Gaskets & washer in non metallic materials manufrs Manufacturers of gaskets & electrical insulating material. In addition, manufacturers of washers, including fibre, vulcanised fibre, non-metallic, nylon, rubber & plastic ISO 9002 Cert. No: Q5939 Manufacturers of gaskets & electrical insulating material. In addition, manufacturers of washers, including fibre, vulcanised fibre, non-metallic, nylon, rubber & plastic