Sources

All retrieved Oct. 29, 2026.

• EPA final rule, Voluntary Consensus Standards Update; Formaldehyde Emission Standards for Composite Wood Products, 91 FR 67771 (Oct. 28, 2026)
• Same rule, GPO PDF
• Federal Register API record (effective Nov. 27, 2026)
• EPA, Frequent Questions for Regulated Stakeholders about Implementing Formaldehyde Standards