Product Description
Plaintiffs alleged in publicly filed U.S. asbestos personal-injury and wrongful-death litigation that National Vulcanized Fibre Company (NVF) — the Yorklyn, Delaware-headquartered vulcanized-fiber and industrial-laminate manufacturer — produced an asbestos-filled electrical-grade sheet as part of its heat-service and dielectric-service sheet-stock catalog. NVF was one of the two founding U.S. vulcanized-fiber majors alongside Continental Diamond Fibre (CDF), and one of the founding U.S. industrial-laminate producers.
NVF’s asbestos-filled electrical-grade sheet was allegedly formulated with asbestos fiber incorporated into the vulcanized-fiber and/or phenolic-laminate matrix as a reinforcing filler, extending dielectric performance, arc resistance, heat service, and dimensional stability beyond what unfilled cellulose vulcanized fiber or paper-phenolic laminate could deliver. The electrical-grade sheet was allegedly supplied to U.S. electrical-equipment manufacturers for transformer coil forms, motor-slot liners, motor commutator segment insulation, arc barriers and arc chutes, terminal-board insulators, switchgear barrier panels, die-cut washers, and gaskets.
Asbestos Content
Plaintiffs alleged in publicly filed litigation that NVF asbestos-filled electrical-grade sheet was manufactured with asbestos as an intentional and load-bearing constituent of the sheet — not an incidental contaminant. The asbestos fiber contributed dielectric strength, arc resistance, and heat resistance beyond what unfilled cellulose vulcanized fiber or paper-phenolic laminate could achieve, and stabilized dimensions under sustained thermal load in electrical service.
Once pressed and cured, electrical-grade sheet encapsulates the asbestos fiber within a rigid matrix. However, the bonded state of fibers in the finished sheet does not eliminate exposure risk. Asbestos fibers become releasable whenever the sheet is sawed, sheared, drilled, punched, die-cut, ground, sanded, filed, or machined during fabrication of washers, coil forms, motor liners, and arc barriers.
Workers Exposed
Litigation records allegedly document that industrial workers encountered NVF asbestos-filled electrical-grade sheet at multiple stages — from mill production through downstream fabrication and field electrical service:
- Sheet-line operations — impregnating, stacking, and press-curing laminate stock at NVF plants
- Stock receiving and handling — moving sheet stock through downstream fabrication plants
- Sawing, shearing, and blanking — cutting sheet stock to finished dimensions releases visible dust
- Punching and die-cutting — every washer, arc barrier, and motor liner punched from a sheet releases fiber
- Drilling, routing, and edge-finishing — every hole, cutout, and edge dress releases respirable dust
- Grinding and sanding — finishing operations produce the finest respirable fraction
- Assembly and installation — fitting washers, barriers, and coil forms during transformer, motor, and switchgear build-up
- Motor rewind and switchgear rebuild — field electricians sawing and drilling laminate panels during service work