Topog-E Series 3000 gaskets are specially designed for inspection ports of boilers and tanks. They provide reliable sealability with this low stress and exceptional dimension stability. This form of gasketing is processed by expanding 100% pure polytetrafluoroethylene (PTFE). The result is a bidirectional, soft, highly compressible gasket for longer life and trouble-free sealing. Its form-in-place versatility is perfect for sealing boilerplates that are worn, warped, or scored. The high compressibility of the Topog-E Series 3000 gasket enables it to effectively fill flange imperfections for a tight, leak-free seal. Unlike conventional PTFE which is prone to cold flow, Topog-E Series 3000 has good creep resistance and bolt torque retention properties.