Specifier Briefing · Indoor Air Quality

Formaldehyde in Cork Flooring, What the EN 717-1 Test Actually Tells You

Specifiers writing for healthcare, education and WELL-rated workplaces ask the formaldehyde question early. The honest answer for cork is short. The why behind it is worth the rest of the page.

The short version

The cork ranges we supply test to E1 class, less than 0.05 ppm under EN 717-1, the European chamber test for formaldehyde emissions. That's an order of magnitude below the E1 threshold of 0.124 mg/m³ (0.1 ppm) and well inside the limits WELL, LEED v4.1, BREEAM Hea 02 and the German Blue Angel award require.For a specifier writing the indoor-air section of a tender, that single line covers the question. The rest of this article is for the projects where the IAQ consultant wants to see how the number is arrived at.

Why cork starts low, the material story

Most engineered floors carry formaldehyde because of the adhesives binding plywood, HDF or particleboard substrates, urea-formaldehyde and melamine-urea-formaldehyde resins are cheap and effective for that job. Cork doesn't use them.Cork plank is made of cork agglomerate, cork granulate from the bark of Quercus suber bonded together. The bond is a water-based polyurethane, formaldehyde-free by construction. The HDF carrier in Cork Styles is a low-emission grade also bonded with formaldehyde-free resins. The wear-layer finish is a UV-cured polyurethane, cured by light, not by formaldehyde release.The net result is a floor that doesn't have formaldehyde as a structural ingredient and therefore has very little to emit when the chamber test runs.

How EN 717-1 actually tests

EN 717-1 is the chamber method. A sample of the floor is conditioned in a controlled climate chamber at 23°C and 45 % relative humidity, with measured air exchange, and the chamber air is sampled until the formaldehyde concentration reaches steady state. The result is reported in ppm or mg/m³.

Class	Threshold	What it means
E0	≤ 0.04 ppm	"No added formaldehyde" tier, voluntary, varies by region
E1	≤ 0.1 ppm (0.124 mg/m³)	European regulatory minimum for indoor wood products
E2	≤ 0.3 ppm	Outdoor / non-residential only, not specified into UK interior schemes

The cork ranges we supply test at ≤ 0.05 ppm, that is, half of the E1 ceiling and within the stricter E0-equivalent tier on most regional definitions.

Where this lands in the WELL, BREEAM and LEED frameworks

What we issue on request

For projects targeting WELL, LEED, BREEAM Hea 02 or any healthcare / education spec, we issue per-project:

• EN 717-1 test certificate with the measured formaldehyde value
• Eco-Institut emissions certificate (independent third party)
• M1 emissions classification certificate
• Blue Angel award documentation (RAL-UZ 38)
• Type III EPD (ISO 14025) with full A1–A3 emissions inventory

Pack format is sized to drop straight into a WELL Material Library or BREEAM Hea 02 evidence folder. We've not had a formaldehyde challenge against a TFG-supplied cork floor on a certified scheme.

The tension to be honest about

Formaldehyde isn't the only IAQ concern in a finished floor. Solvents in adhesives applied on site, residual VOCs from the surface seal cure, and emissions from underlying substrates all contribute to the chamber the building manager actually breathes. The cork plank itself can be the cleanest part of that stack, but the install adhesive and the subfloor still need to be specified to the same tier. Where we supply cork into WELL-rated projects we issue an adhesive selection note alongside the floor TDS to keep the install chain consistent with the chamber-test number on the product.