Magnaflux Ultrasonic Couplant Sonotrace

General-Purpose Ultrasonic Couplant

Sonotrace® is a general-purpose ultrasonic couplant 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 comes in two different viscosities, Sonotrace 30 which is a medium-thick gel and Sonotrace 40 which is slightly more viscous.


  • 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
  • Specifications 
  • Container Size & Part Number 
  • Applications 
  • Use Recommendations 


  • API
  • ASME
  • AWS

Container Size & Part Number

Sonotrace 30

1 gal / 3.78 L cubitainer      42-901

5 gal / 18.9 L cubitainer      42-905

55 gal / 208 L drum            42-955


Sonotrace 40

1 gal / 3.78 L cubitainer      43-901

5 gal / 18.9 L cubitainer      43-905

55 gal / 208 L drum            43-955


Locate a Distributor


Defect location: subsurface

Ideal for:

  • Thickness gauging
  • Flaw detection
  • Aerospace inspections
  • Nuclear inspections
  • Composites
  • Weld inspection
  • Aircrafts
  • Airframes


Contact Us

Use Recommendations

NDT Method: Ultrasonic Testing

Required Equipment: UT equipment, transducer

Temperature Range: 25 to 175°F / -4 to 79°C

Compatibility: Most composites and metals


Locate a Distributor

Please wait while we gather your results.

Related Products

Magnaflux Ultrasonic Couplant Echogel


Economical couplant

Magnaflux Ultrasonic Couplant Soundclear


High-value couplant

Magnaflux Ultrasonic Couplant Soundsafe


High-performance couplant

Magnaflux Ultrasonic Couplant Ultragel II

Ultragel II

High-performance couplant

Subscribe to Magnaflux News:


155 Harlem Avenue
Glenview, IL 60025, USA
Telephone: +1 847-657-5300
Fax: +1 847-657-5388
Contact Magnaflux Customer Service

Select Your Country North America Mexico Brazil China Europe Russia India New Zealand, Australia, Japan, Southeast Asia
© 2016 Magnaflux - all rights reserved.

We have placed cookies on your computer to give you the best possible experience with our website. These cookies are also used to ensure we show you advertising that is relevant to you. If you continue without changing your settings, you are agreeing to our use of cookies to improve your user experience. You can click the cookie settings link on our website to change your cookie settings at any time.