Loctite 380

Product Overview

LOCTITE 380 is a one-part, low-viscosity cyanoacrylate adhesive toughened with rubber to provide enhanced flexibility and durability. Designed for bonding close-fitting parts, it performs well on metals, rubbers and certain plastics. With excellent shear and peel strength and a quick fixture time of around 90 seconds, it’s ideal for applications requiring reliable and fast-setting bonds in assemblies.

Key Features & Benefits

• Rubber-toughened formulation — offers improved impact and peel resistance compared to standard CA adhesives.

• Low viscosity — flows easily into tight fits while maintaining controlled application.

• Strong adhesion to metals, rubbers and selected plastics — suited for mixed-material assemblies.

• Fast fixturing (~90 seconds on steel) — supports efficient assembly.

• Service temperature up to ~107 °C (225 °F) — suitable for many industrial applications.

Application

Surface Preparation:

• Clean both surfaces thoroughly — remove oil, grease, dust and old adhesive residues. A suitable degreaser is recommended (e.g., LOCTITE SF 7070).

• For challenging plastics, consider a primer (e.g., LOCTITE SF 770) to improve adhesion.

Application:

• Apply a small amount of LOCTITE 380 to one of the parts. Because of the rapid cure, accurate positioning is essential.

• Bring the mating part into position and hold/clamp until initial fixture (~90 seconds).

Curing / Handling:

• Initial bond strength reached quickly; full strength develops within 24 hours under ambient conditions.

• Avoid heavy loading until full cure is achieved.

Disassembly / Repair:

• For removal or repair, follow manufacturer’s instructions. Typically, heat or mechanical force may be required.

Tips:

• Use minimal adhesive to avoid bleed-out or blooming (white haze).

• Ensure tight fit parts and correct gap (<0.10 mm) for optimum performance.

• Because of toughened formulation, this product is better suited for assemblies subjected to shock or vibration.

FAQs

• Q: Can LOCTITE 380 bond rubber to metal effectively?
  A: Yes — its rubber-toughened formulation provides strong adhesion and impact resistance between rubber and metal.

• Q: What gap size is acceptable for LOCTITE 380?
  A: Approximate gap fill of ~0.10 mm for optimum strength.

• Q: Does this adhesive suit plastic substrates?
  A: It can, but performance depends on plastic type; for low-surface-energy plastics, use an appropriate primer.

• Q: What temperature range can it endure?
  A: Up to about 107 °C (225 °F) under typical conditions.

• Q: What’s the cure time before the part can be handled?
  A: Approximately 90 seconds to initial fixture on steel; full strength over 24 hours.