What CARB P2 actually requires from your supplier
What CARB Phase 2 covers and which products fall inside its scope
CARB Phase 2 is the California Air Resources Board regulation that limits formaldehyde emissions from composite wood products sold, offered for sale, manufactured or imported into California. The regulated product categories are hardwood plywood, particleboard, medium-density fiberboard and thin medium-density fiberboard. The rule applies to the panel and to finished goods that contain those panels, which means a piece of furniture is in scope even if the panel was produced outside California and assembled elsewhere.
The scope follows the panel, not the retailer. A factory in another country that produces panels or finished goods destined for California becomes part of the compliance chain, and it must either meet the standard itself or buy compliant panels from a supplier that does. The obligation does not disappear because the finished product is assembled from components sourced from several suppliers, or because the importer never takes physical possession of the panel.
Products outside the scope include solid wood, metal, glass, and composite panels that fall outside the defined categories, although some products that contain a regulated panel in a small proportion still require careful review. The practical test is whether the finished good contains hardwood plywood, particleboard or MDF that was manufactured with a resin that can emit formaldehyde. If it does, the compliance file has to follow the panel through the supply chain to the finished good.
Emission limits by product class and the finished-good distinction
The Phase 2 limits are expressed as formaldehyde emissions measured by the relevant ASTM test method. Hardwood plywood is limited to 0.05 parts per million, particleboard to 0.09 ppm, medium-density fiberboard to 0.11 ppm and thin medium-density fiberboard to 0.13 ppm. These are the values most buyers recognize, and they apply to the panel as produced, tested after the appropriate conditioning period.
The finished-good distinction is where most confusion arises. The panel producer certifies the panel against the panel limit. The furniture factory that assembles the panel into a finished good does not re-certify the panel, but it does have to demonstrate that it used compliant panels and that it can trace them. If the factory laminates, coats or otherwise processes the panel, the compliance documentation still has to identify the original panel and its certification.
There is also a distinction between the emission limit and the formaldehyde content of the resin. A panel can contain a resin with a measurable formaldehyde content and still pass the emission test, because the test measures what is released under specified conditions rather than what is present in the product. Buyers should specify the emission limit and the test method, not the resin chemistry, unless there is a separate reason to restrict the chemistry.
Third-party certification: what the producer certifies and what the factory keeps
The panel producer is responsible for obtaining third-party certification through a CARB-approved certification body, and for labeling the panel with the certification information. The certifying body audits the producer process, reviews the test data and issues the certification that supports the label. The producer is the entity that holds the certification, and the label is tied to the panel rather than to the finished product.
The furniture factory keeps the documentation that connects the finished good to the certified panel. That includes the purchase records, the panel labels or their recorded equivalents, the supplier certification number, the production records that show which panels went into which finished goods, and the records that show the finished goods were shipped to California. The factory is not required to run its own emission test if it is using certified panels, but it is required to be able to demonstrate the chain.
Importers and retailers add a layer of documentation. The retailer may require a compliance statement from the importer, and the importer may require the factory to provide the certification records and the traceability data. The practical result is a documentation chain that runs from the panel producer through the factory to the importer, with each party holding the records that cover its own step. A missing link in that chain is the most common reason a shipment is held or a retail program is delayed.
Chamber testing methods and how long results stay valid
Formaldehyde emissions are measured in a chamber test, most commonly the large chamber method described in ASTM E1333 for the primary certification test, and the smaller chamber method described in ASTM D6007 for quality-control testing. The chamber controls temperature, relative humidity and air exchange rate, and the formaldehyde concentration is measured after a defined conditioning period. The result is expressed in parts per million under those conditions, and results from different methods are not directly interchangeable.
Test results are tied to a production period and a product type, not to an unlimited future. A certification is maintained through ongoing quality control, which includes quarterly testing for most product categories, plus process monitoring. If a producer changes resin, press conditions or raw material, the certification body is notified and the test program is adjusted. A test report from several years ago without current quality-control records is not evidence that today panel meets the limit.
The factory should verify that the certification is current at the time of purchase, and that the product type on the certificate matches the panel being supplied. A certificate for particleboard does not cover MDF, and a certificate for one thickness range may not cover another. Where a supplier cannot produce current certification, the buyer should treat the panel as unverified, regardless of what the invoice says.
The documentation binders US customs and retailers expect
A practical compliance binder contains the panel producer certification, the panel labels with the certification number, the purchase orders and invoices that connect the panels to the factory, the production and shipping records that connect the factory to the importer, and a clear statement of which finished goods were shipped to California. The binder should be organized by finished-good SKU and by production period, because that is how an inquiry is usually framed.
Retailers often add their own requirements, including a compliance statement signed by an authorized factory representative, a declaration that the panels used meet the applicable limits, and a commitment to notify the retailer if the panel source changes. Some retailers also require the factory certification number to appear on the purchase order or on the carton label. The requirements vary by retailer, and the factory should confirm them in writing before production rather than after shipment.
The binder is not a one-time document. It should be updated when the panel source changes, when a new SKU is added, and when the certification is renewed. A digital copy with a clear file naming scheme and a version date is easier to maintain than a physical binder, and it allows a factory to respond to a retail inquiry within a day rather than a week.
How TSCA Title VI interacts with CARB for US importers
TSCA Title VI is the federal formaldehyde emission standard, and it is closely aligned with CARB Phase 2. It applies to composite wood products imported into the United States, and it requires that regulated panels be certified by an EPA-recognized third-party certifier. For most products, a panel that meets TSCA Title VI also meets CARB Phase 2, but the two programs have separate documentation and labeling requirements, and the importer has to be able to show compliance with both where applicable.
The practical effect for an importer is that the compliance file should be built to satisfy the stricter of the two requirements and should include the certification that covers the destination market. A shipment moving to California needs the CARB documentation, and the same shipment moving to another US state needs the TSCA documentation. A single panel certification from a recognized certifier can often support both, but the importer should confirm that the certifier is recognized for the relevant program.
The records should be retained for at least three years, and longer is better. The importer should also have a process for handling a supplier change, because a new panel source means new certification records and potentially new labels. The most common compliance failure is not a panel that exceeds the limit; it is a documentation chain that cannot be reconstructed when an inquiry arrives months after the shipment.