HEAT-RESISTANT SEALANT, ENDLESS SEALING MEMBER USING THE SAME, AND DOWNHOLE UNIT FURNISHED WITH ENDLESS SEALING MEMBER

摘要

A heat-resistant seal material 130a and 130b of the invention includes 100 parts by weight of a ternary fluoroelastomer, 1 to 30 parts by weight of vapor-grown carbon fibers having an average diameter of more than 30 nm and 200 nm or less, and carbon black having an average particle diameter of 25 to 500 nm. The heat-resistant seal material 130a and 130b contains the vapor-grown carbon fibers and the carbon black in an amount of 20 to 40 parts by weight in total. The heat-resistant seal material 130a and 130b has a compression set when subjected to a compression set test at a compression rate of 25% and a temperature of 200°C for 70 hours of 0 to 15% and a dynamic modulus of elasticity at 200°C (E'/200°C) of 30 to 100 MPa.