Understanding Formaldehyde

What is formaldehyde?

Formaldehyde is a chemical made of hydrogen, oxygen, and carbon. It occurs naturally, and is the product of many natural processes. Formaldehyde is present in naturally high levels in many foods, including apples and onions; it’s even a natural building block in the human body. In fact, human blood normally contains about 3 ppm formaldehyde.

How much formaldehyde is in wood?

All wood species, and therefore all wood products, contain and emit small amounts of formaldehyde. Because formaldehyde occurs naturally in wood, there is no such thing as “formaldehyde-free” wood. An oak tree, for example, emits 0.009 parts per million (ppm) of formaldehyde. By itself, this is a very low quantity, but densely wooded areas can have much higher concentrations. It follows that any wood cut from that oak tree also contains small amounts of formaldehyde, as do all wood products.

Structural wood panels, such as oriented strand board, are manufactured with moisture resistant adhesives and the finished product emissions are similar to raw wood.

What kind of resin is used in Tolko T-STRAND OSB?

Tolko OSB is manufactured using low-emitting resins in compliance with the PS 2 Performance Standard. Tolko OSB contains no added ureaformaldehyde resin.

APA qualified structural panels with low formaldehyde emissions

Panels labeled as G5 have qualified for low formaldehyde emissions based on ISO 12460-4 and the bond performance requirements of PS 2. The G5 rating is a formaldehyde upper emission level defined as: average 0.20 mg/, individual specimen 0.30 mg/ APA Testing has shown that APA certified products that meet these G5 levels and the most stringent level specified in CARB and HUD.

PS 2 Certified OSB

Tolko oriented strand board (OSB) is manufactured to meet the stringent Voluntary Product Standard (PS 2), Performance Standard for Wood-Based Structural-Use Panels. Under these standards, panels are manufactured only with moisture-resistant adhesives that meet Exterior or Exposure 1 bond classifications.
Tolko’s adhesives, typically phenol formaldehyde and diphenylmethane diisocyanate (MDI), chemically react into stable bonds during pressing. The final products have such low formaldehyde emission levels that they easily meet or are exempt from the world’s leading formaldehyde emission standards and regulations.

Ps 2 Osb Compared To Worldwide Formaldehyde Standards