Product Description
Johnson March Corporation supplied refractory crown block, back-up insulation, and seal cements for glass-melting tanks used in container, flat-glass, and specialty glass plants. According to publicly filed asbestos litigation records, Johnson March crown block back-up insulation and companion seal cements allegedly contained asbestos to withstand the extreme temperatures and long campaign lives of glass tank crowns. During cold-repair and hot-repair rebuilds, workers allegedly cut and set the crown block, packed asbestos seal cements around burner ports and tuck-stones, and later demolished the crown at end-of-campaign, allegedly generating airborne fibers during each phase.
Workers Exposed
Glass tank rebuilders, refractory masons, and bricklayers assigned to industrial specialty work allegedly worked closest to Johnson March crown block and companion asbestos-containing cements. Furnace-relining crews, industrial insulators, and kiln shutdown contractors allegedly encountered the same dust during shared tank shutdowns and end-of-campaign demolition.