Fasto S985 - Fasto Adhesives & Sealants
Features of S985
Fasto S985 - Fasto Adhesives & Sealants
Features of S985

Fasto S985 – Automotive Grade, Flange Silicone Sealant

Fasto S985 is a one-part, high-performance, heavy-duty RTV silicone sealant formulated for demanding mechanical, automotive, and industrial sealing applications. Its neutral cure, non-corrosive, low-odor, and high oil-tolerant formulation ensures reliable performance even in oil-exposed and high-temperature environments.
The non-slumping property allows easy application on both vertical and horizontal surfaces.

Packaging:

Drum : 270kg

Bucket : 25kg

Cartridge : 300ml

- +

Key Features

  • Neutral Cure & Non-Corrosive
    Safe for metals and sensitive components.
  • High Oil Tolerance
    Performs reliably on oil-exposed surfaces and assemblies.
  • Heavy-Duty & High Strength
    Designed for mechanically stressed joints and flanges.
  • Wide Temperature Resistance
    Continuous service from -50°C to 220°C.
  • Non-Slump Application
    Ideal for vertical and overhead joints.
  • Low Odor & Easy Application
    Improves operator comfort during assembly and maintenance.

Benefits

  • Ensures leak-proof sealing in heavy-duty gearboxes and power assemblies
  • Reduces maintenance downtime and gasket replacement
  • Maintains joint integrity under thermal cycling and vibration
  • Suitable for industrial, automotive, and electrical applications
  • Provides durable, long-lasting performance in harsh conditions
Primary ApplicationSub-ApplicationsFunctional PurposeKey Performance Advantage
Gearbox & Power Transmission SealingGearbox flanges, power transmission assemblies, timing coversPrevent oil leakage under mechanical loadHigh oil tolerance, flexible neutral-cure seal
Engine & Automotive Component SealingOil sumps, engine covers, automotive housingsLeak-proof sealing in high-temperature zonesStable performance up to high operating temperatures
Pipe Flange & Mechanical Joint SealingPipe flanges, rigid mechanical jointsDurable joint sealing without slumpingNon-slumping, strong adhesion
Gasket, Stiffener & O-Ring SealingStatic gaskets, stiffeners, O-ring groovesForms in-place flexible sealsHigh elongation, long-term flexibility
Outdoor Equipment & Utility SealingStreetlights, exposed fixtures, outdoor assembliesEnvironmental & weather protectionWeather-resistant, non-corrosive
Solar Panel & Electrical Assembly SealingPanel frames, electrical enclosuresMoisture & contaminant protectionElectrically safe, flexible seal
Multi-Substrate Bonding & SealingMetal, composites, glass, plastics, rubberReliable bonding across dissimilar materialsBroad substrate compatibility

Surface Preparation

  • Clean all surfaces thoroughly to remove dust, oil, grease, rust, scale, and contaminants.
  • Use a suitable Fasto cleaner for optimal adhesion.

Application Method

  1. Apply Fasto S985 using a manual or pneumatic dispensing gun.
  2. Extrude a continuous, uniform bead onto the prepared surface.
  3. Assemble the mating parts immediately to avoid premature skin formation.
  4. Apply sufficient material to ensure proper sealing.
  5. Remove excess sealant after assembly, if required.

Curing Information

  • Skin formation: 20–25 minutes
  • Tack-free time: 30–40 minutes
  • Full cure: 24 hours
    (Curing time depends on ambient temperature, humidity, and joint thickness.)

To access Technical & Safety Documents, please submit your details.








    Related products

    Scroll to Top