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New Fluids for NDT can eliminate fire, smoke and residue

Echo Ultrasonics has recently become the exclusive distributor of SpectrumGlide AUT-NDT Fluid Couplant in the U.S. and Canada.

Photo courtesy of Dave Bajula, Advanced NDT Services, ACUREN

SpectrumGlide, developed by Eclipse Scientific, has a viscosity formulated to reduce runoff and provide longer dwell time at temperatures from -50° F to 730° F (-45° C to 387° C).

The addition of SpectrumGlide  gives Echo Ultrasonics a full range of automated ultrasonic testing fluids, with viscosities ranging from 125 to 5000 cps and covering temperatures from -70° F to 1200° F (-57° C to 649° C).

SpectrumGlide’s formulation results in faster and more efficient testing by allowing it to remain on pipes, tanks and other surfaces longer without draining off. Because it can be used in testing environments up to 780°F (415°C), it’s a versatile fluid for high-temperature AUT applications.

To learn more about SpectrumGlide, or to give it a trial in your testing, contact us. Free samples are available for evaluation; just fill out this short form online.

AUT uses automatic equipment to run a variety of inspections in numerous industries, from corrosion mapping to thickness gauging to weld inspection. For example, AUT is an efficient and accurate method for analyzing the integrity of pipeline welds in the oil and gas industry.

50 years of developing and manufacturing the world’s leading NDT ultrasonic couplants enable Echo Ultrasonics to provide customers with the most cost-effective, highest-performance and safest couplants for each application. Let us recommend and provide samples of the right couplant with today’s technology for your specific needs.

Echo Ultrasonics Photo Contest – everyone wins

  • Submit a photo of an ultrasonic couplant in use. Manual UT, AUT scanners, port inspections, pipes, tanks, ….. if you’re inspecting it, we want to see it.
  • Describe the application, including the couplant (operating range, what is being tested, anything difficult or unusual about the inspection, environment, material, etc…).
  • Submit by email to or by text to 360.510.3503
  • Submission grants permission to use photos on our website, LinkedIn and Blog posts. Names (personal or corporate) will not be published.
  • Everyone who submits a photo will receive:
    • The Fisher Space Pen is able to write in zero gravity and works upside down, under water, over grease and in extreme temperatures. This is the pen that was on the Apollo NASA mission in 1968 and it has flown on every manned US space mission since. The refills last 3X longer than most pens.
    • Rite in the Rain Top-Spiral Notebook is small enough to fit comfortably in your pocket and tough enough to survive sweat, rain, mud, snow, oil, grease, and the wear-and-tear of daily use in your pocket.
    •  One grand prize winner will be selected each month to win an Ultimate Ears WONDERBOOM Super Portable Waterproof Bluetooth Speaker.  Five grand prize winners total.

Echo Ultrasonics Couplant Solutions Center: We are committed to providing the highest-performance, safest couplants and to helping you select the right couplant for every application. We have been the couplant experts for over 50 years.  Browse our website today or call or email today for free samples.

Looking for the right fluid for your AUT Inspections?

Echo’s automated ultrasonic testing fluids offer solutions for those who’ve encountered problems with other fluids. Often, fluids are too thick to pump, run off too fast, smoke too much, auto-ignite, freeze or vaporize so quickly that there’s no time to conduct the inspection.

With AUT fluids in multiple viscosities (thicknesses) spanning a broad range of temperatures, Echo has solutions to each of these problems. Several Echo AUT fluids are water-soluble, too, so they don’t leave a film on water when used at sea.

Echo AUT fluids have viscosities ranging from 125 to 5000 cps and covering temperatures from  -70° F to 1250° F (-57° C to 675° C).

The five AUT fluids listed below are arranged by increasing Operating Range:

Echo 4HT is a water-soluble fluid with an operating range of -70° F to 450° F (-56° C to 230° C). It has low toxicity and good surface wetting. Echo 4HT is slow drying and is compatible with a broad range of materials, including most metals, plastics and composites.

VersaSonic fluid is a plant-based, biodegradable fluid with low toxicity and an operating range of -10° F to 700° F (-23° C to 371° C). Above 400° F (200° C), VersaSonic works best when sprayed or pumped (discharged) at the point of use.

Echo 8HT  features minimal residue in a broad range of AUT and MUT ultrasonic flaw- and thickness-gaging applications, from -50° F to 800° F (-45° C to 425° C). The Echo 8HT line is compatible with all metals and most plastics. Echo 8 HT is available in three viscosities: grades 1, 4 and 10.

SpectrumGlide, a high-performance fluid for high-temperature testing, has a viscosity formulated to reduce runoff and provide longer dwell time at temperatures from -50° F to 730° F (-45° C to 387° C). SpectrumGlide was developed by Eclipse Scientific and is distributed under license by Echo.

EchoTherm Extreme fluid is the highest-temperature fluid couplant available. EchoTherm Extreme is a high-viscosity fluid that produces less smoke and minimal residue. It has the broadest operating range, from -40° F to 1250° F, and its auto-ignition point is above 1300° F (704° C).

No matter the testing environment or application, it’s likely that Echo Ultrasonics has — or can develop — just the right couplant. Give the Echo experts a call to find the right couplant for your needs or to request a sample.

ASNT Annual Conference a big success

Thanks to everyone who visited with us at ASNT in Nashville.

Couplant sample requests are being entered and we will be in touch soon.  We had many discussions regarding the use and success of EchoPure for Phased Array inspections.   EchoPure is the solution for phased array element drop out and the resulting difficulty in reproducing flaw indication.   The water-free formulation and strong coupling film of EchoPure provides a continuous film between the part and the transducer and resists “air gap puddling” which is common with couplants containing water.  

For more information, visit our EchoPure webpage or download the datasheet from Resources.



Why VersaSonic™ outperforms Sono 600®

Vaporization of VersaSonic vs Sono 600®


The above plot is a technical representation of why VersaSonic (top line) outperforms Sono 600 (bottom line).  The plot depicts the weight loss of each couplant due to vaporization over time at 200°C (392°F).  Sono 600 loses significantly more mass and vaporizes faster than VersaSonic.  Vaporization produces gas bubbles which both attenuate and scatter ultrasound as well as degrades the rheology of the product (coupling doesn’t last as long, dries faster and gets sticky or tacky sooner).

While many Echo customers that have switched to VersaSonic from Sono 600 have observed these characteristic in practice, this test demonstrates the technology behind the experience.

VersaSonic is the ideal high temperature ultrasonic couplant when working under 750°F (400°C).  The response is instant as there are no plastic polymers in VersaSonic that need to melt before transmission occurs. At higher temperatures (above 350°F / 177°C) its useful service life is longer than competitive couplants.  The auto-ignition temperature for VersaSonic is 788°F (420°C). VersaSonic is available in two viscosities:

  • High Viscosity – ideal for spot inspections
  • Medium Viscosity – best for spreading

For more information, samples and ordering information, click here or call 360.617.9121.

New UT Fluid Couplant Grades

We’ve expanded our line of Echo 8HT fluid UT couplant to include three additional viscosities.  Performance of a broad range of AUT and MUT ultrasonic flaw and thickness gaging applications from -50°F to 800°F (-45°C to 425°C) is possible with these four grades, with minimal residue and great signal to noise ratio.  

Grade 1 is the lowest viscosity fluid (100 cST) for long or small diameter lines and quick spreading.

Grade 4 is Echo’s standard viscosity fluid (400 cST) and is usually a good compromise between pump ability and run-off at the transducer.

Grade 6 is a higher viscosity fluid (850 cST) that minimizes run-off at the transducer, however, requires system “pump ability” testing.

Grade 10 is a very thick fluid (5,000 cST – honey like) for MUT.  It spreads easily over large hot surfaces, stays in place and leaves minimal if any residue.


Echo 8HT

Introducing HiTempco™ UT Couplant

Introduced in the mid 1970’s by Aerotech / Krautkramer Branson and sold by GE Inspection Technologies for decades,  HiTempco has been the standard of performance in silicone based ultrasonic couplants.  With a broad temperature range of -50°F to 775°F (-45°C to 412°C), its applications range from high temperature thickness gauging and flaw detection to ambient and low temperature coupling where no corrosion, broad material compatibility, long service life and low toxicity are considerations.


Product Description

  • Very high viscosity
  • No residue
  • Non-drying
  • Strong corrosion inhibition
  • Non-toxic, non-irritating
  • Low environmental impact.
  • Contains no perfluorocarbons, peanut or tree nut oils.

Operating Range:

-50°F to 775°F (-45°C to 412°C)

Flash Point and Auto-Ignition Temperature

Flash Point:  Cleveland Open Cup 250°F

Auto-Ignition Temperature:  820°F

Instantaneous ultrasonic response (does NOT contain plastic powders which delay ultrasonic conduction and result in difficult-to-remove residues). Excellent corrosion inhibitor. Provides non-toxic, long-term corrosion inhibition for steel and cast iron and is compatible with other metals and most plastics. HiTempco may be left in place unless it will interfere with subsequent manufacturing operations such as painting or electroplating.

Removal: wipe with paper or cloth rag. If complete removal is required, dish detergent and water or a chemical degreaser can be used.


2-oz tube



Contact us today for complementary samples: or 360.671.9121

ISO 9001:2015 Certification Achieved

ISO 9001:2015 Certificate awarded to Echo personnel

Echo Ultrasonics is the first NDT ultrasonic manufacturer to be awarded the new Certified Quality System ISO 9001:2015.  Echo develops, formulates and manufactures NDT ultrasonic couplants for the worldwide non-destructive testing industry.  Early adoption of the ISO 9001:2015 quality standard demonstrates Echo’s efforts to be leaders in the ultrasonics industry.

Emily Larson-Rutter, Quality Manager of Echo Ultrasonics said, “The new ISO 9001:2015 is a High Level Structure (HLS) which provides a framework for incorporating other quality standards (such as the newly issued AS9100:2016-D).  ISO 9001:2015 places additional emphasis on leadership and management commitment being actively engaged and taking accountability for the effectiveness of the company’s Quality Management System.  Adherence to ISO 9001:2015 quality standard requires employees to use critical thinking skills focusing on risk.”

As part of the new ISO 9001:2015 certification process, Echo Ultrasonics engaged in a rigorous 3rd party audit of its risk identification and abatement infrastructure, administration and manufacturing processes, as well as customer and product quality requirements. Achieving ISO 9001:2015 certification reflects Echo’s dedication to quality and highlights our structured and systematic approach to the design, development, manufacture and distribution of ultrasonic couplants.

VersaSonic Ultrasonic Couplant

VersaSonic Couplant

You may be aware that VersaSonic® has superior performance from -10 to 750°F, however, did you know:

  • VersaSonic is available in medium viscosity for optimal spread-ability and high viscosity to “stay in place” on a transducer, pipe or overhead surface.
  • VersaSonic is available in open-top 1 and 5-gallon pails (5-gallon dispensing pump included at no charge), 1 gallon and quart cubitainers.
  • VersaSonic is a versatile broad temperature couplant. The world’s largest producer of power generating equipment has standardized on VersaSonic for use at ambient temperatures due to its compatibility with their electronic components.
  • Refineries and heat treatment plants use VersaSonic because its useful service life is up to three times longer than competitive couplants at temperatures above 350°F.

Have a job where you need to spread the couplant in some areas but need it to stay in place in others?  Try our quart dual pack of both viscosities.

Testing above 750°FEchoTherm and EchoTherm Extreme are the only ultrasonic couplants with operating ranges above 850°F.

Check out our complete line of high temperature couplants online