Ultrasonic inspection of very rough or pitted cast iron or weld surfaces can be challenging.  A rough or pitted surface can reduce the energy transmitted into the part, thus reducing the amplitude of the received signal. Additionally, there can be considerable scattering or noise. Both factors impact signal to noise ratio and the ability to identify defects in the material.

To  address these common issues, select a couplant with a high acoustic impedance to increase signal transmission and reduce noise or scattering.

Echo Z+ couplant has the highest acoustic impedance commercially available (3.7 MRayls), is water-soluble and available in five viscosities, each designed for different applications.

If you are performing pencil point inspection at temperatures under 50°F / 10°C, Echo Z+ LOW viscosity is preferred.  The viscosity of all grades of Z+ thicken with lower temperatures. Echo Z+ LOW viscosity dispenses from a plastic bottle, and is fluid down to 0°F / -17°C.

Or, if you are inspecting a very rough, pitted warm pipe or in summer’s hot sun, Echo Z+ VERY HIGH viscosity is best, as it will maintain a high viscosity at elevated temperatures.

For more information, visit: https://www.echoultrasonics.com/product/echo-z-couplant/