ГОСТ 3634-2019 Cast Iron Manhole covers

ГОСТ 3634-2019 Cast Iron Manhole covers
Cast Iron Manhole covers and frames standard by ГОСТ 3634-2019/ГОСТ 3634-99 for Russia market
1. According to ГОСТ 3634-2019/ГОСТ 3634-99
2. The material grade: GGG500/7,
3.Coating: black bitumen、epoxy powder or bare.
The Ductile/Grey Cast iron Manhole Covers and frames and gully and grate which are produced by our company with below advantages:
----Security, prevent the cover being stolen
----No noise.
----High load-bearing
----corrosion resistance
----Safety