Basalt Woven Fiber tadpole seal with 304 Stainless Steel Hollow Core.116 thick premium quality Basalt woven tape.304 Stainless steel Hollow Core. Temperature: 1200 F 649 C (continuous) 1400 F760 C (intermittent) - Tadpole seals are used in sealing oven doors, covers, ducts, dampers, panel joints and other applications where conformance to uneven flanges is required.- Basalt textiles and stainless steel have excellent resistance to most chemicals. Please call Gaskets Incorporated for specific application concerns.- Basalt Woven Fiber is an environmentally friendly alternative to fiberglass materials. With excellent tensile strength, excellent resistance to Acid and Alkali, High abrasive resistance and a high melting point. Basalt is made from an igneous rock originated from molten lava and is 100% Recyclable.