TBW650
A high-performance composite material designed for transducer backings operating under elevated hydrostatic pressures at 200 kHz and above.
Overview
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) |