CARB 2 Compliant Cabinets: Formaldehyde Rules Explained

CARB 2 compliant cabinets are built from hardwood plywood, particleboard and MDF made to California's Phase 2 formaldehyde emission limits (0.05 ppm for hardwood plywood, 0.09 for particleboard, 0.11 for MDF and 0.13 for thin MDF), from panel mills certified by an approved third-party certifier. Since June 1, 2018 the same numbers have been federal law under EPA's TSCA Title VI rule, and products made or imported after March 22, 2019 must be labeled "TSCA Title VI compliant." So any cabinet with those panels legally sold in the US today meets them. The rest of this page covers what the ppm figure measures, which cabinet parts the rule doesn't touch, how to read the label, and how to keep a new kitchen's air as clean as possible.

We sell cabinets for a living, and we get this question two ways. Homeowners ask whether the boxes are "safe." Contractors ask for paperwork a submittal reviewer will accept. Both answers come from the same regulations, which we've read so you don't have to.

Key Takeaways

• CARB Phase 2 (California) and TSCA Title VI (federal, since June 1, 2018) set identical limits: 0.05 ppm hardwood plywood, 0.09 particleboard, 0.11 MDF, 0.13 thin MDF.
• Since March 22, 2019, regulated products must carry TSCA Title VI wording; the CARB label alone no longer satisfies the federal rule.
• The rule covers only those three panel types. Solid wood, hardboard, paint, topcoats and glue lines outside the panels are not covered.
• Every cabinet legally sold in the US meets the same floor, so "CARB2" is no longer a differentiator. NAF or ULEF panels, a plywood box, and a whole-product certification are what go beyond it.
• A new kitchen still benefits from airing out: ventilate, keep heat and humidity down, and run the range hood for the first few weeks.

From a California Rule to a Federal Law

Formaldehyde is a building block of the urea- and melamine-formaldehyde resins that glue wood particles and fibers into panels. A small fraction that never fully reacts, or that is released as the resin slowly breaks down with heat and humidity, escapes into the air. Regulating that release happened in three steps.

In 1985 HUD set limits for plywood (0.2 ppm) and particleboard (0.3 ppm) in manufactured homes only. On April 26, 2007 the California Air Resources Board adopted its Airborne Toxic Control Measure for composite wood products (17 CCR 93120), with two phases of limits, mandatory third-party certification of panel mills, and coverage of finished goods such as cabinets sold in California. National manufacturers didn't want a separate California line, so Phase 2 panels became the industry default and "CARB2" became the shorthand. Then Congress passed the Formaldehyde Standards for Composite Wood Products Act in 2010, adding Title VI to TSCA, and EPA finalized its rule (40 CFR Part 770) in December 2016 with the same limits as Phase 2.

The upshot: an older spec sheet may use the California wording and a newer one the federal wording. They refer to the same ceilings; what changed in 2019 was the label language, not the limit (EPA).

The Numbers: Phase 1, Phase 2 and Title VI

These are the limits as they appear in Table 1 of CARB's final regulation order (CARB ATCM) and in 40 CFR 770.10. Thin MDF is 8 mm (0.315 inch) thick or less.

Phase 2 roughly halved Phase 1, and the federal column is simply Phase 2 adopted verbatim. The limits also differ by panel: plywood has the tightest ceiling and MDF the loosest, which is why a chemically sensitive household has a real, if modest, reason to prefer a plywood box. Our furniture board vs plywood guide covers the strength and moisture side of that choice. For conversions, 1 ppm of formaldehyde is about 1.23 mg/m³ at 25 °C, so 0.05 ppm is roughly 0.06 mg/m³ and 0.09 ppm roughly 0.11 mg/m³.

What the ppm Figure Actually Measures

The limit isn't a reading taken in anyone's kitchen. It's the formaldehyde concentration in a sealed test chamber holding a set amount of bare panel. The reference method in the federal rule is ASTM E1333, a large chamber held at 25 °C (77 °F) and 50 percent relative humidity, with half an air change per hour and a set panel loading per cubic meter of chamber. Mills also run faster small-chamber and daily quality-control tests correlated to the big chamber, and a third-party certifier audits the whole system.

Real cabinets differ from the chamber in ways that mostly push emissions down:

• Most panel surface is sealed. Box sides are faced with melamine, veneer or a UV coating; doors are painted; edges are banded. Facing slows the escape of gas compared with the bare board the chamber tests.
• Mills run with margin. A mill averaging right at the limit would fail its own quality control constantly. (We won't quote a figure for any brand without its test data.)
• Emissions fall with age. Release is highest when a product is new and declines over the following weeks and months.

A real kitchen can also be worse: a hot, humid summer with the windows shut, a tightly sealed new house, and new flooring, furniture and paint arriving at once. Heat and humidity both raise formaldehyde release from resin-bonded wood. The chamber number is a fair way to rank and police panels, not a prediction of your air.

Which Parts of a Cabinet the Rule Covers

Title VI regulates three product families, hardwood plywood, particleboard and MDF, wherever they go: as a raw sheet, as a component such as a door blank, or inside a finished good such as a cabinet. Everything else is outside it.

Laminated products. Many cabinet makers press decorative veneer onto a plain core themselves. Before 2024 that shop only had to buy certified cores. Since March 22, 2024 EPA treats a laminated product producer as a hardwood plywood producer, so its veneered panels need their own certification unless the veneer is attached with a phenol-formaldehyde or no-added-formaldehyde resin.

The finish. Painted and stained cabinet doors are often sealed with a catalyzed conversion varnish. A 1998 study by EPA researchers in the Journal of the Air & Waste Management Association found three commercial conversion varnishes emitted 2.3 to 8.1 times the free formaldehyde applied, and one was still emitting 115 days after application. Formulations have changed since, and much of the curing happens in factory ovens, but the composite wood rule says nothing about coatings. Ask separately if it matters to you. For how different door skins compare, see our guides to melamine cabinets, thermofoil cabinets and HDF and MDF doors.

NAF and ULEF: The Low-Emission Tiers Above the Floor

Phase 2 is a ceiling, not a target. The rule recognizes two better-performing categories, and a manufacturer using them has something real to tell you.

NAF (no-added formaldehyde) panels use a resin with no formaldehyde in its cross-linking structure, such as soy-based or isocyanate (MDI) binders. "No added" isn't zero, because wood itself releases trace formaldehyde. To qualify, 90 percent of three months of quality-control results must be at or below 0.04 ppm, with no single result above 0.05 ppm for plywood or 0.06 for particleboard and MDF (40 CFR 770.17).

ULEF (ultra-low-emitting formaldehyde) resins still contain formaldehyde but emit well under Phase 2. There are two tiers (40 CFR 770.18):

Look at the plywood column: its Phase 2 ceiling is already where the strict tiers land. The gains from NAF and ULEF are biggest for particleboard and MDF, where the step from 0.09 or 0.11 down to 0.06 is substantial. A furniture-board box made from documented NAF or ULEF board closes most of the gap to plywood.

Reading the Label

There are two labels in this system, and people confuse them.

The panel label (40 CFR 770.45) carries the panel producer's name, lot number, the EPA-recognized third-party certifier's number and a TSCA Title VI certified statement. You'll rarely see it on a cabinet, because the sheet was cut up long before it became a box.

The finished-goods label is the one that matters to you. It must show the fabricator's name, the month and year the product was made, and a statement that it is TSCA Title VI compliant, on each finished good or on every box or bundle containing them. Goods whose regulated wood content is 144 square inches or less (by largest face) are de minimis, which applies to a trim piece, not a cabinet.

On most boxed cabinets the label sits on the carton or inside the box side or back, next to the production sticker. If you're assembling RTA cabinets, check the carton before you recycle it; it's often the only copy.

What "CARB2 Compliant" Does and Doesn't Promise

Since 2018 the phrase has stopped being a differentiator. What still separates products is whether the claim is documented, whether the panels beat the floor (NAF or ULEF), what the finish is, and how well the box is built. For the build side, see how to tell quality kitchen cabinets.

You may also see a California Proposition 65 warning on fully compliant cabinets. That isn't a contradiction: Prop 65 requires a warning for possible exposure to listed chemicals, and formaldehyde and wood dust are on the list. The warning and the emissions certification answer different legal questions.

E1, E0, F4-Star and GREENGUARD

Imported and European-style lines use a different alphabet. Each uses its own test method, so none converts exactly.

Two takeaways: an E1 sticker isn't the US requirement, so ask for the Title VI statement; and if you want a claim about the finished cabinet, finish and all, a whole-product certification such as GREENGUARD Gold is the document to ask for. Most cabinet spec sheets stop at Title VI.

KCMA is a different thing. KCMA certification tests structure and finish durability to ANSI/KCMA A161.1 and says nothing about formaldehyde. KCMA's separate Environmental Stewardship Program requires at least 70 points across five categories, air quality among them, and is verified by documentation.

What Each Line We Sell States in Writing

We repeat only what a manufacturer publishes or what we have on file. Every line below is sold in the US and must meet Title VI regardless; the table is about what each documents.

If you're choosing between a plywood and a particleboard box mainly on emissions, the regulation's own ceilings of 0.05 versus 0.09 ppm are the honest measure of the difference. Budget boxes are covered in our guide to builder grade cabinets.

How to Verify Compliance Before You Order

1. Get it in writing. The spec book should name Title VI or CARB Phase 2; our spec book library has the documents we hold.
2. Ask which panels are in the box, door and drawer: plywood, particleboard, MDF, HDF or hardboard.
3. Ask whether any panels are NAF or ULEF.
4. Ask what the finish is and whether any whole-product certification exists.
5. Check the label on delivery: fabricator, month and year, "TSCA Title VI compliant." Photograph one carton per shipment.
6. For imports, ask who certifies. EPA publishes the list of recognized third-party certifiers, so you can check the name.
7. Keep the file with your warranty paperwork.

Contractors can fold this straight into a submittal; our multi-family supplier guide covers which certifications belong in the spec.

An Indoor-Air Plan for a New Kitchen

What happens in your house depends as much on the first few weeks as on the product. CARB's consumer guidance says formaldehyde can irritate the eyes, nose and throat and trigger asthma symptoms, that it is a known human carcinogen, and that ventilation and lower temperature and humidity reduce what reaches the air. The limits cut emissions substantially; a new room still benefits from airing out.

If anyone in the house has asthma or chemical sensitivity, plan the materials rather than relying on airing out: a plywood box, NAF or ULEF panels if available, questions about the finish, and, if you want a number, a lab-analyzed formaldehyde test a month after installation (cheap electronic meters are often unreliable for formaldehyde). Sizing a hood? Start with our range hood CFM guide.

Frequently Asked Questions

What does CARB2 compliant mean on kitchen cabinets?

The hardwood plywood, particleboard and MDF in the cabinet meet California's Phase 2 formaldehyde limits (0.05, 0.09 and 0.11 ppm, 0.13 for thin MDF), certified by an approved third-party certifier. The same limits have been federal law under TSCA Title VI since June 1, 2018.

Are CARB2 and TSCA Title VI the same thing?

The limits are identical. The difference is jurisdiction and labeling: CARB's rule applies in California, Title VI nationwide, and products made or imported after March 22, 2019 must be labeled TSCA Title VI compliant.

Are all cabinets sold in the US required to be compliant?

Yes, if they contain hardwood plywood, particleboard or MDF and were made in or imported into the US on or after June 1, 2018. Cabinets built entirely of solid wood and exempt materials fall outside the rule.

Are CARB2 cabinets formaldehyde-free?

No. The limits are ceilings, not zero, and wood itself contains trace formaldehyde. NAF panels come closest. CARB notes NAF and ULEF products may simply be labeled Phase 2 compliant, so ask if it matters.

Is plywood lower-emitting than particleboard or MDF?

By regulation, yes: 0.05 ppm against 0.09 for particleboard and 0.11 for MDF. The gap narrows when board is made with NAF or ULEF resin (about 0.06 ppm) and when panels are fully faced and edge-banded.

Does the rule cover cabinet paint and finishes?

No. It covers only the three composite panel types. Coatings, including conversion varnishes, fall outside it; ask the manufacturer about the finish and any whole-product certification.

Where is the formaldehyde label on a cabinet?

Usually on the shipping carton or inside the box side or back. It should show the fabricator's name, the month and year made, and "TSCA Title VI compliant."

How long do new cabinets off-gas?

Emissions are highest when a product is new and decline over the following weeks and months, faster with good ventilation and lower heat and humidity. Finishes can take longer; ventilation matters most in the first weeks.

Get the Paperwork With Your Quote

If emissions are part of your decision, tell us at the start. We'll quote the lines that fit your budget, say which box material each uses, and request the manufacturer's written emissions statement wherever one exists. Send your measurements to our free 3D design service: a designer replies within two business days, and the 3D design and itemized quote follow within 24–48 hours. Or contact us or call 609-900-3358 and ask for the emissions documentation on any line we carry.