Applications

LOCTITE STYCAST SC 3613 – Silicone Protective Coating – LEDs, LED display coating, IC and hybrid passivation

  • Item Name: LOCTITE STYCAST SC 3613
  • Manufacturer: Henkel
  • Product category: Protective Coating
  • Technologies: Silicone
  • Applications: Ideal for optoelectronic and semiconductor applications such as LED display coating and IC/hybrid passivation, minimizing alpha particle interactions.
  • Color: Clear
  • Cure type: Heat cure
  • Package size: Contact to Techniq VN for details
  • Shelf life: 3 months at 4°C; 9 months at -40°C

1. Product Overview

LOCTITE STYCAST SC 3613 is a one-component, optically clear, elastomeric silicone protective coating designed for the optoelectronic and semiconductor industries. It offers low-temperature cure, high purity, low stress, thixotropic properties, and low viscosity, making it ideal for applications requiring high reliability. The coating minimizes alpha particle interactions with sensitive circuitry.

2. Applications

  • LEDs and LED display coatings
  • IC and hybrid passivation
  • General protective coating applications in electronics

3. Typical Properties

Uncured Material

Property Value
Viscosity (Brookfield) 3,500 mPa·s (cP)
Specific Gravity 0.96 – 1.0
Percent Solids 100%
Shelf Life (@ 4°C) 3 months
Shelf Life (@ -40°C) 9 months

Curing Performance

Cure Condition Time
175°C <5 minutes
160°C 10 minutes
120°C 30 minutes
Post Cure (Recommended) 1-2 hours @ 150°C

Cured Material Properties

Property Value
Shore Hardness (ISO 868, Durometer A) 30
Extractable Ionic Content (ppm) <3 (Halogen or Alkali Metals)

Electrical Properties

Property Value
Dielectric Constant (1 kHz) 3.01
Dissipation Factor (1 kHz) 0.001
Dielectric Breakdown Strength ≥23 kV/mm
Volume Resistivity ≥2×10¹⁵ Ω·cm

Storage and Handling

  • Store at +4°C in a dry location (unopened container).
  • Avoid contamination from butyl/chlorinated rubbers, amines, sulfur, tin compounds, and heavy metals, as they may inhibit curing.
  • Can be diluted with electronic-grade solvents (e.g., Xylene, toluol) for reduced viscosity.
  • Application methods: Brush, flow coating, or dipping.

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