The common materials for trench cover grating are mainly the following categories:
1. Metal materials
* Cast iron: It has the characteristics of high strength, high hardness and good wear resistance. It can withstand greater pressure and impact force. It is suitable for roads, docks, cargo yards and other places where heavy vehicles frequently pass. Its compressive strength can usually reach more than 300MPa, which can effectively resist the crushing of heavy objects. The disadvantages are high density, heavy weight, relatively difficult installation and maintenance, and easy to rust in a humid environment, requiring rust prevention treatment.
* Stainless steel: It has excellent corrosion resistance, high temperature resistance and good toughness, and can maintain stable performance in various harsh environments. Stainless steel grating cover is an ideal choice for highly corrosive environments such as coastal areas and chemical parks. Its corrosion resistance mainly comes from the chromium element. When the chromium content reaches a certain proportion, a dense oxide film will be formed on the surface to prevent further corrosion. However, the cost of stainless steel materials is relatively high and the price is expensive.
* Steel grating: It is welded from flat steel and twisted square steel or round steel. It has high strength, large load-bearing capacity, good ventilation and light transmission, and is widely used in industrial plants, sewage treatment plants, etc. The surface is usually hot-dip galvanized to enhance corrosion resistance. The hot-dip galvanized layer can make the service life of the steel grating more than 20 years.
2. Plastic material
* Polypropylene (PP): It has the advantages of light weight, strong corrosion resistance, good insulation performance, and low price. Its density is only a fraction of that of metal, which is easy to install and carry. At the same time, it has good tolerance to chemical substances such as acids, alkalis, and salts, and is suitable for some environments sensitive to chemical corrosion, such as laboratories, electroplating workshops, etc. But the disadvantage is that the strength is relatively low and the heat resistance is limited.
* Polyvinyl chloride (PVC): It has good weather resistance, water resistance and flame retardancy, and its appearance can be designed. It can be made into grille covers of various colors and shapes. In some places where there are requirements for environmental beauty, such as parks and communities, PVC grille covers are widely used. However, it may deform under high temperature environment, and may age and become brittle after long-term use.
3. Composite materials
* Glass fiber reinforced plastic (FRP): commonly known as FRP, combines the high strength of glass fiber and the good formability and corrosion resistance of resin. It has the characteristics of light weight, high strength, good corrosion resistance, excellent insulation performance, and anti-aging. Its specific strength (ratio of strength to weight) is much higher than that of metal materials, and it is highly designable and can meet different load and environmental requirements, but the price is relatively high.
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