Fasto A767 – High Lubricity Pipe Thread Sealant for Large Diameter Pipes
Fasto A767 is a single-component, medium-to-low strength, PTFE-based anaerobic pipe sealant developed for locking and sealing straight and tapered metal pipe threads. It cures in the absence of air when confined between close-fitting metal surfaces, forming a flexible, vibration-resistant, and leak-proof seal.
Its extremely high viscosity white paste formulation provides excellent lubricity, allowing easy assembly and disassembly of large-diameter pipe joints while still preventing vibration loosening and leakage.
Fasto A767 delivers an almost instant low-pressure seal and, once fully cured, seals up to the bursting pressure of the pipe (≈10,000 psi).
PTFE-Based Anaerobic Technology Combines sealing performance with high lubricity.
Medium–Low Strength – Serviceable Joints
Breakaway torque: 3.0 Nm
Prevailing torque: 1.75 Nm (M10 steel fasteners).
Extremely High Viscosity (~560,000 cPs) Thixotropic paste prevents run-off and migration.
Instant Low-Pressure Sealing Seals up to 2 bar in ~20 minutes.
High Final Pressure Resistance Seals up to pipe bursting pressure (~10,000 psi).
Wide Operating Temperature Range -60°C to +150°C (continuous).
Excellent Chemical & Solvent Resistance Resistant to motor oil, petrol, brake fluid, acetone, ethanol, propanol, and water.
White Colour Easy visual identification during application.
Benefits
Prevents leakage and vibration loosening in pipe systems
Enables easy assembly and controlled disassembly
Ideal for large diameter pipe joints
Provides long-term sealing reliability
Suitable for medium to coarse pitch threads
Primary Application
Sub-Applications
Functional Purpose
Key Performance Advantage
Pipe Thread Sealing & Locking
Straight & tapered metal pipe threads
Seal and secure threaded pipe joints
PTFE-based, high lubricity with sealing
Large-Diameter Pipe Assemblies
Medium to coarse pitch threads, large pipe sizes
Easy assembly & disassembly of big threads
Very high viscosity, excellent gap filling
Hydraulic & Pneumatic Line Sealing
Hydraulic fittings, pneumatic connections
Prevent leakage under pressure
Rapid low-pressure seal, high-pressure capability after cure
Drain Plug & Serviceable Joint Sealing
Drain plugs, service ports
Leak prevention with serviceability
Medium–low strength for easier disassembly
Vibration-Exposed Pipe Systems
Pumps, compressors, machinery piping
Prevent loosening due to vibration
Maintains seal integrity over time
General Industrial Pipe Sealing
Process piping, utility lines
Long-term sealing & corrosion protection
Chemical & solvent resistance
High Gap & Rough Thread Sealing
Threads with larger clearances
Reliable sealing where gaps exist
High gap-fill capability with thixotropy
Surface Preparation
Ensure parts are clean, dry, and free from grease or oil.
Trials are recommended to confirm if additional cleaning is required.
Application Method
Apply Fasto A767 to all engaged threads. To minimise excess sealant inside the joint, apply mainly to the male threads, leaving the first two threads clear.
Assemble parts and tighten as required.
Allow curing under anaerobic (air-excluded) conditions.
Wipe off excess sealant from the outside of the joint.
Curing Guidelines
Fixture time: 20–25 minutes
Functional cure: 4–6 hours
Full cure: 12–14 hours
Maximum recommended gap: 0.50 mm
Maximum thread size: 36 mm
Additional Notes
Cure speed depends on temperature, bond gap, and substrate.
At temperatures below 5°C, use Fasto AP49 Activator to accelerate curing (may reduce final strength by up to 30%).
Not recommended for pure oxygen or chlorine systems.
Not suitable for certain plastics due to potential stress cracking.
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