Patent ID: 9669564
Date: 2017-06-06
CPC Classifications: B05D,B27K,C08K,C09D,C09K,Y10T

Claim:
1. A method of treating plywood or oriented strand board (OSB) comprising the steps of: applying an aqueous fire-retardant impregnate to a wood product consisting of plywood or OSB with a thickness of up to approximately ¾ inch, such that the impregnate penetrates the wood product; and applying a coating to the wood product surface; wherein said treatment confers fire retardancy to the treated wood product such that the treated wood product exhibits a flame spread distance of not more than 6 feet in an ASTM E-84 30-minute burn test; wherein said fire retardant impregnate is applied by pressure or vacuum treatment, or both, or microwave treatment.