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 

Our products are strictly produced according to the BS EN124 and have obtained various kinds of certificates. Until now, our competitive products not only had good market in home, but also exported to many countries such as Malaysia, Thailand, Vietnam, United Arab Emirates, Oman, Bulgaria, Kuwait, Qatar, India, Greece, Spain and so on.