Sound Velocities Of Common Materials - Elcometer CG60DL Operating Instructions Manual

calibrated for mild steel pipe and measures through both materials, the actual coating thickness will appear
to be 2.5 times thicker than it actually is, as a result of the differences in sound-velocity.
The error can be eliminated by using the echo-echo mode to perform measurements for applications such
as these. In echo-echo mode, the paint/coating thickness will be eliminated entirely and the steel will be the
only material measured.

19 SOUND VELOCITIES OF COMMON MATERIALS

Material
Aluminium
Bismuth
Brass
Cadmium
Cast Iron
Constantan
Copper
Epoxy Resin
German Silver
Glass, Crown
Glass, Flint
Gold
Ice
46
Sound Sound
velocity (m/s) velocity (in/µs)
6350 0.250
2184 0.086
4394 0.173
2769 0.109
4572 0.180 (Approx.)
5232 0.206
4674 0.184
2540 0.100 (Approx.)
4750 0.187
5664 0.223
4267 0.168
3251 0.128
3988 0.157
Material
Paraffin
Platinum
Plexiglas
Polystyrene
Porcelain
PVC
Quartz Glass
Rubber, Vulcanised
Silver
Steel
Steel, Stainless
Stellite
Teflon
Sound Sound
velocity (m/s) velocity (in/µs)
2210 0.087
3962 0.156
2692 0.106
2337 0.092
5842 0.230 (Approx.)
2388 0.094
5639 0.222
2311 0.091
3607 0.142
5918 0.233
5664 0.223
6985 0.275 (Approx.)
1422 0.056