Engineered Wood Fiber from webuildfun, inc., contains 100% virgin softwoods and/or hardwoods, consisting of randomly sized wood fibers, the majority of which do not exceed 1.5" in length, and contain 10% to 20% fines to aid in compaction and cohesion. The product we supply is certified by IPEMA to ASTM standards F1232 and F2075. Certificates of compliance are available at www.ipema.org. Wood Fiber product intended for playgrounds must certify non-toxic and cannot contain any recycled wood material, pallets, or any wood contaminated with paint, chemicals, preservatives or additives. The Wood Fiber must contain minimal bark and be free of twigs, leaf debris or any other organic materials, and must certify as non-flammable.