loctite eccobond bf 4

Loctite ECCOBOND BF 4

Applications：Die attach
Color:Black
Cure schedule, @ 100.0 °C:30.0 min.
Glass transition temperature (Tg):94.0 °C
Number of components:1 part
Shear strength:24.0 kg-f
Storage temperature:-40.0 °C
Viscosity, Brookfield CP51, @ 25.0 °C Speed 5 rpm:23500.0 mPa·s (cP)

Overview

Loctite ECCOBOND BF 4 is an electronic-grade adhesive from Henkel’s ECCOBOND family, designed for bonding and securing electronic components in assemblies such as PCBs, modules and sensors.

It is formulated to provide reliable adhesion, controlled flow and long-term stability, supporting robust electrical and mechanical performance in demanding environments.

Use Loctite ECCOBOND BF 4 when you need consistent, production-friendly bonding for sensitive electronic parts instead of purely mechanical retention.

Key Features & Benefits

  • Electronic-grade formulation
    Designed for use in electronics manufacturing, with properties tailored for component and board-level applications.

  • Consistent, reliable bonds
    Provides strong, stable adhesion to typical electronic substrates when surfaces are properly prepared.

  • Good processability
    Engineered for repeatable dispensing and assembly, helping support automated or semi-automated production lines.

  • Gap-filling capability
    Suitable for bonding components, housings or small gaps where rigid fixtures are not practical.

  • Supports long-term performance
    Helps maintain mechanical support and positional stability for components exposed to vibration, handling and thermal changes.

Always verify exact thermal, mechanical and electrical properties using the current Technical Data Sheet.

Typical Applications

Loctite ECCOBOND BF 4 is typically used in electronic and electrical assemblies, for example:

  • Bonding components to PCB surfaces (supporting tall or vibration-sensitive parts)

  • Securing connectors, coils, sensors or small housings on boards and modules

  • Reinforcing soldered joints where additional mechanical support is desired

  • Assembly of small electronic modules used in automotive, industrial, consumer or communication devices

Suitability for specific substrates and processes (reflow, cleaning, etc.) should always be confirmed by testing.

How Loctite ECCOBOND BF 4 Works

Loctite ECCOBOND BF 4 is supplied as a specialty adhesive for electronics:

  1. Application

    • The product is dispensed onto the target area (e.g., PCB land, component body or housing surface) using a syringe, jetting system or other dosing equipment.

  2. Assembly

    • Components are placed into the adhesive and aligned. The material wets and contacts both surfaces, filling small gaps and providing mechanical support.

  3. Curing

    • The adhesive is allowed to cure according to the recommended schedule (room-temperature and/or heat-cure, depending on the formulation), developing final strength and stability.

  4. In service

    • Once fully cured, the adhesive helps lock components in place, improving mechanical robustness and long-term reliability.

Typical Property Snapshot*

Descriptive only – for design work, use the official Henkel TDS and run in-house validation.

  • Type: Electronic-grade adhesive from the ECCOBOND series

  • Form: Ready-to-use material suitable for controlled dispensing

  • Substrates: Common electronic materials (e.g., PCB laminates, metals, plastics – confirm with TDS)

  • Cure: Application-specific schedule (room temperature and/or thermal cure)

  • Performance: Provides stable adhesion and mechanical support under typical device operating conditions

Directions for Use

  1. Surface preparation

    • Ensure bonding surfaces are clean, dry and free from oil, flux residues and dust.

    • If needed, use an approved solvent or cleaning process to prepare PCBs and components.

  2. Dispensing

    • Condition the material as recommended and dispense a controlled amount to the target area using suitable equipment.

    • Adjust dot size / bead length to achieve adequate coverage without excess squeeze-out.

  3. Component placement

    • Place components into the wet adhesive and align within the open time.

    • Apply light pressure if necessary to ensure full contact.

  4. Curing

    • Follow the specified cure schedule (time and temperature) from the TDS to achieve full properties.

    • Avoid disturbing the assembly until sufficient handling strength is reached.

  5. Inspection

    • Visually check for correct coverage and no unwanted bridging.

    • Perform functional and reliability testing as required for your quality standards.

Storage & Handling

  • Store in original, tightly closed containers under the temperature conditions recommended by Henkel.

  • Protect from moisture, contamination and extreme temperatures.

  • Follow the Safety Data Sheet (SDS) for PPE, ventilation and safe handling practices.

  • Observe recommended shelf-life and bring material to processing temperature before use.

FAQs

Q1: What is Loctite ECCOBOND BF 4 primarily used for?
A: It is used for bonding and securing electronic components in assemblies such as PCBs and modules, where stable, electronic-grade adhesion is required.

Q2: Can it be used with automated dispensing equipment?
A: Yes. ECCOBOND materials are typically formulated for controlled, repeatable dispensing, but the exact viscosity and setup should be verified for your process.

Q3: Does Loctite ECCOBOND BF 4 cure at room temperature or with heat?
A: The specific cure profile must be taken from the official TDS; many electronics adhesives support room-temperature cure, heat cure, or a combination.

Q4: Is it suitable for all plastics and substrates?
A: Not necessarily. Always confirm adhesion and compatibility with your exact materials and conditions through testing before full-scale production.

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