Loctite 638: High-Temperature Resistance and Rapid Curing for Optimized Mechanical Connections

Loctite 638: High-Strength Retaining Compound for Tight Fits and Extreme Conditions

1. Product Overview

Loctite 638 is a high-strength anaerobic retaining compound designed to securely bond and seal cylindrical assemblies. Ideal for applications requiring a tight fit, Loctite 638 provides excellent performance under extreme conditions, including high temperatures and heavy loads. This product is particularly suited for use in industrial maintenance and repair, as well as enhancing the strength and reliability of mechanical assemblies.

2. Key Features

• High Strength Bonding
  • Provides strong retention and sealing of cylindrical components, ensuring a durable and reliable fit.
• High-Temperature Resistance
  • Maintains performance in temperatures up to 180°C (356°F), making it suitable for high-temperature environments.
• Rapid Curing
  • Quick curing time minimizes downtime, allowing for faster assembly and repair processes.
• Chemical Resistance
  • Excellent resistance to oils, lubricants, and other chemicals, ensuring long-term durability in challenging conditions.
• Gap Filling
  • Effectively fills gaps between components, enhancing structural strength and integrity.

3. Product Specifications

• Chemical Type: Methacrylate
• Color: Green
• Viscosity: 1,000 – 2,000 mPa·s (cP)
• Cure Time: Initial cure in 10-30 minutes; full cure in 24 hours at room temperature
• Maximum Gap Filling: Up to 0.25 mm (0.010 inches)
• Operating Temperature Range: -55°C to +180°C (-67°F to +356°F)
• Shear Strength: 20 N/mm²
• Breakaway Torque: 24-34 Nm (M10 bolts)
• Prevail Torque: 10-22 Nm
• Chemical Resistance: Excellent resistance to oils, lubricants, and various chemicals

4. Applications

• Industrial Maintenance
  • Ideal for securing and sealing mechanical components in machinery and equipment, particularly in high-load and high-temperature environments.
• Repair and Enhancement
  • Used for repairing and reinforcing fits between cylindrical parts, improving the strength and longevity of the assembly.
• Heavy-Duty Equipment
  • Suitable for applications involving heavy-duty equipment where robust and reliable bonding is required.
• Automotive Industry
  • Provides reliable bonding and sealing in automotive assemblies, ensuring performance under demanding conditions.

5. How to Use

1. Clean the Surfaces: Ensure surfaces are clean and free from oil, dirt, and debris to achieve optimal adhesion.
2. Apply the Compound: Evenly apply Loctite 638 to the surface of one of the parts.
3. Assemble the Parts: Join the parts and tighten to ensure the compound fills the gaps.
4. Curing: Allow to cure for 10-30 minutes for initial set and up to 24 hours for full cure at room temperature.