Polyester Roof insulation batts meets the following standards: AS/NZS 4859.1:2002 - Materials for the thermal insulation of buildings . Details: 1.The Products made from 100% polyester recycle fiber,enviroment-friendly 2.Execllent thermal insulation ,save energy. 3.The batts is easily be cut by normal knife. 4.Non-toxic,non-irritating,non-allegenic and safe for anyone coming into contact with it. 5.Flame retardant,pass BS5852 6.Low desity,only 10kg/m3. 7.Safty for healthy, not like glass fiber. 8.Can be used on roof, also can be used in wall. R value 2.5-6.0 Size:1160*430 1160*580 170mm