1.1 This specification establishes minimum characteristics for those factors that determine particle size, consistency, purity, and ability to drain. 1.2 Engineered wood fiber that meets the requirements of this specification must comply with Specification F 1292, if the surface is in the use zone as defined in Specification F 1487.1.3 A sample of wood fiber that meets the requirements of this specification may be designated engineered wood fiber and be suitable for playground s