SPS grades tackle electronics challenge. (Materials).Requirements for electronic connectors, headers, and housings in automobile are getting tougher than ever. An emerging trend to 42V electrical systems is changing the playing field. Under the hood under the hood - [hot-rodder talk] 1. The underlying implementation of a product (hardware, software, or idea). Implies that the implementation is not intuitively obvious from the appearance, but the speaker is about to enable the listener to grok it. especially auto makers want materials with better thermal properties and dimensional stability dimensional stability, n See stability, dimensional. than is offered by most current reinforced PBTs and high-temperature nylons in addition car makers are searching for faster-cycling materials. In response, Dow Plastics in Midland Mich., has introduced a pair of glass-reinforced syndiotactic A syndiotactic macromolecule in polymer chemistry is a tacticity essentially comprising alternating enantiomeric configurational base units which have chiral or prochiral atoms in the main chain in a unique arrangement with respect to their adjacent constitutional units. polystyrene (SPS (Standby Power System) A UPS system that switches to battery backup upon detection of power failure. See UPS. SPS - Symbolic Programming System. Assembly language for IBM 1620. ) candidates. They are Questra WA210 with 20% glass and impact-modified WA212 with 30% glass. Initial uses of these grades are in 2002-model German vehicles. "SPS being a crystalline polymer offers superior temperature resistance lower moisture pick-up and improved warp-resistance versus existing polyesters and nylons," says Dow's European market manager. Jean-Marc Galvez Ruiz. He explains that these qualities yield greater reliability in wire-to-wire and wire-to-bolt boxes and other under-hood and passenger-compartment parts. The SPS grades have low moisture absorption and Vicat softening points Vicat softening point is the determination of the softening point for materials such as polyethylene, which have no definite melting point. It is taken as the temperature at which the specimen is penetrated to a depth of 1 mm by a flat-ended needle with a 1 sq. considerably higher than competing compounds SPS's outstanding dimensional stability eliminates the need for mineral fillers commonly used to counter warpage in nylon and PBT PBT Provider Backbone Transport (networking technology adding determinism to ethernet) PBT Polybutylene Terephthalate PBT Profit Before Tax PBT Paper Based Test (education) Ruiz also says SPS offers superior dielectric constant dielectric constant n. See permittivity. and dissipation factor In physics, the dissipation factor (DF) is a measure of loss-rate of power of a mechanical mode, such as an oscillation, in a dissipative system. For example, electric power is lost in all dielectric materials, usually in the form of heat. has 20% lower density than competing nylon or PBT grades and permits significantly shorter molding cycles as well. *26* NEW QUESTRA REINFORCED SPS Grade WA210 WA212 Glass, % 20 30 Specific Gravity 1.16 1.25 Tensile Str., psi Yield 13,000 15,900 Break 13,000 15,900 Ult. Elongation, % 2.0 2.0 Flex. Strength, psi 20,000 25,000 Flex. Modulus, psi 980,000 1,360,000 Notched Izod, ft-lb/in. 73 F 1.5 2.0 0[degrees]F 1.55 1.7 HDT, F 66 psi 489 505 264 psi 370 480 Vicat, F 496 496 Dielectric Constant 3.1 3.1 Dissipation Factor 0.001 0.001 Dielect. Str., V/mil 635 635 Volume Resistivity, [10.sup.12] ohm-cm 4.4 4.4 Comparative Tracking Index, V 480 480 Moisture Absorp., %, 24 hr 0.01 0.01 |
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