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  The density of PMMA is lower than that of glass: the density of PMMA is about 1
15-1
19 g / cm3, half of that of glass (2
40-2
80 g / cm3) and 43% of that of metal aluminum (a light metal)
The mechanical strength of PMMA is high: the relative molecular weight 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 tensile and impact resistance is 7 ~ 18 times higher than that of ordinary glass
There is a kind of plexiglass treated by heating and stretching, in which the molecular segments are arranged in a very orderly manner, which significantly improves the toughness of the material
Nail into this plexiglass, even if the nail penetrates, it will not produce cracks
This kind of plexiglass will not break into pieces after being punctured by the bullet
Therefore, the stretched PMMA can be used as bulletproof glass and cockpit cover on * aircraft
The melting point of PMMA is low: the melting point of PMMA is about 130 & ndash; 140° C (265 & ndash; 285 & deg; F), much lower than the high temperature of about 1000 degrees of glass
PMMA has high light transmittance
Visible light: PMMA is the best polymer transparent material at present, with a light transmittance of 92%, which is higher than that of glass
Ultraviolet light: quartz can completely pass through ultraviolet light, but the price is high
Ordinary glass can only pass through 0
6% ultraviolet light
PMMA can effectively filter ultraviolet light with wavelength less than 300nm, but the filtering effect is poor between 300nm and 400nm
Some manufacturers coated the surface of PMMA to increase its effect and properties of filtering ultraviolet light from 300nm to 400nm
On the other hand, when exposed to ultraviolet light, PMMA has better infrared stability than polycarbonate: PMMA allows infrared (IR) with a wavelength less than 2800nm to pass through
Longer wavelength IR, less than 25000nm, can be basically blocked
There is a special colored PMMA, which can allow specific wavelength IR to pass through and block visible light (applied to remote control or thermal sensing, etc
)
The glass transition temperature of PMMA is about 105 & deg; C。