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The characteristics of polycarbonate compare to those of polymethyl methacrylate (PMMA, acrylic), but polycarbonate is stronger and will hold up longer to extreme temperature. Thermally processed material is usually totally amorphous, [ 7 ] and as a result is highly transparent to visible light , with better light transmission than many kinds ...
Laminates, metal non-metal Taylor I 30 varnished silicon steel foils each of thickness 0.014 inches (0.356 mm): density 7.36 g cm −3; measured near a temperature of 358.2 K under pressure in the range 0 — 132 psi: 0 psi 0.512 w m −1 K −1 20 psi 0.748 40 psi 0.846 60 psi 0.906 80 psi 0.925 100 psi 0.965 120 psi 0.992 132 psi 1.02 120 psi ...
A polycarbonate is an oxocarbon dianion consisting of a chain of carbonate units, where successive carbonyl groups are directly linked to each other by shared additional oxygen atoms. That is, they are the conjugate bases of polycarbonic acids , the conceptual anhydrides of carbonic acid , or polymers of carbon dioxide .
Twinwall Polycarbonate sheeting is primarily installed with glazing bars, which secure the sheets down to the frame, whether timber, metal or other framing material. The type of glazing bar used it critical for the strength of the roof and depends on the thickness of polycarbonate and structure design.
For a material that has been strengthened, by some processing method, the amount of force required to start irreversible (plastic) deformation is greater than it was for the original material. In amorphous materials such as polymers, amorphous ceramics (glass), and amorphous metals, the lack of long range order leads to yielding via mechanisms ...
Its thermal conductivity (2,200 W/m•K) is five times greater than the most conductive metal (Ag at 429); 300 times higher than the least conductive metal (Pu at 6.74); and nearly 4,000 times that of water (0.58) and 100,000 times that of air (0.0224). This high thermal conductivity is used by jewelers and gemologists to separate diamonds from ...
This may be considered to be the elastic limit and the yield stress is now equal to the fracture toughness, which is much higher than a non-work-hardened steel yield stress. The amount of plastic deformation possible is zero, which is less than the amount of plastic deformation possible for a non-work-hardened material.
Creep deformation is important not only in systems where high temperatures are endured such as nuclear power plants, jet engines and heat exchangers, but also in the design of many everyday objects. For example, metal paper clips are stronger than plastic ones because plastics creep at room temperatures.