Henkel LOCTITE-AA-3951 (25ML-SYRINGE)

Additional Product Information

Overview

LOCTITE AA 3951 is a low-viscosity, UV/visible light-curing acrylic adhesive designed for fast, flexible bonding in aviation and MRO environments. It is widely used where rapid fixture times, strong adhesion to plastics and elastomers, and reliable environmental resistance are required. Maintenance teams rely on this adhesive for efficient repairs, component assembly, and time-critical AOG situations where speed and consistency are essential.

Key Technical Specs for LOCTITE AA 3951

• Type: Light-curing acrylated urethane adhesive
• Appearance/Color: Transparent, colorless to straw liquid
• Specific Gravity: ~1.05 uncured / ~1.15 cured
• Viscosity: 70–300 cP (mPa·s) @ 25°C (77°F)
• Cure Method: UV / Visible / LED light curing
• Fixture Time: ≤5 seconds @ 405 nm, 10 mW/cm²
• Elongation at Break: 251%
• Tensile Strength: 22.9 MPa (3,324 psi)
• Tensile Modulus: 490 MPa (71,000 psi)
• Shore Hardness: Shore D 62
• Linear Shrinkage: 3.2%
• Dielectric Strength: ~28.5 kV/mm
• Glass Transition Temperature (Tg): 20°C (68°F)
• Typical Uses: Flexible plastic bonding, rubber bonding, disposable medical assemblies

Approvals & Specifications

• Tested to Henkel protocols based on ISO 10993 biocompatibility standards
• Suitable for disposable medical device assembly
• Supports sterilization methods including Ethylene Oxide, Gamma, and Autoclave cycles

Typical Aircraft MRO / AOG Applications

• Bonding flexible PVC tubing and elastomeric components
• Repair and assembly of cabin interior plastic components
• Bonding sensors, housings, and lightweight assemblies
• Temporary or permanent bonding of transparent plastics
• Rapid repair tasks requiring quick fixture times

Compatibility & Safety Notes

• Compatible with PVC, TPE, thermoset rubbers, polycarbonate, ABS, acrylic, treated HDPE and PP
• Not recommended for pure oxygen or chlorine environments
• Use black feedlines and minimize light exposure during handling
• Ensure surfaces are clean and grease-free before bonding
• Use appropriate PPE and consult Safety Data Sheet before use

Packaging & Procurement

• Supplied in standard Henkel industrial packaging formats
• Store unopened containers in a dry environment
• Optimal storage temperature: 8–21°C (46–70°F)
• LED/UV curing enables easy integration into production or field repair kits

Why LOCTITE AA 3951 is Chosen for AOG / MRO

• Ultra-fast curing reduces aircraft downtime
• High flexibility prevents bond failure under vibration
• Reliable performance in humid and harsh environments
• Versatile bonding across plastics, elastomers, and metals
• Supports sterilization and demanding maintenance workflows

Practical Suggestions for Your Team (AOG Mindset)

• Stock LED curing lamps alongside adhesive for rapid field repairs
• Store adhesive in controlled temperature storage to maintain performance
• Train technicians on proper light exposure and bondline thickness
• Keep solvent wipes available for quick cleanup of uncured adhesive

Manufacture / Aviation Spec Codes

• Manufacturer: Henkel
• Product ID: LOCTITE AA 3951
• Technology: Acrylic Light Cure Adhesive

Alternative Names & Descriptions

• LOCTITE AA 3951 UV Adhesive
• LOCTITE 3951 Light Cure Adhesive
• Henkel LOCTITE 3951 Flexible UV Adhesive
• LOCTITE Medical Device Light Cure Adhesive