Fasto SP70 - Silicone Sealants & Adhesives

Fasto SP70 – Solar Grade Junction Box Potting Compound

Fasto SP70 is a two-part, PV-grade, neutral cure, silicone-based potting and encapsulating compound developed for long-term protection of electronic and solar components. Its low viscosity and self-leveling nature ensure complete filling of cavities, delivering superior sealing, insulation, and vibration resistance in demanding environments.

Packaging:

Part – A : 12 kg

Part B: 1 kg (2 pieces)

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Key Features

  • Two-Part Neutral Cure System
    Ensures controlled curing and excellent adhesion without corrosion.
  • Low Viscosity & Self-Leveling
    Easily flows into complex cavities and fills voids uniformly.
  • Non-Corrosive & Electronics-Safe
    Does not corrode circuits, contacts, or sensitive electronic components.
  • Excellent Environmental Resistance
    Resistant to UV radiation, moisture, ozone, vibration, pollutants, and temperature extremes.
  • High Electrical Insulation Properties
    Provides reliable dielectric strength and volume resistivity.
  • UL94 Tested & PV Grade
    Suitable for solar and electronic encapsulation applications.

Benefits

  • Extends service life of solar junction boxes and electronics
  • Protects components from moisture ingress, dust, and vibration
  • Enhances thermal and electrical reliability
  • Prevents cracking, shrinkage, and mass loss over time
  • Ideal for renewable energy, electronics, and OEM applications
Primary Application Sub-Applications Functional Purpose Key Performance Advantage
Junction Box Potting & Sealing Solar panel JBs, electrical junction boxes, outdoor connection boxes Complete filling & sealing of enclosures Self-leveling, non-corrosive, UV & moisture resistant
PCB & Control Unit Encapsulation PCBs, electronic control units, automation boards Electrical insulation & mechanical protection High dielectric strength, vibration damping
Relay & Driver Protection Relays, LED drivers, switching modules Prevent corrosion & electrical failure Non-corrosive to contacts, stable insulation
Power Module Encapsulation Power supplies, converters, control modules Thermal & electrical protection Supports thermal management, heat resistant
Vibration-Prone Electronics Potting Mobile equipment electronics, machinery-mounted units Absorbs mechanical stress & vibration Flexible cured structure, high elongation
Outdoor Electronics Protection Weather-exposed electronics, lighting electronics Long-term environmental protection UV, ozone & pollutant resistance
Electrical & Thermal Insulation High-voltage components, insulated housings Electrical safety & insulation High volume resistivity, stable over time

Surface Preparation

  • Ensure surfaces are clean, dry, and free from dust, grease, oil, rust, and contaminants.
  • Clean surfaces using a suitable Fasto cleaner for best results.

Mixing Instructions

  • Mix Part A and Part B thoroughly in the recommended ratio:
    • 4:1 (by volume)
    • 6:1 (by weight)
  • Mix until a uniform, streak-free compound is obtained.

Application Method

  1. Pour or dispense Fasto SP70 directly into the potting or encapsulation area.
  2. Allow the material to self-level and fill the cavity completely.
  3. Avoid air entrapment during mixing and pouring.
  4. Remove excess material if required.

Curing Information

  • Pot life: approx. 12 minutes
  • Handling time: approx. 45 minutes
  • Full cure: 24 hours (at ambient conditions)

Joint & Encapsulation Guidelines

  • Suitable for potting junction boxes, drivers, relays, and electronic assemblies
  • For larger joints or sealing applications, use backer rod or bond breaker tape
  • Use masking tape for clean edges and remove it before skin formation

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

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