LOCTITE® 380E is a black, medium viscosity instant adhesive that offers enhanced flexibility, peel strength and shock resistance. Designed for use on metals, plastics and rubber substrates, it cures rapidly via moisture and exhibits strong adhesion even in tolerable environments.
LOCTITE® 380E (also known as Black Max 380) is a single-component, room-temperature cure adhesive based on rubber toughened ethyl cyanoacrylate. Its formulation delivers superior performance where assemblies face shock, vibration or thermal stress. With a medium viscosity of approximately 300–800 mPa·s, it balances fast penetration into close fitting parts while maintaining precise control during application. Fixture is typically achieved in under 120 seconds depending on substrate and bondline gap, with final strength developing over 24 hours. The product provides excellent peel strength (>14 pli), high dielectric breakdown (~25 kV/mm), and a tensile strength of around 2 700 psi. It bonds reliably to metal, plastic and rubber substrates and remains functional in service temperatures from –65 °C to +107 °C.
Colour: Black liquid
Viscosity: 300–800 mPa·s at 25 °C
Specific gravity: ~1.05 at 25 °C
Fixture time: Up to 120 seconds depending on substrate and gap
Full cure: ~24 hours
Shear strength (steel): ~3 800 psi (~26 N/mm²)
Tensile strength: ~2 700 psi (18.6 N/mm²)
Peel strength: ≥14.8 lb/in (≥2.6 N/mm)
Dielectric strength: ~25 kV/mm
Service temperature range: –65 °C to +107 °C (~–85 °F to +225 °F)
Primary Chemistry: Ethyl cyanoacrylate
Prevents bond failure in assemblies subjected to shock or vibration Supports flexible and durable connections in dissimilar materials Reduces application defects caused by overrun products Improves consistency in production by delivering repeatable curing and adhesion properties
LOCTITE® 380E is ideal for bonding close-fitting parts in assemblies with metals, plastics or rubber. Use in applications where flexibility and shock resistance are needed in high stress environments. Apply a small drop to male or female part, assemble promptly, and allow humidity cure to develop fixture strength. Full cure occurs within 24 hours at ambient conditions. This adhesive is widely used in consumer electronics, rubber bonding, small mechanical assemblies, and industrial fittings.
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