It also has a high heat deflection temperature and absorbs very little moisture. ASTM D7Water Absorption 0. It possesses unusually high impact strength and toughness even at low temperatures, has low moisture absorption, good heat and electrical resistance and good oxidative and thermal stability. Polycarbonate Physical Properties Metric English Comments Specific Gravity 1. Machine grade polycarbonate easily machines to close tolerances, is flame resistant and sees high mechanical retention at elevated temperatures. The index of refraction of transparent and colorless PC is very high, 1.
The industrial grades of PC have molecular weights on the order of 20to 5000g. The basic steps involve the heating, shaping and cooling of a thermoplastic sheet product. Currently, lenses made from polycarbonate materials provide the highest level of impact protection. When thick, it has a slight yellowish tint. Facts About Eye Injuries.
Nearly one million Americans have lost some degree of sight (a chronic or permanent disability) due to an eye injury. About have a severe impairment and about are blind in one eye. To seal the top ends with the polycarbonate tape: a. Lay out the Multi-Wall panel on a flat surface.
Peel back plastic film on each side of the panel about to from edge (fig 1). Measure panel width and cut polycarbonate tape to length. Peel off protective backing on tape. R e gu lat prs nd ico h is observed.
Use air or water as a coolant if required. Using cutting oils may cause crazing. Plastic packaged food lasts longer, reducing wastage. Use of plastic in pipes facilitates clean drinking water supplies, while plastic enables life-saving medical devices such as surgical equipment and drips.
Material Formula Coefficient of thermal expansion x10-K-Heat- deflection temperature - 0. MPa C Heat- deflection temperature - 1. Classification of processing methods 1. Primary Processing Methods: Injection, Extrusion, Blow, Compression and transfer moulding. High-performance properties of this plastic polymer make it a leading plastic material for a number of applications. MAKROLON AR polycarbonate sheet also performs well for view windows and machine guards in harsh chemical environments. The polycarbonate layer plays an essential role by acting as a lens, focusing the laser beam so it can read the disc, similar to how reading glasses help focus the light for an eye to see clearly.
It is a lighter alternative to glass and a natural UV filter, so it is often used in eyewear. The main advantage of this material over other types of plastic is its great strength combined with light weight. While acrylic is stronger than glass, polycarbonate is nearly unbreakable.
Bulletproof windows and enclosures as seen inside banks or at drive-throughs are often made of this plastic.
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