Fasto A474 - Flange Sealants
Features of A474
Fasto A474 - Flange Sealants
Features of A474

Fasto A474 – Medium Strength Anaerobic Flange Sealant Form-In-Place Gasket

Fasto A474 is a single-component, medium strength, fast-curing anaerobic gasket compound designed as a form-in-place gasket (FIPG) for rigid metal flanges and flat mating surfaces. It cures in the absence of air when confined between close-fitting metal surfaces, forming a durable, vibration-resistant, and leak-proof seal.

Its thixotropic, non-drip formulation ensures clean application without run-off, while providing an almost instant low-pressure seal, enabling early on-line pressure testing.

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Key Features

  • Form-In-Place Gasket Technology
    Eliminates pre-cut gaskets and reduces inventory.
  • Medium Strength Sealing
    Suitable for serviceable flange joints.
  • Fast Curing on Steel Surfaces
    Fixture time 4–10 minutes.
  • Very High Viscosity, Thixotropic
    Approx. 110,000 cPs (low shear) – prevents run-off on vertical flanges.
  • Instant Low-Pressure Seal
    Seals up to 0.5 bar within ~20 minutes.
  • Good Gap Filling Capability
    Effective up to 0.35 mm.
  • Wide Operating Temperature Range
    -50°C to +150°C (continuous).
  • Excellent Chemical & Solvent Resistance
    Resistant to motor oil, petrol, brake fluid, acetone, ethanol, propanol, and water.
  • Red-Orange Colour
    Easy visual inspection after application.

Benefits

  • Prevents oil, coolant, and fluid leakage
  • Withstands vibration and thermal cycling
  • Reduces assembly time and gasket costs
  • Enables early pressure testing
  • Improves reliability of industrial and automotive assemblies
Primary ApplicationSub-ApplicationsFunctional PurposeKey Performance Advantage
Form-in-Place Gasket (FIPG) SealingRigid metal flanges, machined mating surfacesReplace conventional cut gasketsUniform gasket formation, no creep or shrinkage
Gearbox & Transmission Housing SealingGearbox casings, transmission coversPrevent oil leakage from housingsFast curing with excellent oil resistance
Pump & Compressor Housing SealingPump housings, compressor end capsMaintain pressure integrityAlmost instant low-pressure seal for testing
Machinery Cover & Inspection Plate SealingMachinery covers, access platesLeak-proof sealing on flat surfacesThixotropic, non-drip application
OEM Assembly Gasket SealingFactory-assembled metal componentsImprove production efficiencyQuick cure on steel surfaces
Maintenance & Overhaul ApplicationsEquipment servicing & reassemblyReliable resealing after dismantlingEasy removal without surface damage
Oil, Fuel & Solvent-Exposed JointsOil-filled housings, fluid systemsLong-term sealing durabilityExcellent chemical & solvent resistance

Surface Preparation

  • Ensure mating surfaces are clean, dry, and free from grease, oil, and contaminants.
  • Trials are recommended to determine if additional cleaning is required.

Application Method

  1. Apply Fasto A474 evenly to all sealing areas.
  2. Assemble parts immediately to exclude air.
  3. Tighten fasteners as per assembly specifications.
  4. Allow curing under anaerobic (air-excluded) conditions.
  5. Wipe off excess material from the outside of the joint.

Curing Guidelines

  • Fixture time: 4–10 minutes
  • Low-pressure seal: up to 0.5 bar in ~20 minutes
  • Full cure: 12 hours
  • Maximum recommended gap: 0.35 mm

Additional Notes

  • Cure speed depends on temperature, bond gap, and substrate.
  • At temperatures below 5°C or on inert metals, use Fasto AP49 Activator to accelerate cure (activator may reduce final strength by up to 25%).
  • Anaerobic products are not recommended for pure oxygen or chlorine systems.
  • Not recommended for certain plastics due to potential stress cracking.

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