Product Description

Johns-Manville Marinite was a family of rigid structural panels used aboard U.S. Navy warships, submarines, and merchant vessels as fire-rated joiner bulkheads, overhead panels, engine-room linings, and boiler casing liners. According to publicly filed asbestos litigation records, the panels allegedly contained asbestos fiber bound in a calcium-silicate and Portland-cement matrix engineered to meet Navy MIL-spec fire-resistance requirements. Cutting Marinite to fit around penetrations, drilling for fasteners, and demolition during shipboard overhauls allegedly released respirable asbestos dust.

Workers Exposed

  • Shipyard boilermakers and pipefitters cutting Marinite around pipe and cable penetrations
  • Marine insulators applying and removing Marinite in machinery spaces
  • Navy machinist mates and boiler technicians demolishing bulkhead panels during rip-out and overhaul
  • Joiners and carpenters installing fire-rated Marinite bulkheads at berthing and passageway boundaries