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Speed of Sound Through Materials
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Elcometer Ultrasonic Thickness Gauges can be calibrated by the user for the appropriate material in two ways:
- Set the calibration to the thickness of the known standard of the same material
- Set the frequency calibration to the appropriate value using the velocity chart below
The Elcometer 204 is pre-calibrated for Steel only.
|
Material |
km/sec |
in/msec |
Material |
km/sec |
in/msec |
Air |
0.33 |
0.013 |
Neoprene |
1.60 |
0.063 |
Aluminium (2024-T4) |
6.38 |
0.251 |
Nickel |
5.64 |
0.222 |
Beryllium |
12.88 |
0.507 |
Nylon |
2.69 |
0.106 |
Boron Carbide |
10.92 |
0.430 |
Platinum |
3.69 |
0.156 |
Brass |
4.39 |
0.173 |
Plexiglass |
2.69 |
0.106 |
Cadmium |
2.77 |
0.109 |
Polystyrene |
2.34 |
0.092 |
Copper |
4.65 |
0.183 |
Polyurethane |
1.78 |
0.070 |
Glass (Plate) |
5.77 |
0.227 |
PVC |
2.39 |
0.094 |
Glycerine |
1.93 |
0.076 |
Quartz |
5.74 |
0.226 |
Gold |
3.25 |
0.128 |
Silver |
3.61 |
0.142 |
Inconel |
5.82 |
0.229 |
Steel (4340) |
5.84 |
0.230 |
Iron |
5.89 |
0.232 |
Steel (303 Stainless) |
5.66 |
0.223 |
Iron, Cast |
4.55 |
0.179 |
Teflon |
1.52 |
0.060 |
Lead |
2.16 |
0.085 |
Tin |
3.33 |
0.131 |
Magnesium |
5.84 |
0.230 |
Titanium |
6.10 |
0.240 |
Mercury |
1.45 |
0.057 |
Tungsten |
5.18 |
0.204 |
Molybdenum |
6.25 |
0.246 |
Uranium |
3.38 |
0.133 |
Monel |
5.36 |
0.211 |
Water |
1.47 |
0.058 |
Motor Oil (SAE 30) |
1.75 |
0.069 |
Zinc |
4.32 |
0.170 |
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