Sherman + Reilly urethane-lined aluminum sheaves are made identically to polished-groove sheaves (above) except that a premium-grade polyurethane lining is cast-in-place on the sheaves’ conductor-contact surface. The properties of the urethane and casting it in place on the bare sheave together assure a high-precision profile of the lined sheave. The urethane’s formulation assures resiliency to cushion conductors, as well as assures hardness, high load-bearing capacity, impact resistance, abrasion resistance, resistance to compression-set, and resistance to oil, ozone, and other environmental – all of which contribute to long useful life, even under harsh field conditions. A-scale durometer hardness of the lining is 90-92.
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