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The material of cast iron well covers determines its superiority

There are many types of covers, iron, cement, resin, composite, then what kind of material covers good quality? The following is for you to analyze nandrolone
Cement covers - cement covers is originally used more and more for some small occasions and not too obvious, low cost cement covers, with active anti-theft, and cement covers generally relatively thick, the lower the value of recycling, so it is not easy to lose. But cement covers are generally poor bearing, so the safety factor is low.
Composite manhole covers - composite covers are made of non-metallic materials, the middle of which is made of steel support, covers are usually high polymer materials, glass fiber materials, resin materials. Composite manhole covers are colorful and changeable, and have the characteristics of active anti-theft, and they are more and more widely used. The composite well covers are light in weight but low in weight, so the safety factor is high.
Ductile iron covers - ductile rigid covers best, compared to the other two covers the cost of slightly higher, but some important occasions such as high load, high speed, main roads of the city, basically covers more ductile or application. Because it bears the best load, the safety factor is the highest.
1 cast iron manhole covers, now cast iron covers accurate ductile iron covers, due to good material (metal), good pressure resistance, high load, widely used in municipal roads, highways, communications, electricity, tap water, and other school district, park. Especially in the second ring, high-speed, airport heavy load occasions, the use of metal materials of cast iron manhole cover. Cast iron manhole cover: suitable for setting in municipal roads, highways, communications, power, water, residential areas, schools and other parks. FRP covers: mainly used in municipal roads, water supply, power supply, post and telecommunications, street lamps, residential areas, garden planning, oil and gas extraction, chemical production, sewer cover, sanitation and other projects. Steel fiber concrete covers: widely used in municipal engineering, construction projects, public works, gardens and so on, all the ground, road drainage, water discharge sites and regions.
2 composite covers are mainly used in municipal roads, water supply, power supply, post and telecommunications, street lamps, residential areas, garden planning, oil and gas extraction, chemical production, sewer cover, sanitation and other projects. Its characteristics, bright colors, custom-made patterns, etc., especially in high-grade residential areas and villas and other occasions, is the mainstream of application.
3 cement covers, widely used in municipal engineering, construction projects, public works, gardens and so on, all the ground, road drainage, water discharge sites and regions. Generally used in low load areas and other occasions, can not be subjected to pressure, communications, such as China Unicom, telecommunications, mobile, etc., with more covers

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