Chemical Classification
Synthetic polymer materials formed by a hydrosilylation reaction between vinyl-functional and hydride-functional siloxanes provide excellent dimensional stability without emitting corrosive byproducts. An addition-cure elastomer undergoes cure at room or elevated temperature when catalyzed by a platinum compound. The absence of volatile reaction products prevents shrinkage and ensures the material retains its molded volume during sensor packaging.
Material Stability
Cure chemistry dictates the performance of the rubber when used as a potting compound for delicate electronics. This material is crosslinked without weight loss, meaning zero internal stress is generated from evaporation. In contrast to condensation-curing polymers, the platinum-catalyzed system does not release acetic acid or alcohol which could attack transducer traces.
Performance Limit
Catalytic poisoning remains a primary failure mode during the potting process. Certain compounds containing sulfur, nitrogen, or tin can inhibit the platinum catalyst and leave the elastomer uncured. Such failures are verified during production by auditing the hardness of the compound at specified cure intervals.
Production Metric
Hardness values and shore durometer measurements determine the suitability of the compound for damping applications. A higher hardness increases the mechanical coupling to the sensor housing. This relationship influences the resonant frequency of the transducer assembly.
