Formaldehyde is used in glue in the manufacture of wood based panels including plywood, particle board and MDF. It is used for the formulation of wood-based panel adhesives and very hard to substitute. Formaldehyde release is very high in newly manufactured plywood. So it is important to control the quality of glue used for plywood.
European Standards for Formaldehyde
|Formaldehyde Emission Grade||Formaldehyde Emission Level|
|E0 Grade (Not Existing in the Standard)||≤0.5mg/L|
|E2 Grade (Banned in China)||≤5.0mg/L|
|JAS F4 Star (Japan)||≤0.3mg/L|
Emission classes E1 and E2 were created by European Standard EN 13986 for use in construction where formaldehyde-containing resins have been added to the product. The product ought to be tested and classified into one of two classes: E1 and E2. The test requirement does not apply to wood-based panels to which no formaldehyde containing materials were added during production. They may be classified E1 without testing.
Looking for E0 plywood from China? There is no official standard of E0 plywood but Chinese plywood manufacturers do make low formaldehyde plywood for certain uses. There is no formaldehyde-free plywood. There are no-added formaldehyde (NAF) and ultra-low emitting formaldehyde-based resins (ULEF), to encourage the use of these lower-emitting resins in composite wood products.
Formaldehyde Testing Methods
- Chamber method EN 717-1 with 3 volume options
- Perforator method EN 120
- Gas analysis method EN 717-2
- Flask method EN 717-3
Glue Types Used in Plywood
Formaldehyde-based adhesives for wood-based panels are UF and MUF resins and to a lower extend PF resins. Formaldehyde-free plywood is made with pMDI. For the next years, conventional adhesives with reduced or no formaldehyde emissions will maintain their dominating position. The importance of alternative resins will increase but on a lower level as often proposed.
How to Reduce the Formaldehye in Your Room?
Use Low-Formaldehyde Plywood
Choose E1 or E0 grade plywood for your flooring, cabinets and furniture. Test the plywood if you have doubts about the quality of the material used in your decoration.
Use Less Engineered Panels
Solid timber is better than engineered panels. Timber is extra low in formaldehyde compared with the plywood. Using a lot of E1 grade plywood won’t help with the situation. Too much engineered wood in a room still release a lot of formaldehyde.
Seal The Plywood
Make the plywood laminated or coated. You may use a vapor barrier such as some paints, varnishes, or a layer of vinyl or polyurethane-like materials. Be sure to seal with a material that does not contain formaldehyde.