Name: LOCTITE EA 9394S
Brand: Henkel Corporation
SKU: LOCTITE EA 9394S

Main features

28.9 MPa Aluminum Lap Shear
Controlled Two-Part Processing
Paste-Form Adhesive Application

Product Description

LOCTITE EA 9394S is a two-part, room-temperature-curing epoxy paste adhesive for structural bonding and for potting, filling, and liquid-shim applications. The thixotropic, gap-filling system uses a 100:17 Part A-to-Part B mix ratio by weight and provides a 90-minute pot life for a 450 g mass at 25 degrees C. After cure, documented mechanical data include typical lap shear strength of 28.9 MPa at 25 degrees C and 8.3 MPa at 177 degrees C on phosphoric-acid-anodized 2024-T3 aluminum. Normal cure is 3 to 5 days at 25 degrees C, while small masses may be accelerated, including 1 hour at 66 degrees C.

Key features

Product form: Two-part structural epoxy paste adhesive with thixotropic, gap-filling behavior.
Mix ratio: 100 parts Part A to 17 parts Part B by weight.
Pot life: 90 minutes for a 450 g mass at 25 degrees C, tested by ASTM D2471.
Ambient cure: 3 to 5 days at 25 degrees C for normal performance.
Accelerated cure: 1 hour at 66 degrees C for small masses.
High-temperature strength: Typical lap shear strength of 8.3 MPa at 177 degrees C under the documented ASTM D1002 test configuration.

Applications / Suitable for

Structural bonding in aerospace assembly contexts.
Potting and localized filling where a thixotropic paste is appropriate.
Liquid-shim applications requiring a cured gap-filling material.

TDS, SDS & Technical Documents

Technical Specifications

No specifications available.

Additional Information

Aerospace structural adhesive

LOCTITE EA 9394S

LOCTITE EA 9394S is a two-part structural epoxy paste adhesive for room-temperature cure and demanding bonded assemblies. Its thixotropic, gap-filling form supports structural bonding, potting, filling, and liquid-shim applications, while documented mechanical data show useful strength retention from subzero testing through 177 degrees C on prepared 2024-T3 aluminum.

Two-part epoxy paste Room-temperature cure 100:17 mix ratio by weight 90-minute pot life at 25 degrees C Gap-filling and liquid-shim use

LOCTITE EA 9394S two-part epoxy paste adhesive.

As-supplied properties

Mix ratio

100:17 by weight

Part A to Part B. The weight basis should be preserved for ratio control.

Pot life

90 minutes

For a 450 g mixed mass at 25 degrees C, tested by ASTM D2471.

Values are source-reported and typical where indicated. Preserve component identity, ratio basis, temperature, mass, and test context during evaluation.

Property	Value	Unit	Method / condition
Product form	Two-part epoxy paste adhesive	N/A	Part A and Part B are mixed immediately before application.
Part A appearance	Gray paste	N/A	As supplied.
Part B appearance	Black gel	N/A	As supplied.
Mixed color	Gray	N/A	After complete mixing.
Mix ratio	100:17	By weight	Part A to Part B. Volume measurement is not recommended for structural applications unless ratio control is assured.
Pot life	90	Minutes	450 g mass at 25 degrees C; ASTM D2471 in a water bath.
Part A density	1.49	g/mL	As-supplied component density.
Part B density	1.0	g/mL	As-supplied component density.
Mixed density	1.36	g/mL	Mixed adhesive.
Shelf life	1	Year	Part A and Part B stored below 25 degrees C.

Processing

Mixing, application, and cure

Control the mix ratio, mixed mass, surface preparation, assembly support, and cure schedule. Pot life and exotherm are mass- and temperature-dependent, and handling strength is not equivalent to full cure.

Mixing: Bring the separate components close to room temperature, combine Part A and Part B at 100:17 by weight, and mix completely.

Mixed mass: Do not mix quantities greater than 450 g. Heat buildup is normal, but larger masses can produce dangerous exotherm and uncontrolled decomposition.

Application: Use clean, dry, properly prepared bonding surfaces and hold the parts in contact until the adhesive has set.

Cure: Handling strength is reached after 24 hours at 25 degrees C. Normal performance develops after 3 to 5 days at 25 degrees C. For small masses, 1 hour at 66 degrees C is an example complete accelerated cure.

Storage and handling

Store components below 25 degrees C to support the stated one-year shelf life. Keep containers tightly closed in cool, well-ventilated storage and away from heat or incompatible materials. For industrial use only; use adequate ventilation and appropriate personal protective equipment based on the workplace assessment. Review the current safety data sheets before use.

Dual-cartridge dispensing guidance

Conditioning and setup

Dispense dual-cartridge kits at ambient temperature. When preheating is required, do not exceed 32 degrees C for more than four hours. Do not attach the static mixer during conditioning or place assembled cartridges upright in the oven.

Start-up pressure and pauses

Seat the kit correctly against the plungers, burp the adhesive at low pressure, and start the plungers at 20 psi before increasing pressure. Do not leave adhesive unattended in the static mixer for more than 90 minutes because cure can generate back pressure.

Cured material properties

Service temperature

177 degrees C

Defined as the temperature at which ASTM D1002 lap shear remains at least 6.9 MPa under the documented test configuration.

Compressive strength

68.9 MPa

Typical value at 25 degrees C using ASTM D695 and the specified specimen geometry.

The values below are typical bulk-resin data and should not be treated as guaranteed design allowables or complete bonded-assembly performance.

Property	Value	Unit	Method / condition
Tensile strength	46.0	MPa	Typical bulk-resin result at 25 degrees C; ASTM D638; 3.18 mm casting.
Tensile modulus	4,237	MPa	Typical bulk-resin result at 25 degrees C; ASTM D638.
Shear modulus, dry	1,461	MPa	Typical bulk-resin result at 25 degrees C.
Shear modulus, wet	1,027	MPa	Typical bulk-resin result at 25 degrees C.
Elongation at break	1.66	%	Typical bulk-resin result at 25 degrees C; ASTM D638.
Shore D hardness	88	Shore D	Typical value at 25 degrees C.
Glass transition temperature, dry	78	degrees C	Typical bulk-resin value.
Glass transition temperature, wet	68	degrees C	Typical bulk-resin value.
Compressive strength	68.9	MPa	Typical result at 25 degrees C; ASTM D695; specified rectangular specimen geometry.
Dielectric constant	7.72 / 7.51 / 7.20	N/A	At 0.1 / 1.0 / 10.0 kHz; ASTM D149 and D150.
Dissipation factor	0.017 / 0.022 / 0.033	N/A	At 0.1 / 1.0 / 10.0 kHz; ASTM D149 and D150.
Thermal conductivity	0.331	W/(m K)	Typical bulk-resin value.
Volume resistivity	4.05 x 1013	ohm-cm	Typical bulk-resin value.
Surface resistivity	4.60 x 1013	ohm	Typical bulk-resin value.
Coefficient of thermal expansion	55.6 at 40 degrees C; 80.6 at 100 degrees C	um/m degrees C	Typical bulk-resin values at the stated temperatures.

Bond strength and exposure evidence

These typical results are specific to the stated substrates, surface preparation, cure, exposure, and test methods. They support product evaluation but are not universal joint-strength guarantees.

Lap shear across test temperature

Typical tensile lap shear results were 22.7 MPa at -55 degrees C, 28.9 MPa at 25 degrees C, 20.7 MPa at 82 degrees C, 20.0 MPa at 93 degrees C, 15.8 MPa at 121 degrees C, 11.0 MPa at 149 degrees C, 8.3 MPa at 177 degrees C, and 4.1 MPa at 204 degrees C.

ASTM D1002 after 5 days of cure at 25 degrees C; 2024-T3 bare aluminum with phosphoric-acid anodization per ASTM D3933.

Seven-day fluid exposure

At 25 degrees C, typical lap shear was 29.6 MPa for the unexposed control, 28.2 MPa after water exposure, 27.6 MPa after isopropyl alcohol exposure, 28.2 MPa after hydraulic-oil exposure, and 28.9 MPa after JP-4 fuel exposure.

Seven-day exposures at 25 degrees C; interpret only within the documented specimen and test configuration.

Peel strength on prepared aluminum

Typical T-peel strength was 22 N/2 mm at 25 degrees C after a 5-day cure, and typical Bell peel strength was 89 N/25 mm at 25 degrees C after a 7-day cure.

ASTM D1876 and ASTM D3167; 2024-T3 AlClad aluminum with phosphoric-acid anodization per ASTM D3933.

Applications

Applications and use contexts

Documented uses include structural bonding, potting, filling, and liquid-shim applications. Final suitability depends on the actual substrates, joint or cavity geometry, surface preparation, mixed mass, cure, loading, and service environment.

Prepared aerospace metal components positioned for structural adhesive bonding

Structural bonding

The two-part paste is positioned for structural bonded joints, with lap-shear and peel data reported on phosphoric-acid-anodized 2024-T3 aluminum. Substrate, preparation, bondline, cure, and load direction must be evaluated for the actual assembly.

Thixotropic epoxy paste being dispensed into a localized cavity for potting or filling

Potting and filling

The thixotropic, gap-filling paste can be evaluated for localized potting and filling. Cavity volume and mixed mass are important because the bulletin limits mixed quantities to 450 g to control exotherm.

Assembly gap being filled with epoxy paste for a liquid-shim application

Liquid-shim applications

The paste is identified for liquid-shim use where an assembly gap is filled and cured. Confirm the gap geometry, support conditions, load path, cure, and final dimensional requirements for the specific assembly.

Next steps

Evaluate LOCTITE EA 9394S with Krayden

Krayden can help review substrate preparation, mix and dispense requirements, cure schedules, bondline or gap geometry, and the relevance of the published mechanical data to your application. Contact the team to discuss product selection, samples, or a technical evaluation plan.

Discuss Your Application