General-Purpose Ultrasonic Couplant 

Sonotrace® 30 is a general-purpose ultrasonic couplant in medium-thick gel viscosity for flaw detection and thickness gauging applications. This glycerin-free couplant is a great choice for applications requiring minimum halogens, sulfur and low melting point metals, and offers good performance at a lower price point.


  • Contains humectants to slow drying for longer inspection time
  • Very good corrosion inhibition
  • Nuclear grade Good surface wetting to quickly cover oily or dirty surfaces
  • Water washable for easily removal
  • Silicone free
  • Glycerin free

Ordering Information 

1 gal / 3.78 L: 42-901

5 gal / 18.9 L: 42-905

55 gal / 208 L drum: 42-955

Product Properties 

NDT Type: Ultrasonic Testing

Viscosity: 4.5

Compatibility: Most composites and metals


Ideal Application: Aerospace inspections, Aircrafts, Airframes, Composites, Flaw detection, Nuclear inspections, Thickness gauging, Weld inspection


Standards: API, ASME, AWS

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  • Brand: Magnaflux
  • Product Code: 42-901, 42-905, 42-955
  • Availability: In Stock

Tags: Sonotrace, 42-901, 42-905, 42-955, Ultrasonic Couplant, Magnaflux