Fasto S890 - Silicone Sealants & Adhesives

Fasto S890 – Gap Filling, High-Performance RTV Sealant

Fasto S890 is a one-part, low-odour, neutral cure, RTV silicone sealant developed for flexible, durable, and weather-resistant sealing across industrial, electrical, automotive, and construction applications. It cures at room temperature to form a tough yet elastic rubber seal, providing excellent adhesion, moisture resistance, and long-term reliability on a wide variety of substrates.

Its non-corrosive formulation makes it safe for sensitive metals and electrical assemblies, while its paintable surface after curing ensures clean, professional-looking joints in visible sealing areas.

Packaging Type :-

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Key Features

  • One-Part Neutral Cure System
    Provides easy application with non-corrosive curing, safe for metals and electrical components.
  • Low Odour Formulation
    Comfortable to use in enclosed or indoor environments.
  • Excellent Weather & Moisture Resistance
    Performs reliably in indoor and outdoor conditions.
  • High Flexibility & Elongation
    Accommodates joint movement, vibration, and thermal expansion.
  • Paintable After Cure
    Allows aesthetic finishing without cracking or peeling.
  • Wide Substrate Compatibility
    Bonds well to metals, glass, ceramics, plastics, rubber, concrete, and wood.

Benefits

  • Ensures long-lasting, flexible sealing

  • Protects joints from water ingress, dust, and environmental exposure

  • Reduces risk of corrosion on sensitive substrates

  • Maintains seal integrity under vibration and temperature changes

  • Delivers clean, professional finishes in visible joints

Primary Application Sub-Applications Functional Purpose Key Performance Advantage
Industrial Sealing Pumps, machinery housings, equipment joints Prevent leakage & ingress Flexible, moisture resistant
HVAC & Duct Sealing Air-conditioning ducts, ventilation systems Air & moisture sealing Weather resistant, durable
Electrical Assembly Sealing Electrical enclosures, control panels Protection from dust & moisture Non-corrosive, electronics-safe
Construction Joints Concrete joints, ceramic joints, gaps Joint sealing & movement absorption High elasticity, paintable
Automotive & Mechanical Sealing Vehicle components, mechanical housings Vibration & fluid resistance Strong adhesion, flexible cure
General Purpose Sealing Metal, wood, glass & composite joints Long-term sealing Wide substrate compatibility

Surface Preparation

  • Ensure all surfaces are clean, dry, and free from dust, grease, oil, rust, release agents, and other contaminants.

  • Clean surfaces using a suitable Fasto cleaner for best adhesion and performance.

Application Method

  • Apply Fasto S890 using a manual or pneumatic dispensing gun.

  • Assemble the parts immediately after application to avoid premature skin formation.

  • Tool the sealant before skin-over time to achieve a smooth and uniform joint.

  • Remove excess sealant if required.

  • Use masking tape for clean joint lines and remove it immediately after tooling and before skin formation.

Curing Information

  • Skin-over time: approx. 15–25 minutes

  • Tack-free time: approx. 25–35 minutes

  • Full cure: 24 hours (at ambient conditions)
    (Curing time may vary depending on temperature, humidity, and joint thickness.)

Joint & Sealing Guidelines

  • Suitable for sealing static and low-movement joints

  • Ideal for metal, ceramic, concrete, wood, and composite joints

  • For wider joints, ensure sufficient sealant depth for flexibility

  • Avoid application in pure oxygen or oxygen-rich environments

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








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