FAQ
Plywood grading rules differ according to the country of origin. Most popular standard is the British Standard (BS) and American Standard (ASTM). The normal grading system uses the letters A, B, C & D, where A is the best quality, with virtually no blemishes and very well sanded. Grade D typically contains up to the maximum number of blemishes allowed. The letter grades typically come in pairs, where one letter refers to the "better" side, called the face, and the other letter to the back side, opposite the face. Russian (Baltic) plywood is generally manufactured according to GOST 3916.1-96. In this standard plywood is divided into 5 grades: E, I, II, III, IV. Grade correspondence applicable to Russian plywood: I = B, II = BB, III = CP, IV = C. E grade means Elite
The biggest difference between interior and exterior plywood is the method of construction. Both are comprised of three or more layers that are glued to each other. Either may be made of hardwood or soft, which refers to the type of tree it comes from, not the hardness of the wood. However, in interior plywood, water will cause the glue bonding the layers to come apart, which is called delamination. In contrast, exterior plywood uses glue that passes the boil test-immersion in boiling water for 24 to 72 hours without delamination
"MR" is the acronym of "Moisture Resistant". MR glued plywood means plywood resistant to moisture . The meaning of "MR" is different from that of "melamine" and "phenolic". "Melamine " or "phenolic" is the name of a specific glue . But like the word "WBP", " MR " is only a kind of property/feature of glue used in plywood production
The Forest Stewardship Council (FSC) is an international not for-profit, multi-stakeholder organization established in 1993 to promote environmentally sound, socially beneficial and economically prosperous management of the world's forests. Advantages of FSC-certified products are: Credibility (Anyone committed to responsible forest management can become a member of FSC); Environmental Protection (FSC's forest management standards expand protection of water quality, prohibit harvest of rare old-growth forest, prevent loss of natural forest cover and prohibit highly hazardous chemicals); Community Engagement (FSC requires forest managers to engage local community members and to protect customary rights of indigenous people); Access to Markets (Many major companies have policies that state a preference for FSC-certified products)
CARB (California Air Resources Board) is a department within the cabinet-level California Environmental Protection Agency. The stated goals of CARB include attaining and maintaining healthy air quality, protecting the public from exposure to toxic air contaminants and providing innovative approaches for complying with air pollution rules and regulations
