Jul 30, 2009. /Lesprom Network/. North American producer of particleboard and MDF SierraPine has introduced Encore FR – a Class 1 (A) certified, no added urea formaldehyde (NAUF) particleboard, WBPI reported. According to the company, Encore FR is the newest addition to a line of Sustainable Design Particleboard products which include Encore and Encore MR. Encore FT is designed specifically for green building and other environmentally sensitive applications where fire safety is a concern and where local, state or federal fire code regulations must be met. Encore FR is produced with a non-borate flame retardant system which expands lamination and coating options. In addition, the product is said to be engineered with superior physical properties to other comparable products.