ADHESIVE

Loctite

Loctite is the global leader in anaerobic adhesives, specifically known for Threadlockers, Thread Sealants, and Retaining Compounds. In industrial piping and pneumatic systems, Loctite is essential for preventing fastener loosening due to vibration and ensuring leak-proof connections.

1. Loctite Threadlockers (The "Big Three")

Threadlockers are categorized by their strength and the size of the fastener they are designed for. They cure in the absence of air between metal surfaces.

Type	Color	Strength	Technical Specifications	Best Use
Loctite 222	Purple	Low	Torque: 6 Nm; Temp: -54°C to 150°C	Small screws (< M6), adjustment screws.
Loctite 243	Blue	Medium	Torque: 26 Nm; Temp: -54°C to 180°C	General Purpose. Removable with hand tools.
Loctite 271	Red	High	Torque: 33 Nm; Temp: -54°C to 180°C	Permanent assembly. Requires heat (250°C) to remove.

2. Loctite Thread Sealants (For Pipes)

Unlike standard Teflon tape, these liquid sealants provide 100% sealing and won't shred or clog pneumatic valves.

Loctite 567: High-temperature sealant for coarse threads (up to 250°C). Excellent for stainless steel.
Loctite 577: Medium-strength, general-purpose sealant for all metal threads.
- Max Pressure: Up to 10,000 PSI when fully cured.
- Viscosity: High (Thixotropic), meaning it won't run or drip during application.

3. Key Technical Performance Metrics

Fixture Time: The time it takes to hold the parts in place (typically 5–20 minutes depending on the metal type).
Full Cure Time: Usually 24 hours to reach maximum pressure and vibration resistance.
Breakaway Torque: The force required to start the movement of a nut or bolt.
Prevailing Torque: The force required to continue turning the fastener after the initial "break."
Oil Tolerance: Modern formulas (like 243 and 263) are designed to work effectively even on surfaces that haven't been perfectly degreased.

4. Application Guide for Industrial Use

Clean: For best results, clean threads with a primer (like Loctite SF 7471) or a degreaser.
Apply: Apply the liquid to the leading threads of the male fitting.
Assemble: Tighten the assembly to the required torque.
Wait: Allow sufficient fixture time before subjecting the system to pressure.