The material of composite material manhole cover is GRP, shorted for Glassfiber 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.High load ability according to BS EN 124 Standard
b.Quality assurance 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 characteristic logo &various colors
g.Life span at least 30years
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