Fasto A750 - Thread Sealants
Features of A750
Fasto A750 - Thread Sealants
Features of A750

Fasto A750 – Very Fast-Curing, Primerless Pipe Sealant for Hydraulic & Pneumatic Systems

Fasto A750 is a single-component, medium-strength, very fast-curing, primerless anaerobic pipe thread sealant formulated to lock and seal fine to medium pitch metal pipe threads. It cures in the absence of air when confined between close-fitting metal surfaces, forming a vibration-resistant, leak-proof seal.

With its medium-to-high viscosity (thixotropic) formulation, Fasto A750 is suitable for stainless steel and coated threads, providing controlled application without run-off. Once fully cured, it can seal up to the bursting pressure of the pipe (e.g., ~10,000 psi) while still allowing serviceable disassembly.

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Key Features

  • Medium Strength – Serviceable Joints
    Breakaway & prevailing torque ~16 Nm (M10 steel fasteners).
  • Very Fast Curing
    Fixture time 2–8 minutes.
  • Primerless Anaerobic Technology
    No primer required on most metals.
  • Medium-High Viscosity (~5,000 cPs, thixotropic)
    Stays in place on vertical pipe threads.
  • Wide Temperature Resistance
    -50°C to +150°C (continuous).
  • Excellent Chemical & Solvent Resistance
    Resists motor oil, petrol, brake fluid, acetone, alcohols, and water.
  • Corrosion Protection
    Prevents fretting and corrosion in threaded joints.
  • Yellow Colour
    Easy visual identification during application.

Benefits

  • Prevents leakage and vibration loosening in pipe systems
  • Ideal for hydraulic and pneumatic pipe threads
  • Enables fast assembly with early handling strength
  • Allows maintenance-friendly disassembly
  • Improves system reliability and safety
Primary ApplicationSub-ApplicationsFunctional PurposeKey Performance Advantage
Hydraulic Pipe Thread SealingHydraulic pipe fittings, pressure linesSeal and lock threaded jointsSeals up to bursting pressure after full cure
Pneumatic System Pipe SealingPneumatic lines, air fittingsPrevent air leakage and looseningMedium strength with vibration resistance
Fine to Medium Pitch Pipe ThreadsPipe threads up to Ø 50 mmReliable sealing of close-fitting threadsOptimized viscosity for fine & medium threads
Serviceable Pipe AssembliesJoints requiring maintenanceAllows disassembly without damageMedium break & prevailing torque
Vibration-Exposed Pipe JointsPumps, compressors, machinery pipingPrevent vibration-induced looseningAnaerobic locking & sealing combined
Oil & Solvent-Exposed Pipe SystemsOil, fuel & solvent handling linesMaintain seal integrity in harsh environmentsExcellent chemical & solvent resistance
Industrial Fluid Transfer LinesProcess piping, utility systemsLong-term leak preventionCures without primer on most metals

Surface Preparation

  • Ensure threads are clean, dry, and free from grease or oil.
  • Proper cleaning ensures optimal sealing and cure performance.

Application Method

  1. Apply Fasto A750 to all engaged pipe threads.
  2. Assemble the joint and tighten within 10 minutes of application.
  3. Allow curing under anaerobic (air-excluded) conditions.
  4. Wipe off excess sealant from the outside of the joint.

Curing Guidelines

  • Fixture time: 2–8 minutes
  • Low-pressure sealing: Rapid sealing at low pressures during early cure
  • Full cure: 12 hours
  • Maximum recommended gap: 0.20 mm
  • Pipe size: Suitable up to Ø50 mm

Additional Notes

  • Cure speed depends on temperature, substrate, and bond gap.
  • At temperatures below 5°C, use Fasto AP49 Activator to accelerate cure (activator 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—testing recommended.

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