分層復合井蓋是指：用不飽和聚酯樹脂作基體質料，用玻璃纖維作加強質料，輔以肯定剛性質料。布局上接納鍋底布局，底部抗拉質料受力勻稱;材質上分上下兩層，上部接納耐磨、耐老化質料，產物的利用壽命長。下部接納一連玻璃纖維加強，可以使井蓋具有充足的承載本領，而不需任何鋼筋加強。是幾種復合井蓋中綜合性能較好的一種質料井蓋。

分層復合井蓋的長處：

1、防盜

2、承載本領高

3、表面美麗

分層復合井蓋的缺點：

1、表面硬度高、而脆性稍高

2、代價稍高

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