Polymer Thermal Deflection Test Equipment

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• Machined plastics pass the test
  F, a typical requirement for test sockets. "The first generation of material used to build test sockets was based on Vespel SP-1 (polyimide). This was replaced by unfilled and glass-fiber-filled Torlon PAI (polyamide-imide) thanks to the latter's lower coefficient of linear-thermal expansion (CLTE...
• Sulfone Polymers
  do not discolor or degrade. Thermal stability and oxidation resistance are excellent at service temperatures well. Heat aging of the polymers increases tensile strength, beat-deflection temperature, and modulus of elasticity appreciably. However, prolonged heat aging (about a year) decreases...
• Liquid-Crystal Polymers
  mechanical-property retention after exposure to weathering and radiation; good dielectric strength, arc resistance, and dimensional stability; low coefficient of thermal expansion; excellent flame retardance; and easy processibility. UL continuous-use rating for electrical properties is as high as 240 C...
• Structural Foam
  to such temperatures, the resins do not discolor or degrade. Thermal stability and oxidation resistance are excellent at service temperatures well. Heat aging of the polymers increases tensile strength, beat-deflection temperature, and modulus of elasticity appreciably. However, prolonged heat aging (about...
• No more "girlie man" gears
  . Fatigue strength curves generated by the P-Gear unit are measured on standard 2-in. test gears. The data shown was taken using gears made from Celcon M15HP acetal copolymer, a high-performance gear material. Plastic gears have had a successful run in automobiles, appliances, office equipment, and power...
• Dissipating Static Safely
  applications. ESd fluoropolymer has a heat-deflection temperature of 500°F and a surface resistivity of 1010 to1012 Ω/sq. The material is used as thermal insulation for test chambers, test fixtures, and boat inserts. It's also well suited for aggressive wet chemical environments, such as wafer etching...
• Tough Enough
  engineering plastic used in semiconductor processing equipment. Carbon fibers (CF) improve dimensional stability, especially in crystalline polymers suck as PEEK. Dimensional change at saturation for various back-end test-socket materials. Celazole PBI will work continuously to 600 F and even...
• Glossary of Tems for Technical Foams
  a flat compression foot larger than the specimen to be tested. The value is typically expressed at 25%, 40%, 50%, and/or 65% compression per ASTM D-3574-01 Test C. Also called Compression Load Deflection or CLD. Chemical Resistance. The fundamental ability of a polymer to withstand chronic exposure...
• More mettle for sheet metal
  are relatively small. Delaying the onset of buckling helps fully realize the mechanical properties of the sheet metal. The material properties that steel brings to the union are largely independent of temperature and include a high Young's modulus, low coefficient of thermal expansion, and a combination of high...
• Fatigue and Impact Testing of Composites Keeps Aerospace Industry Flying High
  due to material defects.  In 1949-1950, the failures of the de Havilland Comet I, the first commercial airliner, demonstrated the importance of materials science and testing.  A unique test at RAe Farnborough on a grounded Comet showed that, after being subjected to stresses equivalent to 9,000...

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