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  • Making Sense of High-Temperature Thermoplastics
    the most commonly used. high-temperature thermoplastics, this article. defines these polymers as those having. a heat deflection temperature (HDT). of more than 400°F when reinforced with. 30 percent glass-fiber. (Heat deflection temperature. is the deformation temperature. of an injection-molded
  • Dissipating Static Safely
    Though it is an old problem, the dissipation of static discharge is under intense scrutiny by plastics suppliers. They are now fielding materials better able to keep test equipment out of trouble. Semitron ESd 225, with a heat-deflection temperature of 225 F and a surface resistivity of 10 O/sq
  • HVOF Process Control Using Almen and Temperature Measurement (.pdf)
    The HVOF process with reduced heat effect on the substrate and therefore minimal degradation of fatigue properties is now finding wide application in fatigue critical applications. The critical parameters for process control are residual stress in the deposit and maximum substrate temperature
  • Structural Foam
    Sulfones are amorphous engineering thermoplastics noted for high heat-deflection temperatures and outstanding dimensional stability. These strong, rigid polymers are the only thermoplastics that remain transparent at service temperatures as high as 400 F. Three commercially important sulfonebased
  • Polyetherimide
    F, and heat-deflection temperature is 392 F at 264 psi, contributing to its high strength and modulus retention for service under load at elevated temperatures. Unmodified polyetherimide is listed by UL as 94V-0 at 0.016 in. and 94-5V at 0.075 in. without the use of additives. Limiting oxygen
  • Liquid-Crystal Polymers
    Liquid-crystal polymers are a unique class of wholly aromatic polyester poly mers that provide previously unavailable high-performance properties. Particularly outstanding is their heat-deflection temperature at 264 psi of 460 to 606°F. Structure of the LCPs consists of densely packed fibrous
  • Rapid-prototyping resin good enough for wind-tunnel tests
    is a ceramic-filled resin that forms highly stiff and dimensionally accurate parts. It has a modulus of 10,000 MPa, a linear shrinkage of under 0.025 mm (0.00098 in.), and a heat-deflection temperature of 279 C (534 F). The dimensions for the scaled model of the M-346 aircraft are 1 x 1 x 0.2 m
  • Down-to-earth role for imidized polymers
    has a heat-deflection temperature (at 264 psi) of 392 F. Designers of the B-2 Stealth Bomber or Lunar Lander probably didn't hesitate specifying imidized polymers for their designs. But though these materials are tough and ultralight, some designers see them as too exotic for mainstream uses
  • How retaining forces affect spindle bearings
    deflection of the bearing assembly. The FEA model shows a typical cap loaded with a uniform pressure along its area of contact with the outer race of the bearing. A zero-displacement boundary condition was applied to the area of the cap that contacts the housing. Although this simplification