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The impact energy on the wearer's head also depends on the thickness of the EPS buffer layer. Compared with a buffer layer with a thickness of 1 cm, when the thickness of the EPS reaches 3 cm, it will further extend the energy transmission time and make the buffer layer withstand greater impact; and when the EPS buffer layer has a lower density and a thicker layer, If the impact force is not strong, it will extend the energy transmission time instead of reaching the bottom of the buffer layer faster, making the wearer more comfortable. Of course, if the buffer layer is too thick, on the one hand it will affect the appearance, on the other hand, it may also cause other damage in the impact. Therefore, the ideal thickness of the EPS buffer layer must ensure that it is strong enough to adapt to different types of impacts: it has a certain degree of hardness and minimizes the energy conduction on the premise of avoiding damage; and it has a certain degree of elasticity. Plays the role of absorbing collision energy in small impact.
GRP(Glass-fiber Reinforced Polyester) is made up of specially optimized polyster. After high speed dispersion of various auxiliaries, reinforced glass fiber and functional fillers are mixed into aggregates by professional kneading machine, and then high temperature and high pressure molding is carried out by hydraulic press.The process has the advantages of fast foaming, accurate foaming, good product stability and high degree of automation, and is a representative of a new generation of high-end composite material processing technology.
Insulating concrete formwork (ICF) otherwise known as permanently insulated formwork (PIF) is an insulated in-situ concrete system of building that is quick to construct and offers levels of performance significantly better than that available from slower, more traditional approaches to building. Popular in Germany where it was born in the early 50's, it is grown rapidly in North America starting as a basement construction and now has approximately 8% share of the low rise housing market in Canada and the USA.
The density of EPS is one of the main design parameters of the helmet cushion. The denser EPS can play a good role in resisting the impact transmission to the head before the energy impact reaches the limit; the less dense EPS is easier to compress and deform when subjected to a slight impact, and further absorb the impact energy to prevent impact Causes concussion and other injuries. Under normal circumstances, the ideal EPS buffer layer has a weight between 90 grams and 100 grams. The simplest identification method is to pinch the EPS by hand and estimate the density by feeling its hardness.
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