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It is often preferred because of its moderate properties, easy handling and processing, and low cost, but behaves in a brittle manner when loaded, especially under an impact force. Acrylic, or acrylic fiber, can also refer to polymers or copolymers containing poly acrylonitrile. The material was developed in 1928 in various laboratories and was brought to market in 1933 by Rohm and Haas Company. Trade names: Plexiglas, Vitroflex, Limacryl, R-Cast, Per-Clax, Perspex, Plazcryl, Acrylex, Acrylite, Acrylplast, Altuglas, Polycast, Oroglass and Lucite and is commonly called acrylic glass, simply acrylic or plexiglas.Other names: Methyl Methacrylate resinPHYSICAL AND MECHANICAL PROPERTIESGeneral physical properties PMMA is a glassy polymer with an amorphous structure. It has a density of 1.19 g/cm3 and has very low water absorption. The refractive index ranges from 1.49 to 1.51 depending on the type. Mechanical properties Thermal properties Parts made of PMMA have high mechanical strength and good dimensional stability. PMMA is one of the hardest thermoplastics and is also highly scratch resistant.THERMAL, ELECTRICAL AND OPTICAL PROPERTIESHeat-stabilized types can withstand temperatures of up to 100oC. PMMA can withstand temperatures as low as - 70oC. Resistance to temperature changes is very good. Glass transition temperature of PMMA is in the range of 100-1200C. Fire behavior PMMA ignites very quickly. It burns with a blue glow, even outside the flame, and crackles with white spurts. · Electrical propertiesPMMA has good insulating properties, a high dielectric strength and high tracking resistance.Pages: 1 2 3 [4] 5 6 7 8 9 10 11 12 13 14
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What is the Gold Krugerrand Price Today?The 1904 double eagle is an offering that is a considerably popular coin and impressively accessible on the gold market. The coin itself varies in terms of condition and the 1904 double eagle coin’s condition and appearance play a heavy roll in its value. A 1904 double eagle that is in mint condition might cost between 1200 dollars and 1700 dollars, depending upon the price of gold and the seller. If the 1904 double eagle coin is in circulated condition, you can anticipate that the coin will There are certain things you need to look for when you are buying a double eagle gold coin. You will want to consider the condition of the double eagle gold coin, whether you are opting for the liberty double eagle gold coins, the St. Gauden double eagle gold coin, or the newer double eagle gold coins crafted after the year 1986. |