Henkel LOCTITE 3623 UV Wire Protection Adhesive for Headphone Assembly

LOCTITE 3623 UV Wire Protection Adhesive Performance

Henkel identifies LOCTITE 3623 as a translucent liquid based on acrylate technology. The ready-to-use single-component format helps eliminate weighing, mixing, and ratio variation. After dispensing, the coating remains available for positioning until it receives the required ultraviolet exposure. This on-demand curing behavior supports short production cycles and controlled processing in headphone, headset, and compact electronic assembly operations.

The official technical data sheet lists viscosity of approximately 18,680 mPa·s at 25°C when tested at a shear rate of 20 s^-1. This relatively high viscosity supports localized deposition and helps the material remain around wires or designated coating areas instead of flowing excessively across nearby parts. Dispensing performance depends on material temperature, nozzle diameter, pressure, shot time, equipment design, and target geometry.

LOCTITE 3623 UV Wire Protection Adhesive for Headphone Assembly

The manufacturer-stated application is wire protection coating in headphone assembly manufacturing. The adhesive may be applied around selected cable sections, wire exits, reinforced junctions, or other exposed areas requiring a cured protective layer. It may also be evaluated for related small electronic devices that use similar wire-protection processes, provided material compatibility, UV access, coating thickness, and finished-product requirements are validated.

Because the product cures with light, the required coating area must receive adequate UV energy. Shadowed regions, opaque obstructions, deep recesses, and excessive material thickness can reduce cure completeness. Production engineers should position lamps and fixtures for uniform exposure and verify light intensity, spectral output, exposure time, distance, and cleanliness of optical components.

7 Benefits of LOCTITE 3623 UV Wire Protection Adhesive

• One-component processing: Requires no weighing, mixing, or separate hardener.
• Fast UV curing: Supports rapid handling and short electronics assembly cycles.
• Controlled viscosity: Helps maintain localized coating around wires and selected device areas.
• Translucent appearance: Supports visual inspection of the coated area and underlying assembly.
• Rapid fixture response: Reference fixture time is approximately 10 seconds at 6 mW/cm².
• Short tack-free time: Reference tack-free time is approximately 15 seconds at 100 mW/cm².
• Useful cure depth: Henkel reports approximately 3.1 mm after 30 seconds at 100 mW/cm².

Applying LOCTITE 3623 UV Wire Protection Adhesive

Ensure wires, insulation surfaces, housings, and adjacent components are clean, dry, and free from dust, oil, moisture, release agents, and contamination. Use dispensing equipment compatible with UV-curable acrylates and select a nozzle that produces the required bead or coating profile. Apply only the quantity needed to cover the specified area, avoiding connectors, contacts, acoustic openings, switches, and surfaces that must remain uncoated.

Expose the deposited material to a validated UV source. Henkel’s published cure results are reference values rather than universal production settings. The technical data sheet states that cure speed and final cure depth depend on light intensity, spectral distribution, exposure time, and substrate light transmission. Each production line should establish its own process window and confirm complete curing through visual inspection, hardness checks, adhesion testing, and finished-device reliability evaluation.

LOCTITE 3623 UV Wire Protection Adhesive Quality Control

Henkel reports cured hardness of approximately 72.5 Shore D, indicating a comparatively hard protective material after adequate UV exposure. Production qualification should evaluate coating dimensions, surface tack, cure depth, adhesion to actual wire insulation and component materials, flexing, temperature cycling, humidity, vibration, and relevant assembly chemicals.

UV lamps lose output with age and contamination. Regular radiometer checks and preventive maintenance help maintain repeatable results. Record lamp type, intensity at the work surface, exposure time, distance, part orientation, dispensing volume, and material batch for consistent production control.

Storage, Safety, and Official Product Resources

Protect unused material from unintended light exposure and contamination, keep the original container closed when not dispensing, and follow the storage conditions printed on the current label. Review the safety data sheet before use and provide suitable ventilation, protective gloves, eye protection, and UV shielding.

Review the official LOCTITE 3623 technical data sheet and visit the official Henkel Adhesive Technologies website for current technical support, safety documents, and regional availability.

Explore our UV curing adhesives for additional rapid-curing electronic assembly materials. Browse our electronic assembly adhesives for wire protection, component fixing, reinforcement, coating, and precision device production. Contact our sales team for quotations, package availability, technical documents, bulk quantities, and export support.