Do you have helmets and bamboo now?
HDPE plastic is High Density Polyethylene. This material has high surface hardness, good heat resistance, electrical insulation and dimensional stability. It is widely used in safety helmet production. But the compressive strength of the material, if the shell internal structure and the thickness of the product design is not improved, often lateral pressure test is not qualified, so this material safety cap must strengthen the anti pressure design, or in Europe, Australia, Japan and Chinese standard is difficult to get through. As the North American Standard has no side pressure, HDPE helmets are widely used in the Americas, while in Japan, South Korea and other countries, HDPE helmets are not produced.
ABS plastic full name for acrylonitrile butadiene styrene resin, that is, in English Acrylonitrile Butadiene Styrene abbreviation, this engineering plastics with heat resistance, high surface hardness, dimensional stability, good chemical resistance. At the same time, electrical insulation has good performance, is seldom affected by temperature and humidity, and remains constant in a wide range of frequency variations. In addition, its chemical properties are very good, and have little influence on water, inorganic salts, alkalis and acids.
There are a lot of production safety cap materials, materials commonly used at home and abroad production safety helmet shell are: ABS material, HDPE material and PC material, FRP material; the cap hoop internal structure, mainly composed of LDPE, PA and other materials produced by HDPE; the top liner or sponge composite nylon material production, suction the sweat belt from PVC film, acrylic fiber or cloth towel sponge material, acrylic and polyester with cap hoop corresponding connecting piece. The main products of the main helmets in the world are briefly described as follows: (according to international practice, classification of safety helmet materials)
In addition to the above 4 kinds of large material safety helmet, there are several kinds of safety helmet, mainly in China production, in foreign helmet manufacturer and Exhibition almost see.(1) rubberized fabric safety helmet: Rubber and canvas hot press tape, safety helmet.(2) cold proof safety helmet: made of plastic inner shell, the outer cover is made of sheep shearing and plush, and it is suitable for winter protection.(3) safety helmet safety helmet: bamboo as raw material with bamboo pole.(4) RATTAN WICKER safety helmet: this kind of safety helmet is a kind of safety helmet made of rattan or wicker material, but its flame retardant effect is very poor.(5) aluminum safety helmet: aluminum alloy safety helmet is produced by die casting of household aluminum.
PC plastic is polycarbonate material (Polycarbonate). The material steel is hard and tough. It has high impact resistance, high dimensional stability, good electrical insulation and high temperature resistance. Because of its high price, other countries rarely use it except japan. Of course, because some of the PC materials have good temperature resistance, many metal smelting industries need this kind of high temperature resistant PC safety helmet.
