United States Gasket Company Advertisement. (1944) Circa WWII. Asbestos boiler handhole & other gaskets for Babcock & Wilcox, Combustion Engineering, Edge Moor, Foster Wheeler, Heine and Ward.
Asbestos could be found in and around industrial and marine boilers. Examples include asbestos casing insulation, and manhole and handhole gaskets.
Steam: Its Generation and Use (1963). The Babcock & Wilcox Company. Diatomaceous-Earth-Base Blocks contained asbestos. Asbestos cloth and wood used for boiler covering.