Magnaflux Ultrasonic Couplant Soundsafe

High Performance Ultrasonic Couplant

Soundsafe® is a high-performance, general-purpose ultrasonic couplant for flaw detection and sizing, thickness gauging, flow metering and acoustic emission testing.

This medium viscosity gel couplant is well known for its outstanding performance, excellent corrosion protection, thixotropic properties and comprehensive range of specifications and approvals.

Soundsafe is Pratt & Whitney approved and meets nuclear grade specifications for halogen and sulfur levels.


  • Wide range of specifications and approvals
  • Great surface wetting
  • Thixotropic gel
  • Non-toxic, non-irritating formula
  • Increased acoustic impedance reduces surface noise
  • Good surface wetting for fast, even coverage
  • Clings well to most vertical and overhead surfaces
  • Highest corrosion inhibition
  • Provides good transducer lubrication
  • Slower drying for extended inspection time
  • Nuclear grade
  • Aerospace approvals
  • Hydrogen embrittlement testing
  • Specifications 
  • Container Size & Part Number 
  • Applications 
  • Use Recommendations 


  • API
  • ASTM F519
  • ASME
  • AWS
  • ASTM F945
  • PWA 36604
  • Pratt & Whitney PMC 4385

Container Size & Part Number

4 fl oz / 118 mL bottles (case of 12)     20-904

12 fl oz / 354 mL bottles (case of 12)   20-912

1 gal / 3.78 L cubitainer                        20-901

5 gal / 18.9 L cubitainer                        20-905

55 gal / 208 L drum                              20-955


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Defect location: subsurface

Ideal for:

  • Flaw detection
  • Thickness gauging
  • Flow metering
  • Acoustic emission testing
  • Vertical or overhead surfaces
  • Bridge pins, welds, anchor bolts
  • Weld inspection
  • Rough surfaces
  • Fiberglass
  • Plastic
  • Titanium
  • Aerospace inspections
  • Nuclear inspections


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Use Recommendations

NDT Method: Ultrasonic Testing

Required Equipment: UT equipment, transducer

Temperature Range: 0 to 200°F / -18 to 93°C

Compatibility: Most composites and metals


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