The material of composite material manhole cover is GRP , shorted for Glass Reinforced Plastic.
Our GRP products are made of:
i) unsaturated polyester resin(UP) (Iso type resin, vinyl ester resin) glass fiber (E-glass 2400 Tex))
ii) quartz
iii) corundum
iv) antioxidant
v) firming agent
vi) promoter
vii) UV additive
viii) ethylene-propylene-diene-monomer
ix) Cr13
x) other auxiliary materials
Advantages of GRP products:
a.Hight load ability accroding to BS EN 124 Standard
b.Quality assrance by ISO9000:2008&SGS
c.Zero Scrap Value-Burglarproof &never rusted
d.Resistance to weak acid and week base,salt,seawater
e.Temperature resistence from -40 to 80degree
f.Design with characterristic logo &various colors
g.Life span at least 30years