Fasto - A418 - Flange Sealants

Fasto A418 – Medium Strength Anaerobic Form-In-Place Gasket

Fasto A418 is a single-component, medium-strength 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 flexible, vibration-resistant, and leak-proof seal.

With its very high viscosity, thixotropic formulation, Fasto A418 stays exactly where applied and delivers an almost instant low-pressure seal (up to 0.5 bar in ~20 minutes), allowing early on-line pressure testing.

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Key Features

  • Form-In-Place Gasket Technology
    Eliminates the need for pre-cut gaskets.
  • Medium Strength – Serviceable Joints
    Allows controlled disassembly during maintenance.
  • Very High Viscosity, Thixotropic
    Approx. 500,000 cPs (low shear) – prevents run-off on vertical flanges.
  • Instant Low-Pressure Seal
    Seals up to 0.5 bar in ~20 minutes.
  • Good Gap Filling Capability
    Effective up to 0.5 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 Colour
    Easy visual inspection after assembly.

Benefits

  • Prevents oil, coolant, and fluid leakage
  • Withstands vibration and thermal cycling
  • Reduces assembly time and gasket inventory
  • Provides uniform sealing pressure
  • 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 mating surfaces Replace pre-cut gaskets on metal joints Very high viscosity, excellent gap filling
Gearbox & Transmission Housing Sealing Gearbox casings, transmission covers Prevent oil leakage from housings High tensile shear strength with oil resistance
Pump, Compressor & Turbine Housing Sealing Pump housings, compressor end caps, turbine casings Maintain pressure integrity in heavy equipment Handles larger flange gaps up to 0.5 mm
Machinery Cover & Flange Sealing Machinery covers, inspection plates Leak-proof sealing under vibration Thixotropic, non-drip application
Heavy-Duty Industrial Assemblies Industrial & automotive assemblies Long-term sealing under mechanical load Excellent vibration & shock resistance
Maintenance & Overhaul Applications Equipment servicing & reassembly Reliable resealing after dismantling Easy removal without damaging surfaces
Oil, Fuel & Solvent-Exposed Joints Oil-filled housings, fluid systems Durable sealing in aggressive environments Excellent chemical & solvent resistance

Surface Preparation

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

Application Method

  1. Apply Fasto A418 evenly to all engaged sealing areas.
  2. Assemble parts immediately to exclude air from the joint.
  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
  • Functional seal: up to 0.5 bar in ~20 minutes
  • Full cure: 12 hours
  • Maximum recommended gap: 0.5 mm

Additional Notes

  • Cure speed depends on temperature, bond gap, and substrate.
  • At temperatures below 5°C, use Fasto AP49 or AP69 Activator to accelerate curing (activator may reduce final strength by up to 30%).
  • 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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