loctite ea 9340

Loctite EA 9340

Technology: Epoxy
Mix Ratio: 1:1 by weight or volume
Working Time: 90 minutes @ 25°C
Fixture Time: 6–8 hours @ room temperature
Full Cure: 24 hours @ room temperature
Shear Strength: 2,300 psi @ 25°C
Service Temperature: 0°F to 180°F (-18°C to 82°C)
Storage Temperature: 46°F to 69°F (8°C to 21°C)
Flash Point (Resin): >199.4°F (>93°C)
Flash Point (Hardener): >215.6°F (>102°C)
VOC Content: <0.05% (resin and hardener)

Overview

Loctite EA 9340 is a two-part structural epoxy adhesive designed for high-strength, durable bonding in industrial, transportation and equipment assemblies. Its paste-like, gap-filling consistency and balanced working time make it suitable for both manual and automated applications on a wide range of substrates.

Once cured, Loctite EA 9340:

  • Delivers high shear and peel strength on properly prepared substrates

  • Forms a tough, impact- and vibration-resistant bond line

  • Fills gaps and surface irregularities without running or sagging

  • Provides good resistance to many oils, fluids and industrial environments

It’s an excellent choice when you want to supplement or replace mechanical fasteners, improve stiffness and enhance long-term reliability in your design.

Key Features & Benefits

  • Two-component structural epoxy
    Resin and hardener react to form a rigid, high-strength adhesive suitable for structural and semi-structural joints.

  • Gap-filling, non-sag paste
    Thixotropic formulation stays where you apply it, even on vertical or overhead surfaces, and bridges gaps, machining marks and minor misalignment.

  • Toughened for dynamic loads
    Produces a tough, durable bond line that withstands impact, vibration and thermal cycling better than brittle epoxies.

  • Multi-substrate adhesion
    Bonds steel, aluminium, many coated metals, composites and selected engineering plastics (pre-test critical plastics and finishes).

  • Room-temperature cure (with heat acceleration option)
    Cures at ambient temperature; in many processes, moderate heat (if allowed by the design) can shorten cure time and increase throughput.

  • Improved stress distribution
    Adhesive bonding spreads loads across the entire bond area, helping reduce stress concentrations around welds, rivets and bolt holes.

Typical Applications

Loctite EA 9340 is commonly used for:

  • Metal & composite assemblies

    • Bonding brackets, ribs, stiffeners and inserts

    • Joining composite skins to metal or composite frames

  • Industrial equipment & enclosures

    • Bonded covers, panels and machine guards

    • Frames and housings exposed to vibration and handling

  • Transportation & general manufacturing

    • Structural bonding in vehicles, rail, off-road and industrial equipment

    • Replacing or backing up welds, screws and rivets in load-bearing assemblies

For safety-critical or certificated structures, always validate joint design, surface preparation and cure schedule with appropriate testing.

How to Use Loctite EA 9340

Step 1 – Surface preparation

  1. Ensure bonding surfaces are clean, dry and structurally sound.

  2. Remove loose paint, heavy rust, scale and weak coatings.

  3. Degrease to remove oil, grease, cutting fluids and release agents.

  4. For high-performance joints, light abrasion or grit blasting, followed by cleaning, is recommended on metals and composites.

Step 2 – Mixing

Bulk / kit packaging:

  1. Bring both components to the recommended working temperature.

  2. Mix resin and hardener at the specified mix ratio (by weight or volume).

  3. Stir thoroughly, scraping sides and bottom of the container until the mixture is uniform in colour and texture.

  4. Avoid entrapping excessive air and respect the pot life; only mix what you can apply in time.

Dual cartridge (if supplied):

  1. Load the cartridge into the applicator gun.

  2. Remove the cap, purge a small amount of each component, then attach a static mixing nozzle.

  3. Dispense and discard a short bead to ensure thorough mixing before applying to parts.

Step 3 – Application

  1. Apply a continuous, even bead or layer of mixed adhesive to one or both bonding surfaces.

  2. Ensure full coverage of the bond area and allow enough material to fill small gaps.

  3. Assemble the parts within the adhesive’s working time.

Step 4 – Assembly & cure

  1. Position components correctly and apply light clamping or fixturing to maintain alignment and bond line thickness.

  2. Do not over-clamp; maintain a thin but continuous bond line rather than squeezing out all adhesive.

  3. Allow the assembly to cure at room temperature until handling strength is reached.

  4. If permitted by the design, moderate heat can be used to accelerate cure and reduce time to full strength.

Step 5 – Finishing

  1. Remove excess uncured adhesive with a suitable solvent and a clean cloth.

  2. Once fully cured, adhesive can only be removed mechanically (scraping, sanding, machining).

  3. Cured joints can typically be drilled, machined and painted as required by the application.

Safety & Handling

  • Avoid skin and eye contact with uncured resin and hardener; epoxies and curing agents may cause irritation or sensitisation.

  • Use in a well-ventilated area and avoid breathing vapours or dust from machining cured material.

  • Wear appropriate PPE: chemical-resistant gloves, safety glasses and suitable protective clothing.

  • Do not discharge uncured product into drains or natural waterways; dispose of waste in line with local regulations.

  • Store components in their original, tightly closed containers in a cool, dry place away from heat and ignition sources.

Always follow the guidance in the current Safety Data Sheet (SDS) and technical data for Loctite EA 9340 before use.

FAQs

Q1: What is Loctite EA 9340 mainly used for?
Loctite EA 9340 is mainly used for structural bonding of metals, composites and selected plastics where high strength, gap filling and toughness are required.

Q2: Does Loctite EA 9340 cure at room temperature?
Yes. EA 9340 is designed to cure at ambient temperature after proper mixing. Where the design allows, moderate heat can be used to shorten cure time and increase early strength.

Q3: Can Loctite EA 9340 replace welding or mechanical fasteners?
In some designs it can reduce or replace welds, bolts and rivets, but this must be confirmed by engineering analysis and testing. Many users combine adhesive bonding with a reduced number of fasteners for redundancy.

Q4: Can it bond plastics as well as metals?
It can bond many engineering plastics, but performance depends on the specific polymer and surface preparation. Low-surface-energy or very flexible plastics may require special treatment or another adhesive. Always test your exact substrate.

Q5: How thick can the bond line be?
EA 9340 has good gap-filling capability, but very thick sections cure more slowly and can influence final properties. Design for a controlled bond line thickness according to your technical guidance.

Q6: Is the cured adhesive flexible?
Once cured, Loctite EA 9340 forms a rigid structural bond with enhanced toughness for impact and vibration, but it is not a soft, highly flexible sealant. If high flexibility is required, consider a different adhesive technology.

Q7: How can a bonded joint be disassembled or repaired?
Cured structural epoxies are difficult to remove. Typically you must cut, grind or machine the joint and, where allowed, apply controlled heat to help release it. Plan for future maintenance when designing bonded assemblies.

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