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UT Couplant

Silver Bullet Couplants – for inspections that are almost impossible without the right couplant.

Many UT applications require a specialty UT couplant.  For difficult inspections that require high acoustic impedance, shear wave, reduced surface noise, extreme temperature range or extended service life for sensors, we have the right couplant.

High Impedance Couplant: A high impedance couplant typically has an acoustic impedance above 3.5 M Rayls.  Water based couplants typically have acoustic impedances between 1.5 and 1.8 M Rayls depending on the Glycerin content (0% glycerin at 1.5 M Rayls, 12% glycerin at 1.8 M Rayls, 100% glycerin at 2.4 M Rayls). 

The advantage of a high impedance couplant is that more of the acoustic energy is transmitted between the transducer (or delay line) and test object and less is reflected and scattered at the surface of the test object.  This is particularly important when:

  • The test object surface is very rough (porous cast iron, scale, rough grinding).
  • The contact area for the delay line or transducer is small (pencil point probes measuring pit depths).
  • Materials such as concrete which are high impedance, scatter acoustic energy and often have a rough surface.

There are currently two options for water-soluble, high impedance couplants:

  • Z+ MV, a medium viscosity Glycerin based couplant (which has an operating range of 0 to 200°F; however, its viscosity increases quickly with temperature below 45°F.
  • Z+ fluid– does not contain Glycerin and maintains a fluid viscosity down to sub-zero temperatures.

Normal Incidence Shear Wave Couplant:

Not to be confused with angle beam generated shear waves (which rely on refraction of a longitudinal beam), normal incidence shear wave transducers propagate the shear wave with the transducer perpendicular to the test object and do not rely on refraction.  A normal incidence shear wave couplant requires a very high viscosity, high elastic modulus to perform acceptably.  Currently there is one commercially available water-soluble couplant that meets this requirement: Echo Shear Wave Couplant

Flow Meter and Sensor Couplant:

For permanent or long-term use, a flow meter couplant should resist creep, have good resistance to weather and chemicals as well as a broad temperature range.  Water-based couplants are suitable only for short-term flow metering applications. Echo 8 ZH is not water-based and is an excellent couplant for flow metering sensors.

Cryogenic UT Inspection:

CryoSoniX is the only ultrasonic couplant for use in cryogenic applications such as refrigerated ethylene. With an operating range of -200˚ to 60˚F (-129˚ to 16˚C), CryoSoniX enables repeatable and reliable inspections.

Phased Array Wedge Couplant:

Forever Wedge is an ideal couplant for use between phased array or angle beam transducers and the wedge.  Forever Wedge couplant won’t leach out, is impervious to water and couplants and when applied correctly, often lasts the life of the wedge or until it is replaced.  Forever Wedge eliminates phased array element drop out due to wedge couplant failure.

Mixing UT powder couplant doesn’t need to be complicated

EchoMix Single is a unique one-part powder ultrasonic testing couplant that easily mixes in cold water in 5 minutes. It is less expensive to ship than pre-mixed couplants, and it includes a special component to ensure uniform mixing.

Here’s more on what makes EchoMix Single stand out:

  • Its simple mixing process reduces errors. EchoMix Single takes the mixing error out of two-part powder packets by eliminating the chance that an inspector uses only one of two packets or reverses the packet mixing sequence. The easy-open packet requires no tools – no scissors, knives or attempted tearing of a sealed plastic bag. What’s more, EchoMix Single reduces waste by eliminating two extra plastic bags.
  • Low-cost couplants don’t need to have a high shipping expense. Why pay to ship water across the country when you can receive only the powder and add water yourself? EchoMix Single pre-measured packets give you the ability to mix 1 or 5 gallons of prepared couplant per packet. Even better, you can adjust the viscosity to get the exact thickness you prefer.
  • Worried about uniform mixing? Don’t be. EchoMix Single incorporates a food-grade blue pigment to insure complete mixing. The blue color is a visual marker to encourage thorough mixing and ensure uniform distribution of the corrosion inhibitor. EchoMix Single contains a mild corrosion inhibitor and a preservative, affording a five-year shelf life to the unopened packets.

The standard operating range for EchoMix Single is 32° F to 120° F (0° C to 50° C) in standard tap water. If you are working in cold environments, EchoMix Single can be winterized to -28° F (-33° C) by adding propylene glycol-based antifreeze.

EchoMix Single provides an economical solution for travel, remote-access inspections and storage limitations. It is a cost-effective, concentrated powder that can be mixed on the jobsite, and the compact and lightweight packet is easy to transport and store. EchoMix Single also is ideal to keep on hand as an emergency couplant for unanticipated shortages.

EchoMix Single benefits at a glance:

  • Accurate, one-packet, one-step mixing
  • Blue color tracer to insure complete mixing
  • Ferrous corrosion inhibition and preservative
  • Provides a strong, continuous coupling film that adheres well to vertical and overhead surfaces without dripping
  • Reduced surface tension; provides good wetting characteristics
  • Salt-resistant formulation; no loss in viscosity on corroded surfaces, marine parts or on boilers with salt cake
  • Low environmental impact; contains no phosphates or formaldehyde and doesn’t produce a strong odor or eye irritant from off-gassing
  • Compact for shipping and storage

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.

HiTempco-Ultrasonic-Couplant

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.

Packaging:

2-oz tube

1-quart

1-gallon

Contact us today for complementary samples:  sales@echoultrasonics.com or 360.671.9121