Fasto A754 - Thread Sealants

Fasto A754 – Flexible, High Chemical Resistant Pipe Thread Sealant

Fasto A754 is a single-component, high-strength, refrigerant-grade anaerobic pipe sealant designed for locking and sealing fine to medium pitch 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.

Engineered for highest chemical resistance, Fasto A754 provides an almost instant low-pressure seal and, once fully cured, seals up to the bursting pressure of the pipe, making it ideal for hydraulic, pneumatic, and refrigerant systems.

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Application Pointers:

  • Sealing and locking of metal pipe threads
  • Fine to medium pitch pipe threads up to 3″ diameter
  • Hydraulic and pneumatic pipe systems
  • Refrigerant and fluid handling systems requiring leak-proof joints
  • Pipe joints exposed to vibration, pressure, oils, and solvents
  • Assemblies requiring rapid low-pressure sealing

Typical Application Areas:

  • Hydraulic pipelines
  • Pneumatic circuits
  • Refrigeration and HVAC systems
  • Industrial fluid transfer lines
  • Maintenance and repair of threaded pipe joints

Key Features

  • High Strength Pipe Thread Sealing
    Breakaway torque 18–22 Nm (M10 steel fasteners).
  • Refrigerant-Grade Formulation
    Suitable for demanding fluid and gas systems.
  • Fast Initial Sealing
    Low-pressure seal up to 2 bar within 15 minutes.
  • High Final Pressure Resistance
    Seals up to bursting pressure (≈10,000 psi) when fully cured.
  • Medium Viscosity (~2100 cPs)
    Controlled application without run-off.
  • Wide Operating Temperature Range
    -60°C to +150°C (continuous).
  • Excellent Chemical & Solvent Resistance
    Resistant to motor oil, petrol, brake fluid, acetone, alcohols, and water.
  • Green Colour
    Easy visual identification during application.

Benefits

  • Prevents leakage and vibration loosening in pipe joints
  • Ideal for hydraulic, pneumatic, and refrigerant pipe systems
  • Provides flexible sealing under thermal cycling
  • Ensures long-term reliability in chemically aggressive environments
  • Suitable for pipes up to Ø 3 inches
Primary Application Sub-Applications Functional Purpose Key Performance Advantage
Hydraulic Pipe Thread Sealing Hydraulic pipe fittings, pressure lines Seal and lock threaded joints under pressure Instant low-pressure seal, high final pressure resistance
Pneumatic System Pipe Sealing Pneumatic lines, air fittings Prevent air leakage and vibration loosening Flexible anaerobic seal with vibration resistance
Refrigerant Line Thread Sealing Refrigeration & HVAC pipe joints Leak-proof sealing in refrigerant systems Refrigerant-grade chemical resistance
Fine to Medium Pitch Pipe Threads Pipe threads up to Ø 3” Reliable sealing of close-fitting threads Optimized viscosity for fine & medium threads
High-Pressure Pipe Assemblies Industrial fluid transfer systems Maintain seal integrity under extreme pressure Seals up to bursting pressure after full cure
Vibration-Exposed Pipe Joints Compressors, pumps, machinery piping Prevent loosening due to vibration Anaerobic locking & sealing combined
Chemical-Resistant Pipe Sealing Oil, fuel, solvent-exposed joints Long-term chemical resistance Excellent resistance to oils & solvents

Surface Preparation

  • Ensure threads are clean, dry, and free from dirt, oil, grease, and contaminants.
  • Proper cleaning ensures maximum sealing performance and cure speed.

Application Method

  1. Apply Fasto A754 to all engaged pipe threads.
  2. Assemble the joint and tighten to the specified torque within 4–5 minutes.
  3. Allow the joint to cure under anaerobic (air-excluded) conditions.
  4. Wipe off excess sealant from the outside of the joint.

Curing Guidelines

  • Fixture time: 6–8 minutes
  • Functional cure: 4–6 hours
  • Full cure: 12 hours
  • Low-pressure seal: Up to 2 bar in ~15 minutes
  • Maximum recommended gap: 0.25 mm
  • Pipe size: Up to Ø 3 inches

Additional Notes

  • Cure speed depends on temperature, bond gap, and substrate.
  • At temperatures below 5°C, use Fasto AP49 Activator to accelerate cure (activator may reduce final strength by up to 30%).
  • On plastic-to-plastic joints, Fasto AP4 is recommended.
  • Not recommended for pure oxygen or chlorine systems.

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