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High Impedance Couplant:

A high impedance couplant typically has an acoustic impedance above 3.5 M Rayls. Water based couplants typically have acoustic impedances between 1.5 and 1.8 M Rayls depending on the Glycerin content (0% glycerin at 1.5 M Rayls, 12% glycerin at 1.8 M Rayls, 100% glycerin at 2.4 M Rayls).

The advantage of a high impedance couplant is that more of the acoustic energy is transmitted between the transducer (or delay line) and test object and less is reflected and scattered at the surface of the test object. This is particularly important when:

• The test object surface is very rough (porous cast iron, scale, rough grinding).
• The contact area for the delay line or transducer is small (pencil point probes measuring pit depths).
• Materials such as concrete which are high impedance, scatter acoustic energy and often have a rough surface.

There are currently two options for water-soluble, high impedance couplants:

Z+MV- a medium viscosity Glycerin based couplant (which has an operating range of 0 to 200°F; however, its viscosity increases quickly with temperature below 45°F.
Z+fluid– does not contain Glycerin and maintains a fluid viscosity down to sub-zero temperatures.

To contact Russell Fraser Sales NDT about Specialty UT Couplants | Echo Ultrasonics Silver Bullet use Get a quote.

High Impedance Couplant:

A high impedance couplant typically has an acoustic impedance above 3.5 M Rayls. Water based couplants typically have acoustic impedances between 1.5 and 1.8 M Rayls depending on the Glycerin content (0% glycerin at 1.5 M Rayls, 12% glycerin at 1.8 M Rayls, 100% glycerin at 2.4 M Rayls).

The advantage of a high impedance couplant is that more of the acoustic energy is transmitted between the transducer (or delay line) and test object and less is reflected and scattered at the surface of the test object. This is particularly important when:

• The test object surface is very rough (porous cast iron, scale, rough grinding).
• The contact area for the delay line or transducer is small (pencil point probes measuring pit depths).
• Materials such as concrete which are high impedance, scatter acoustic energy and often have a rough surface.

There are currently two options for water-soluble, high impedance couplants:

Z+MV- a medium viscosity Glycerin based couplant (which has an operating range of 0 to 200°F; however, its viscosity increases quickly with temperature below 45°F.
Z+fluid– does not contain Glycerin and maintains a fluid viscosity down to sub-zero temperatures.

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To contact Russell Fraser Sales NDT about Specialty UT Couplants | Echo Ultrasonics Silver Bullet use Get a quote.