The majority of NDT Testing applications require ultrasonic couplant to be used in order to facilitate the transmission of sound waves between the transducer (resting equipment) and the piece being tested.

Overall Couplants are non-toxic gels, pastes or liquids. Their use within Ultrasonic NDT is crucial as ultrasonic frequencies do not transmit adequately through “the air” and even tiny gaps between the transducer and the test piece/material can result in acoustic impedance, therefore inhibiting the resting procedure and the results.

Sonatest manufactures and supplies a range of ultrasonic couplants covering a spectrum of end-user requirements.