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First originated from Magu company in Germany, EPS material ICF is widely used in German multi-storey residential buildings, and has a history of nearly 30 years in foreign countries, and its technical maturity has reached a high level.The polystyrene module is heated and foamed by the modified flame-retardant polystyrene particles, and the polystyrene foam plastic section with a dovetail groove structure is arranged on the inner and outer surfaces of the module by using a special process and a special equipment to heat and form at one time, the periphery of the module is provided with a cross or a square-shaped rectangular plug-in groove; the inner and outer surfaces of the module are provided with a devotail groove structure.
The EPS buffer layer is very light, 98% of its components are air, so in addition to buffering, it can also play a good role in heat insulation. Of course, if it comes to summer, it is necessary to maintain air circulation inside the helmet to prevent heat accumulation. Reducing the thickness of the buffer layer or designing vents becomes particularly important. The reduction in the amount of EPS means that the strength of the EPS must be further improved so that it will not be completely broken under the impact of energy. Of course, the price will be higher. At the same time, relative to the buffer layer is thicker, the safety of EPS with no or very small vent design is worse, depending on the needs of the wearer.
Whether it is a single high-hardness EPS or ordinary EPS used for helmet cushioning, it has its limitations. With the continuous development of EPS products and technology, the layered EPS material that combines two different density EPSs has solved the above problems. It can ensure that the EPS outside the buffer layer has higher hardness to resist energy impact, and at the same time, the internal elasticity is better. High EPS has better cushioning effect. In addition, there are other dual-density helmets, and the density of different layers is different.
GPPS plastics are universal grade polystyrene (GPPS), polystyrene (PS) is made of styrene monomer (SM) polymerization, which can be synthesized by a variety of synthesis methods. At present, bulk polymerization and suspension polymerization are mainly used in industry. PS is a thermoplastic non-crystalline resin, which is mainly divided into general-purpose polystyrene (PPS, commonly known as benzene-permeable), impact-resistant polystyrene (hips, commonly known as benzene modified), and expanded polystyrene (EPS).
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