Transparent ABS and PS, transparency are around 86-87%, ABS is more foggy. And the transparency of PMMA is at 93%. If used to make ordinary lenses, the requirements are not too high with transparent ABS can be (such as Toray's ABS920-555), PS impact strength is very poor, easy to burst.

If the requirements of the lens is relatively high, that is, the requirement of transparency and impact resistance can choose impact PMMA, such as Mitsubishi's PMMA VRM40, VRL40, etc.. General brand cell phone lenses are used in this material.

Expanded Information:

Physical Properties

1, PMMA's density is lower than glass: PMMA's density is about 1.15-1.19 g/cm, which is half that of glass (2.40-2.80 g/cm), and 43% that of metallic aluminum (which is a light metal).

2, PMMA's mechanical strength is higher: PMMA's relative molecular mass of about 2 million, is a long chain of polymer, and the formation of molecular chain is very soft, therefore, PMMA's strength is relatively high, resistance to stretching and impact resistance is 7 to 18 times higher than ordinary glass.

There is a kind of heating and stretching processed plexiglass, in which the molecular chain segments are arranged in a very orderly manner, so that the toughness of the material has a significant improvement. With a nail into this plexiglass, even if the nail penetrates, does not produce cracks.

This plexiglass is pierced by a bullet will not break into pieces. Therefore, the stretching treatment of PMMA can be used as bulletproof glass, but also used as a seat cover on military aircraft.

3, PMMA's melting point is lower: PMMA's melting point is about 130-140 ° C (265-285 ° F), much lower than the high temperature of about 1,000 degrees of glass.

4, PMMA's higher transmittance

5, visible light: PMMA is the finest polymer transparent material, light transmittance of 92%, higher than that of glass.

6, ultraviolet light: quartz can completely through the ultraviolet light, but the price is high, ordinary glass can only through 0.6% of the ultraviolet light. PMMA can effectively filter out wavelengths of less than 300nm of ultraviolet light, but 300nm to 400nm between the filtering effect of the poor.

Some manufacturers coat the surface of PMMA to increase its effectiveness and nature of filtering UV light from 300nm to 400nm. On the other hand, in the condition of UV exposure, compared with polycarbonate, PMMA has better stability

7, infrared: PMMA allows infrared (IR) wavelengths of less than 2800nm to pass through. Longer wavelengths of IR, less than 25,000nm, can basically be blocked. Special colored PMMA exists that allows specific wavelengths of IR to pass through while blocking visible light (for applications such as remote control or thermal sensing).

8. The glass transition temperature of PMMA is about 105°C.

Baidu Encyclopedia - Poly(methyl methacrylate) Plastics