Polymer keeps water out and circuits safe

Zenite liquid crystal polymer, from DuPont, replaces a thermoset epoxy for encapsulating the valve solenoid. The injection-moldable LCP is also used for the valves internal coil bobbin. DuPont helped Asco determine that the 30% glass-reinforced LCP, with a UL94 V-0 flammability classification, was the best candidate. The LCP is dimensionally stable and resists thermal cracks. These are key properties that help ensure valves in air compressors, fire pumps, gas generators, and other equipment withstand aggressive chemicals or splashing, seeping, falling or hose-directed water and severe condensation that can often wreak havoc on electronics, says Nick Buccher, Asco vice president of marketing.