Permabond HL138 Retaining Compound

Description

Permabond® HL138 is a high-strength anaerobic retaining compound designed for locking cylindrical assemblies such as shafts, hubs, bearings, and bushings. It cures when confined between metal parts in the absence of oxygen, forming a tough, cross-linked plastic that eliminates wear, pitting, and erosion in assembled components.

This military-grade adhesive meets MIL-SPEC MIL-R-46082B Type I and ASTM D5363 (Group 04, Class 1, Grade 1), ensuring compliance for military, aerospace, and industrial applications.

For customers seeking alternatives to Loctite® 638, 3M™ Scotch-Weld™ RT38, or Permatex® Green Retaining Compound, Permabond HL138 provides a superior, high-performance solution.

Key Features & Benefits

✅ High-Strength, Permanent Retention – Prevents movement, fretting, and loosening in cylindrical assemblies
✅ MIL-SPEC Compliant – Meets MIL-R-46082B Type I and ASTM D5363 (Group 04, Class 1, Grade 1)
✅ Fills Small Gaps & Increases Push-Out Force – Allows clearance fits while increasing joint strength
✅ Fast Curing at Room Temperature – Handling strength in 10 minutes, full cure in 24 hours
✅ Excellent Shear Strength – Withstands high loads and extreme environmental conditions
✅ Resists Wear, Erosion & Corrosion – Protects components from damage over time
✅ 100% Solids, Solvent-Free – Environmentally friendly and safe for industrial use

Technical Specifications

• Viscosity: 150-300 mPa.s (low viscosity)
• Gap Fill: 0.127 mm (0.005 in)
• Maximum Thread Size: M20 (¾”)
• Handling Strength: ~10 minutes at 23°C (73°F)
• Full Cure Time: 24 hours
• Torque Strength (M10 Steel, ISO 10964):
  • Break: 20 N·m (180 in.lb)
  • Prevail: 36 N·m (315 in.lb)
• Shear Strength (Steel Collar & Pin, ISO 10123): 16 MPa (2300 psi)
• Temperature Range: -55°C to 150°C (-65°F to 300°F)
• Color: Green

Applications

• Retaining cylindrical components in slip, press, or shrink fit assemblies
• Securing shafts, hubs, and gears in rotating machinery
• Preventing wear and fretting in high-load mechanical systems
• Enhancing clearance fit assemblies by increasing push-out force
• Oil & gas, mining, and military-grade applications

Directions for Use

1. Ensure surfaces are clean, dry, and grease-free. Use acetone or isopropanol for best results.
2. For slip fit assemblies, apply HL138 to the leading edge of the pin and inside the collar.
3. For press fit assemblies, apply HL138 to both components before pressing them together.
4. For shrink fit assemblies, heat the collar, apply HL138 to the pin, and assemble while components are expanded.
5. Allow 10 minutes for handling strength and 24 hours for full cure.
6. For faster curing, use Permabond A905 or ASC10 Activator.

🔹 Note: HL138 is a high-strength retaining compound—removal may require localized heating and mechanical force. Not recommended for plastic components or oxygen-rich systems.