分层复合井盖是指：用不饱和聚酯树脂作基体质料，用玻璃纤维作加强质料，辅以肯定刚性质料。布局上接纳锅底布局，底部抗拉质料受力匀称;材质上分上下两层，上部接纳耐磨、耐老化质料，产物的利用寿命长。下部接纳一连玻璃纤维加强，可以使井盖具有充足的承载本领，而不需任何钢筋加强。是几种复合井盖中综合性能较好的一种质料井盖。

分层复合井盖的长处：

1、防盗

2、承载本领高

3、表面美丽

分层复合井盖的缺点：

1、表面硬度高、而脆性稍高

2、代价稍高

Layered composite covers means: unsaturated polyester resin as a base material constitution, strengthened with glass fiber material, supplemented certainly rigid material. Acceptance layout layout pot bottom material tensile force proportioned; material on the upper and lower layers, the upper acceptance resistant, anti-aging material, the use of long-life products. The lower part of a row of glass fiber reinforced accepted, the covers can have sufficient bearing ability, without any steel strengthened. Is one of several composite covers a better performance in integrated material covers.

Layered composite covers strengths:

1, anti-theft

2, carrying high skills

3, the surface beauty

The disadvantage of layered composite covers

1, high surface hardness, brittleness and higher

2, higher costs