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The first and only high temperature ultrasonic couplant that has an auto-ignition temperature and flash point above 1300ºF. With no minimum operating range, no residue, less smoke and no auto-ignition under 1300ºF, EchoTherm Extreme is an ideal couplant for port inspections. EchoTherm Extreme is a high viscosity paste that adheres well to the transducer.