China Fiber Reinforced Composite Plastic Manhole Covers with Frames Main components including glass fiber, unsaturated polyester resin, filler and related additives. 1.Surface: It can be made in decorative surface designs with different logo as per its application and customer’s requirement. 2.Good temperature resistance from -40 to 80 Centigrade Materials of Fiber Reinforced Composite Plastic Manhole Covers; How to Produce the Fiber Reinforced Composite Plastic Manhole …