SONOTRACE® (Glycerine-free) General Purpose Couplants

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.

*Sonotrace 40 discontinued as of August 31, 2018 – Sonotrace 30 is the recommended replacement.


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We pride ourselves in providing fast deliveries. However inventory changes rapidly and on occasion some items may not be in stock. If you require an expedited shipment, please contact us via e-mail or call our office to confirm availability of an item. *Nominal lead times vary by product.

Product Information


  • Contains humectants to retard 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
  • Slower drying
  • Good price-to-performance value