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Precision Acoustics


A high-performance composite material designed for transducer backings operating under elevated hydrostatic pressures at 200 kHz and above.

If you have any specific questions about this product, please contact us.

tbw650 tile


TBW650, from Precision Acoustics Ltd, is two-phase material acoustic composite with high-density, rubbery inclusions embedded within a syntactic foam matrix. It has been designed specifically for use as a low frequency transducer backing to minimise backing reflections, whilst being able to withstand elevated hydrostatic pressures.

Download the data sheet

TBW650 makes an ideal material for use as a transducer backing material in underwater acoustic transducers.

Backing reflections are very effectively suppressed in only a few millimetres of material. For example, 10 mm of TBW650 introduces 60 dB of absorption at 300 kHz.

Physical specification

  • Excellent insertion loss and absorption
  • Acoustic de-coupling and isolation
  • Ability to withstand elevated hydrostatic pressures
  • No toxic constituents
  • Long term stability of acoustical and mechanical properties

Typical properties

Appearance Blue with black chips
Dimensions of standard tile 305 mm x 240 mm x 26.5 mm
Shore D hardness (matrix) 70 ± 3
Shore A hardness (filler) 86 ± 3
Density 2917 ± 30 kg / m3
Average wave speed (200 – 700 kHz) 1151 ± 30 m / s
Acoustic impedance 3.08 MRayls
Hydrostatic crush strength 65 MPa / 9427 psi
Equivalent ocean failure depth 6630 meters / 21,751 feet
Operating temperature of cured material 100 °C (long-term)
125 °C (short-term)