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
Advantage of our composite manhole cover:
1. No recycle value: Its popularity will contribute the manhole cover-stolen problem thoroughly.
2. High load capacity: Its high load capacity exceeds the ductile iron manhole cover.
3. Free design: It can be designed individually in terms of users' demands.
4. Good decorative effect: It can be designed in various colors and patterns with artistic effect of relief.
5. Long service life: There is no any crack in the experiment of 2, 000, 000 fatigue shocks.
6. Well sealed: It can be used to hermetically, and effectively prevent those poisonous gases leaking out from cesspool.
7. No any jangle: There is neither jangle nor rebound when cars pass by.
8. Good wear and corrosion resistance: It has good wear and corrosion resistance and it will be never rusted.
