Fasto A475 - Flange Sealants

Fasto A475 – Medium Strength Anaerobic Flange Sealant Liquid Gasket

Fasto A475 is a single-component, medium strength, anaerobic liquid gasket compound specially designed for sealing horizontal and vertical rigid metal surfaces. It cures in the absence of air when confined between close-fitting flat metal surfaces, forming a durable, vibration-resistant, and leak-proof seal.

Its thixotropic formulation ensures controlled application without run-off, while delivering an almost instant low-pressure seal (up to 0.5 bar in ~15 minutes), allowing early on-line pressure testing.

Fasto A475 cures very quickly on steel surfaces, making it ideal for OEM production lines and maintenance operations.

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Key Features

  • Form-In-Place Gasket (FIPG) Technology
    Eliminates pre-cut gaskets and reduces inventory.
  • Medium Strength Sealing
    Allows reliable sealing with serviceable disassembly.
  • Fast Cure on Steel Surfaces
    Fixture time: 5–15 minutes.
  • Thixotropic, Non-Drip Liquid
    Viscosity approx. 105,000 cPs (low shear).
  • Instant Low-Pressure Seal
    Up to 0.5 bar within ~15 minutes.
  • Good Gap Filling Capability
    Effective up to 0.25 mm.
  • Wide Operating Temperature Range
    -60°C to +150°C (continuous).
  • Excellent Chemical & Solvent Resistance
    Resistant to oils, fuels, brake fluid, acetone, alcohols, and water.
  • Orange Colour
    Easy visual inspection after application.

Benefits

  • Prevents oil, coolant, and fluid leakage
  • Reduces assembly time and gasket costs
  • Enables early pressure testing
  • Performs reliably under vibration and thermal cycling
  • Ideal for industrial and automotive flange assemblies.
Primary Application Sub-Applications Functional Purpose Key Performance Advantage
Form-in-Place Gasket (FIPG) Sealing Rigid metal flanges, machined surfaces Replace pre-cut gaskets with liquid sealing Uniform gasket formation without shrinkage
Gearbox & Transmission Casing Sealing Gearbox housings, transmission covers Leak-proof sealing of machined joints Medium strength with high oil resistance
Pump & Compressor Housing Sealing Pump housings, compressor end caps Maintain pressure integrity Almost instant low-pressure seal
Machinery Cover & Flange Sealing Machine covers, inspection plates Prevent fluid leakage High viscosity prevents run-off
OEM Assembly Gasket Sealing Factory-assembled metal components Fast curing for production efficiency Quick fixture time on steel surfaces
Maintenance & Overhaul Applications Equipment servicing & reassembly Reliable resealing after disassembly Easy gasket removal without surface damage
Oil & Solvent-Exposed Joint Sealing Oil-filled housings, solvent environments Long-term chemical resistance Resistant to oils, fuels & solvents

Surface Preparation

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

Application Method

  1. Apply Fasto A475 evenly to all engaged sealing areas.
  2. Assemble parts immediately to exclude air from the joint.
  3. Tighten fasteners as per assembly specification.
  4. Allow curing under anaerobic (air-excluded) conditions.
  5. Wipe off excess material from outside the joint.

Curing Guidelines

  • Fixture time: 5–15 minutes
  • Low-pressure seal: up to 0.5 bar in ~15 minutes
  • Full cure: 10 hours
  • Maximum recommended gap: 0.25 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 (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 possible stress cracking.

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