Velocity Table

This table provides estimated ultrasonic velocities for longitudinal waves in common materials. These values can be used with ultrasonic thickness gauges. However, it's important to remember that the actual velocity in a material can vary depending on several factors.

• Specific composition or makeup of the material
• Microscopic structure
• Grain or fiber direction (if applicable)
• Presence of any air pockets (porosity)
• Temperature

This variation is especially noticeable in cast metals, fiberglass, plastics, and composite materials.

For the most accurate thickness measurements, Dakota recommend to calibrate the sound velocity using a sample of the test material with a known thickness.