Applications

LOCTITE® 641 – Retaining Compound – Bonding of Cylindrical Fitting Parts

Item Name: LOCTITE® 641
Manufacturer: Henkel
Technologies: Acrylic, Methacrylate Ester
Color: Yellow
Cure Type: Anaerobic, Secondary Cure with Activator
Package Size: Contact to Techniq VN for details.
Shelf Life: Contact to Techniq VN for details.

1. Product Overview

LOCTITE® 641 is a medium-strength, anaerobic acrylic adhesive designed for bonding cylindrical fitting parts, especially where disassembly is needed for servicing. It cures in the absence of air between close-fitting metal surfaces, preventing loosening and leakage due to shock and vibration.

2. Applications

  • Retention of bearings onto shafts and housings
  • Suitable for slip-fitted, press-fitted, and shrink-fitted assemblies
  • Works on steel, aluminum, and zinc dichromate substrates

3. Typical Properties

Uncured Material

Property Value
Appearance Yellow liquid
Specific Gravity @ 25°C 1.07
Viscosity @ 25°C (mPa·s) 1,215 – 2,750 (2.5 rpm) / 400 – 800 (20 rpm)
Fluorescence Negative

Cured Material

Property Value
Coefficient of Thermal Expansion 80×10⁻⁶ K⁻¹
Coefficient of Thermal Conductivity 0.1 W/(m·K)
Specific Heat 0.3 kJ/(kg·K)

Performance After 24 Hours @ 22°C

Property Value
Compressive Shear Strength (ISO 10123) ≥6.5 N/mm² (940 psi)

Environmental Resistance

Condition Strength Retention (%)
Motor oil @ 125°C (1000 h) 90
Unleaded Petrol @ 22°C (1000 h) 95
Brake fluid @ 22°C (1000 h) 100
Water/glycol (50/50) @ 87°C (1000 h) 90
Ethanol @ 22°C (1000 h) 100
Acetone @ 22°C (1000 h) 80

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