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Fibre washers are thin disk-shaped devices with central holes that compensate uneven surfaces to create a seal. Also referred to as tap washers, they are made of vulcanized fibre that naturally expands when wet, making them excellent sealants in tap assemblies. Fibre tap washers are widely used in plumbing applications to prevent leakage or contaminant ingress. However, these vulcanized fibre washers are also used in electrical insulation, automotive, aviation, and lighting industries.