E0 vs E1 vs CARB P2: Which Panel Grade Do You Actually Need?
Every week a buyer sends me a quotation with "E0 board" written in the spec column, and asks me to confirm the price. Half the time, E0 is not what their market requires, and the other half, the report they were shown does not actually cover the board they are buying.
This is not a small detail. Formaldehyde emission is the one panel property that can stop a container at the border, get a product pulled from a retail listing, or turn a profitable order into a recall. It is also the property most often "confirmed" with a screenshot.
Here is what the three codes actually mean, which one applies to you, and how to check a report before you pay a deposit.
1. What each code actually measures
All three limit how much formaldehyde a board releases into the air, but they use different test methods, different units and different limits. That is why comparing them line by line is misleading.
| Code | Where it applies | Method | Limit |
|---|---|---|---|
| E1 | China (GB 18580-2017), also EU (EN 717-1) | 1 m³ chamber | ≤ 0.124 mg/m³ |
| E0 | China voluntary grade (GB/T 39600-2021) | 1 m³ chamber | ≤ 0.050 mg/m³ |
| ENF | China voluntary, highest class | 1 m³ chamber | ≤ 0.025 mg/m³ |
| CARB P2 / TSCA Title VI | United States (federal) | Large chamber, ppm | MDF 0.11 · Particleboard 0.09 · Thin MDF 0.13 · Hardwood plywood 0.05 ppm |
| F☆☆☆☆ | Japan | Desiccator | ≤ 0.3 mg/L |
Two things worth noticing. First, E1 in China and E1 in Europe are numerically the same limit — 0.124 mg/m³ — which makes E1 the one grade you can safely carry across markets. Second, CARB P2 is not stricter than E0. Converting 0.11 ppm gives roughly 0.135 mg/m³, which sits near E1. Buyers who ask for "CARB P2 or E0, whichever is better" are asking for two different things.
If a supplier says "this board is E0 and CARB P2 certified", ask for two separate reports. They use different test methods, so one document cannot prove both.
2. Which grade your market actually requires
The same board can be fully compliant in one market and unsellable in another, because each market asks for a different certificate — not a different number.
| Market | Legal requirement | What proves it | The trap |
|---|---|---|---|
| EU & UK | E1, tested to EN 717-1, with CE marking under EN 13986 | EN 717-1 chamber report + Declaration of Performance | There is no official E0 class in Europe — "E0" on a European offer is a Chinese grade, not an EN standard |
| United States | TSCA Title VI (functionally CARB Phase 2) | Third-party certification (TPC) from an approved certifier + correct panel labelling | A Chinese lab report on its own does not satisfy a customs inquiry |
| China (domestic) | E1 under GB 18580-2017 | CNAS or CMA accredited report | E0 and ENF are voluntary upgrades, not legal grades — and the wording leaks into export offers where it means nothing |
| Middle East, SEA, Australia | Usually no single statutory limit | Your own written spec (e.g. "E1 or better, report within 12 months"); AS/NZS 4266 data for Australia | "Good quality board" is not a testable requirement |
Read the table this way: in Europe you are buying a test method, in America a certification chain, in China a domestic grade. Only the third column closes the deal.
3. Three traps behind "E0 certified"
Trap one: a report for a different board
Emission results are tied to a specific product, thickness and factory. A 25 mm E0 report does not cover the 18 mm board in your order, and a report from factory A does not cover factory B — even when both belong to the same group. In seven years I have seen the same PDF forwarded across four different suppliers.
Trap two: an expired or non-accredited report
Formaldehyde reports are a snapshot. Resin formulations change, suppliers change, and a three-year-old report tells you what a factory could do in 2023. Check the date, and check for a CNAS or CMA mark — without accreditation, the document is a printout, not evidence.
Trap three: confusing FSC with emissions
FSC certifies where the wood fibre comes from. It says nothing about formaldehyde. Buyers regularly accept an FSC certificate as proof of low emission, which is a category error — and one that shows up in retail compliance audits.
4. How to verify a report in 60 seconds
When a report lands in your inbox, run this checklist before you read the number:
| Check | It must show | Reject if |
|---|---|---|
| Product & thickness | Exactly the board and thickness on your order line | It covers a different thickness or grade |
| Factory name | The factory on the proforma invoice | It names a trading company instead |
| Test date | Within 12 months | Older, or no date visible |
| Method | "1 m³ chamber method" for E1 / E0; large chamber for CARB | Method is not stated |
| Result vs limit | The measured value, not only the word "Pass" | Only a pass/fail stamp |
| Accreditation | CNAS or CMA mark, plus a queryable report number | No mark, no number |
| Page count | Sample description page and test-condition page | A two-page PDF (usually a summary) |
If any of these fail, do not negotiate on price — ask for a new test. It typically costs a few hundred RMB per sample and takes about a week, which is cheaper than a rejected container.
5. What to write in your purchase order
This is the part that prevents 90% of disputes. Put it in the PO, not in WeChat:
| Clause | Wording to put in the purchase order |
|---|---|
| Grade & standard | "Formaldehyde emission: E1, tested to GB 18580-2017 / EN 717-1, 1 m³ chamber method." |
| Report requirement | "Valid test report (issued within 12 months) covering the exact product and thickness supplied, from a CNAS-accredited laboratory, provided before shipment." |
| Sampling | "Shipment sampling per batch; buyer may nominate a third-party inspection at buyer's cost." |
| Remedy | "Non-conforming emission results entitle buyer to rejection and full refund of deposit." |
Four lines. They cost you nothing and change how the factory treats your order, because they signal that someone will actually check.
What about the price difference?
Between E1 and E0, expect roughly 3–8% on the board cost, depending on board type and thickness. ENF can push higher. If your market only requires E1, paying for ENF is money spent on a claim nobody will ask you for. If you sell into a market where retailers audit emission data — Germany, California, parts of Australia — the upgrade is cheap insurance.
The decision is not "which is the best board". It is "which standard will my customer's compliance team ask me to prove".
I can send you a spec sheet template that states grade, tolerance, density and test requirements in the form factories actually quote against — so offers become comparable. Request a quote or message me on WhatsApp.
3 years studying international trade in the UK · 5 years running international projects · 7 years in China's furniture and panel export. I help importers specify, verify and ship — from the factory floor, in your language.