The properties of polymethyl methacrylate produced by blister machine

The density of PMMA is lower than that of glass: the density of PMMA is about 1.15-1.19 g/cm, which is half that of glass (2.40-2.80 g/cm) and 43% of that of metal aluminum (a light metal). The mechanical strength of PMMA is relatively high: the relative molecular mass of PMMA is about 2 million, it is a long-chain polymer, and the chain forming the molecule is very soft. Therefore, the strength of PMMA is relatively high, and the ability of tensile and impact resistance is relatively high. 7~18 times higher than ordinary glass. There is a kind of plexiglass that has been heated and stretched, in which the molecular segments are arranged in a very orderly manner, so that the toughness of the material is significantly improved. The plexiglass is driven with a nail, and even if the nail penetrates, it will not crack. This kind of plexiglass is also not broken into pieces after being penetrated by a bullet. Therefore, stretch-treated PMMA can be used as bulletproof glass and also as canopy on military aircraft.