CaZn for wire matches cost-performance of lead. (Keeping up with Additives).Three families of calcium-zinc heat stabilizers for PVC PVC: see polyvinyl chloride. PVC in full polyvinyl chloride Synthetic resin, an organic polymer made by treating vinyl chloride monomers with a peroxide. are said to be cost-effective alternatives to lead in a broad range of wire and cable. New Therm-Chek powder stabilizers from Ferro Corp.'s Polymer Additives Div. in Independence, Ohio, boast dynamic thermal stability comparable to that of lead but at reduced use levels and without higher cost. * General-purpose, tray, and riser jacketing: RC 149P, RC 216P, and RC 197P are said to outperform tribasic tri·ba·sic adj. 1. Relating to an acid containing three replaceable hydrogen atoms per molecule. 2. Relating to a base or salt containing three univalent basic atoms or radicals per molecule. lead sulfate (TBLS TBLS Texas Board of Legal Specialization TBLS Technology Based Learning for Schools TBLS The Brendan Leonard Show ) in dynamic color-stability tests at a process temperature of 356 F. In catastrophic testing at elevated temperatures and screw rpm, they match the performance of lead-based products but at lower loading and lower cost. Aged physical properties are equal to or better than lead. No process modifications are needed as these additives have little effect on lubricity and processing characteristics. * SVT SVT supraventricular tachycardia. SVT abbr. supraventricular tachycardia SVT Supraventricular tachycardia, see there , SPT, SJT, and SJTW cordage cordage (kôr`dĭj), collective name for rope and other flexible lines. It is used for such purposes as wrapping, hauling, lifting, and power transmission. Early man used strips of hide, animal hair, and plant materials. : RC 232P can replace TBLS at similar cost in these applications. In UL 62 tests on 14AWG (American Wiring Gauge) A U.S. measurement standard of the diameter of non-ferrous wire, which includes copper and aluminum. In general, the thicker the wire, the greater the current-carrying capacity and the longer the distance it can span. wire, it yields higher insulation resistance than TBLS. Similar results are achieved in dynamic color-stability tests. Processing and aging characteristics are said to be comparable to TBLS. * THHN and TRWN wire: RC 215P and RC 217P meet UL 83 requirements for wet electrical resistance. Compared with a lead-based THWN formulation on 14 AWG wire, RC 215P yielded significantly higher insulation resistance values after 26-week immersion in water at 432 F, Ferro reports. RC 217P is a low-cost version of RC 215P but its color-stability, processing, and aging characteristics reportedly are still equal to or better than those of lead. Tel: (216) 641-8580, www.ferro.com |
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