Spiral Wound Metal Gasket Material: Metal tape + Expanded Graphite / PTFE Spiral wound metal gasket : Spiral wound gasket (basic type) is made by superposing, ... asbestos (graphite, PTFE, mica, ceramic) tape used for special-purposed equipments.Equipment: It is used as static ... sealing material for pipeline, valve, pump, pressure vessel, condenser, tower, ...