Couplant Selection Chart

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

Ambient Temperature Couplant Comparison

	Couplant	Key Benefits	Viscosity	Temperature Range	Corrosion Characteristic
	SuperSoniX™	Expanded Ambient Temperature Gel couplant, not stringy or sticky Viscosity remains in place for overhead and vertical surfaces Broad operating range Slow drying Water-soluble Improved stability against corrosion salts	Medium and High	-10 to 220°F -23° to 104°C	Very good
	Signal™	Improves signal to noise ratio on rough surfaces such as castings, rough bar stock and fiberglass Highest acoustic impedance of any water-based ultrasonic couplant Slow drying Water-soluble	Medium	-18° to 224°F -28° to 107°C	Very good
	UltraSoniX™	Glycerin-free, in accordance with FAA Advisory Circular AC 25-29 Slow drying, Fast wetting Water soluble	Medium	10° to 220°F -12° to 104°C	Very good Meets ASTM F519
	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 Glycerin-free Water soluble, cellulose based	Medium	18° to 120°F -8° to 50°C	Very good Meets ASTM F519
	Glycerin	GE approved for the inspection of CFM56-7B engine fan blades in accordance with service buletin SB72-1033 Packaged from UPS Glycerin, 99+% Will not harden on equipment Pumpable fluid Compatible with most plastics	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 Couplant Comparison

	Couplant	Key Benefits	Viscosity	Temperature Range	Corrosion Characteristic

	EchoMix^® Single	ONE PART powder Easily mixed in water Salt resistant No formaldehyde Compact for shipping and storage Water soluble Operating range can be extended with propylene glycol antifreeze	Medium gel Adjustable low to high	32° to 120°F 0° to 50°C	Mild, short term ferrous corrosion inhibition

Speciality Couplant Comparison

	Couplant	Key Benefits	Viscosity	Temperature Range	Corrosion Characteristic
	Forever Wedge Couplant™	High viscosity fluid for phased array and angle beam wedge attachment and for coupling delay lines Won’t dry, run, leach or dissolve with water or couplants Eliminates the need to replace wedge couplant during inspections	Fluid	-50 to 700°F -45° to 371°C	N/A
	Echo Shear Wave Couplant™	Transmit normal incidence shear wave Water soluble, easily removed with water Low toxicity, non-irritating	Paste	40 to 90°F 4° to 32°C	N/A
	Echo Z+™	High acoustic impedance Decreases surface noise Ideal for rough surfaces and concrete Strong ferrous corrosion inhibition	Fluid, Low, Medium, High, Very High	0 to 200°F -18° to 93°C	Strong ferrous corrosion inhibition
	Echo 8ZH™	For flow metering and long term monitoring at elevated temperatures Enhanced acoustic impedance Reduces acoustic noise from rough surface	Paste	Short term: -45 to 750°F Long term: -45 to 400°F	Strong ferrous corrosion inhibition

High Temperature Couplant Comparison

	Couplant	Key Benefits	Viscosity	Temperature Range	Corrosion Characteristic
	VersaSonic^®	Broad operating range – subzero to 700°F Best performing UT couplant between 300 and 700°F Fast Response, no wait time Low smoke / Low toxicity / No char residue Does not contain peanut oil	Medium and High Viscosity Gel	-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 850°F -45° to 455°C	Excellent corrosion inhibition
	AeroSoniX™	High Temperature Couplant for Drones Pumps like a fluid, stays in place like a gel Optimal viscosity for drone inspections	Low Viscosity Gel	-50° to 775°F -45° to 412°C	Excellent corrosion inhibition
	EchoTherm™	Ultra-high temperature couplant Stable reading once polymer melts (a few seconds). Best on difficult measurements such as heavy corrosion, curved surface and small pipe Will smoke at 750°F Leaves plastic residue and should be wiped off transducer after use	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 / char residue Broadest operating range Low smoke	Paste	-40° to 1250°F -40 to 675°C	Meets ASTM F519

Fluid Couplant Comparison

	Couplant	Key Benefits	Viscosity	Temperature Range	Corrosion Characteristic
	EchoFLOW™	Easily pumped in extreme cold environment Environmentally safe, approved for use on the Alaskan Tundra Water-soluble.	Fluid	-40° to 150°F -40 to 65°C	N/A
	Echo 3HT™	Water-soluble. No need to remove Least expensive intermediate temperature fluid	Fluid	-30° to 350°F -34 to 177°C	Similar to water
	Echo 6 HT™	Low-cost silicone-based fluid Replacement for peanut, canola and mineral oils Low in viscosity, which is maintained over a broad operating range. No sticky film, varnish or smoke	Fluid	-40° to 675°F -40° to 357°C	Excellent
	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

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