Home / Electrical Infrastructure / Woven asbestos seals in fuse switch boxes Woven asbestos seals in fuse switch boxes Description Flexible woven (rope) asbestos seal fitted to interior of box housing or into flange inside door edging. Woven seal may vary in colour from white to grey to brown depending on age and environmental exposure. Brands/products WilcoOttomillFederalKelvin Years of production/use Prior to 1990 Residential uses N/A Industrial uses Industrial structures, electrical substations and installations, railway signal boxes Be aware Woven seal may become hard and brittle with age. Abrasion with other surfaces in contact may result in ACM debris in box.