摘要:
A water-vapor-permeable, watertight, heat-reflecting flat composite is made by a process of combining a metal layer and a nonporous, water-vapor-permeable, watertight, hydrophilic flat substrate. The process includes at least the three steps of (1) selecting the substrate, (2) pre-cleaning the substrate, and (3) applying the substrate to the metal layer. Such a composite offers protection from heat loss, infrared-based detection, ultraviolet radiation, electro-smog, and static electricity.
摘要:
A composition useful as an impregnant for the making of laminates for printed wiring boards including an epoxy resin a first cross-linking agent of a strene-maleic anhydride copolymer and a second co-cross-linking agent.
摘要:
A resin composition that may be applied to make laminates and printed wiring boards. The composition includes a copolymer of styrene and maleic anhydride (SMA) as a cross-linking agent, and a mixture of an epoxy resin and a bismaleimide triazine resin.
摘要:
A piston for internal combustion engines, preferably made from aluminum alloy, has machined, oil-dragging grooves formed on the periphery of the piston skirt and concave transitions with a sawtoothlike profile with an obtuse profile angle. The piston skirt is provided with an electrodeposited hard iron layer having a thickness of 1-30 .mu.m and contains 0.5-6% metal-oxy compounds incorporated therein.