Couplant Selection Chart

All Echo Ultrasonics® couplants have been formulated with operator safety and environmental regulations as a priority.

Download chart as pdf here

  Couplant Key Benefits Viscosity Temperature
Range
Corrosion
Characteristic

 

ambient-temperature-ultrasonic-couplant-comparison

 

 

ambient-temperature-ultrasonic-couplant-comparison

UltraSoniX™

  • Glycerin-free, in accordance with FAA Advisory Circular issued 9/20/2013 AC 25-29
  • Overhead/vertical application (medium and high viscosity)
  • Slow drying
  • Fast wetting
  • No nitrates, nitrites, glycol ethers or formaldehyde
  • Water soluble, acrylic polymer, least residue
High
Medium
10° to 220°F
-12° to 104°C
Very good
Meets ASTM F519

EchoTrack™

  • Economical high-performance
  • Overhead/vertical application (medium & high viscosity)
  • Slow drying
  • Fast wetting
  • No nitrates, nitrites, glycol ethers or formaldehyde
  • Water soluble, acrylic polymer, least residue
High
Medium
18° to 180°F
-8° to 82°C
Very good

EchoPure™

  • Couplant of choice for Phased Array Manual UT Inspection (PAMUT). Eliminates dry spots under the wedge and resulting element drop out. Improves defect reproducibility.
  • Complies with P91 steel inspection requirement for a water-free couplant.
  • Broadest temperature range for water-soluble couplants
  • No couplant build up which can result in false indications.
  • Very slow drying and salt stable
  • Overhead / vertical application
  • Excellent transducer lubrication
High
Medium
Low
Fluid
-60° to 350°F
-51° to 176°C
Very good
Meets ASTM F519

SoniX™

  • Salt stable (boiler and corrosion salts, etc.)
  • Strong lubricious coupling film
  • Fast Wetting
  • No nitrates, nitrites, glycol ethers or formaldehyde
  • Glycerin-free
  • Water soluble, cellulose based
High
viscosity fluid
40,000 cps
18° to 120°F
-8° to 50°C
Very good
Meets ASTM F519 

ECONOgel™

  • Most economical UT water-soluble couplant
  • Glycerin and silicone-free
  • Completely salt stable
Medium Viscosity 26° to 120°F
-3.3° to 48°C
Good

Glycerin

  • Packaged from UPS Glycerin, 99+%
  • Will not harden on equipment
  • Pumpable fluid
  • Boiling point 555°F / 290°C
  • Compatible with plastics
Low viscosity
fluid
65° to 500°F
18° to 260°C

Can be corrosive to carbon steel and aluminum. No corrosion effects in most plastics, fiberglass, or composites.

powder-ultrasonic-couplant

EchoMix®
Powder 

  • Powder couplant easily mixed in water
  • Good wetting
  • Salt resistant
  • No formaldehyde
  • Compact for shipping and storage
  • Water soluble
  • Operating range can be extended with propylene glycol antifreeze
Medium gel
23,000 cps
Adjustable
low to high
32° to 120°F
0° to 50°C
Mild, short term
ferrous corrosion inhibition
high-temperature-ultrasonic-couplant-comparison

VersaSonic®

  • Broad operating range – subzero to 700°F
  • Best performing UT couplant between 300 and 750°F
  • Fast Response, no wait time
  • Low smoke / Low toxicity / No char residue
  • Does not contain peanut oil
Gel and
paste 
-10° to 700°F
-23° to 371°C
Best long-term corrosion protection. Meets ASTM F519

HiTempco

  • Less smoke than VersaSonic
  • No residue or varnish
  • Fast response, no wait time
  • Excellent corrosion inhibition
  • Non-toxic, non-irritating
Paste -50° to 775°F
-45° to 412°C
Excellent corrosion inhibition

EchoTherm™

  • Most economical ultra-high temperature couplant for use above 700°F and in ports.
  • EchoTherm contains a plastic polymer which melts and begins to smoke at 750°F
  • Leaves plastic residue (char)
Paste 200° to 1000°F
93° to 538°C
N/A

EchoTherm Extreme™

  • Highest performance extreme temperature couplant
  • Fast Response, no wait time
  • No plastic polymer
  • No plastic char residue
  • Broadest operating range
  • Low smoke
Paste

-40° to 1250°F
-40 to 675°C

Meets ASTM F519
pumpable-fluid-ultrasonic-couplant

VersaSonic Fluid

  • Excellent corrosion inhibition
  • Broad operating range
  • Low toxicity
  • Does not contain peanut oil
  • Easily removed with Echo 4HT
  • Auto-ignition temperature: 788°F/420°C
Fluid

-10° to 700°F
-23 to 371°C

Excellent
Meets ASTM F519

Echo 8 HT™

  • Broadest operating range
  • Three Viscosities: thin to very thick liquid for AUT and MUT
  • Minimal smoke
  • Excellent lubricant
  • Low toxicity / Non-irritating
  • Auto Ignition is 850°F/454°C
Fluid  -50° to 800°F
-45° to 425°C
Excellent

SpectrumGlide

  • Increased viscosity for improved stability and decreased run off at higher temperatures
  • Minimal residue, minimal smoke
  • Low toxicity
  • Non-irritating
  • Auto-ignition temperature: 752°F/400°C
Fluid

-50° to 730°F
-45° to 387°C

Excellent
  Couplant Key Benefits Viscosity Temperature
Range
Corrosion
Characteristic