casting manhole covers and frames

The Ductile 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 ---- noise. ----High load-bearing ----corrosion resistance ----Safe 1. .According to BS EN124:1994, 2. The material grade: GGG500/7, 3.Coating: black bitumen,epoxy powder. 4:Ductile iron manhole covers and gully grates are divided into the following classes: A15, B125, C250, D400, E600 and F900. 1: (class A15