Lockable D400 SMC GRP FRP Composite Material Square Round Manhole Cover
Material |
Fiberglass FRP/grp |
Size |
D300-D1000mm |
Temperature |
-20°C-60°C (requirements under the maximum design 3.temperature 120 °C flap valve) |
Working pressure |
1-1.6MPa |
Opening angle of the cover |
>75° |
Closed time |
<2s |
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