why can hard hats withstand pressure

ABS safety helmet belongs to plastic safety helmet, in which the full name of ABS is acrylonitrile butadiene styrene resin. This engineering plastic has heat resistance, high surface hardness, stable size and good chemical resistance. At the same time, the electrical insulation performance is good, which is rarely affected by temperature and humidity, and remains constant in a large frequency range. 1n addition, its chemical properties are very good. 1t has almost no effect on water, inorganic salts, alkali and acids. The disadvantage of ABS safety helmet is that it is intolerant to combustion, low temperature resistance and poor aging resistance. ABS safety helmet is mainly used in mining, machinery industry and other places with high impact strength and normal temperature

HDPE safety helmet is made of high-density polyethylene, which has high surface hardness, good heat resistance, electrical insulation and dimensional stability, and is widely used in safety helmet production. However, the compressive strength of this material is poor. 1f the internal structure of the cap shell and the wall thickness design of the product are not improved, the side pressure test is often unqualified. Therefore, the side pressure resistance design of the safety cap brim of this material must be strengthened, otherwise it is difficult to pass the European, Australian, Japanese and Chinese standards. The HDPE safety cap has a wide range of applications, such as metallurgy, chemical industry, mining, construction, machinery, electric power, etc Transportation, forestry and geological work can be used. As there is no side pressure in North American Standard, HDPE safety helmet is widely used in America, while HDPE safety helmet is not used in Japan, South Korea and other countries

FRP safety helmet is made of glass fiber reinforced plastic, which has high fiber strength, excellent heat resistance and electrical insulation performance, as well as excellent acid and water resistance, flame retardant, small deformation and other characteristics. There are safety helmets made of this material all over the world. FRP safety helmets will be used in some special occasions, such as metallurgical high-temperature workplace, oil field drilling, etc, 1t is used for forest harvesting or construction in cold areas

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