Applications

LOCTITE® STYCAST CC 8555 – Urethane Acrylate Conformal Coating – Rugged UV/moisture curable protection from moisture and harsh chemicals

  • Item Name: LOCTITE® STYCAST CC 8555
  • Manufacturer: Henkel
  • Product category: Conformal Coating
  • Technologies: Urethane acrylate
  • Applications: Provides rugged, electrically insulating protection for electronic assemblies, rapidly gelling under UV light and fully curing via ambient moisture in shadowed areas.
  • Color: Clear liquid
  • Cure type: UV cure and room temperature moisture cure
  • Package size: Contact to Techniq VN for details
  • Shelf life: 1 year

1. Product Overview

LOCTITE® STYCAST CC 8555 is a one-component, UV-curable urethane acrylate conformal coating. It provides rugged protection against moisture and harsh chemicals while offering excellent adhesion to various substrates. The product gels rapidly under UV exposure and fully cures with atmospheric moisture, ensuring complete coverage even in shadowed areas. It is VOC/solvent-free and has good chemical and moisture resistance.

Key Features:

  • UV curable with room temperature moisture cure for shadowed areas
  • One-component, solvent-free formulation
  • Excellent moisture and chemical resistance
  • Good wettability and void-free application
  • V0 rating per UL 94 and RTI rating of 130°C per UL 746E
  • Compliant with IPC-CC-830 requirements

Operating Temperature: -40°C to 130°C

Key Substrates:

  • Metal surfaces
  • Ceramic
  • Glass-filled epoxy

2. Applications

  • Conformal coating for electronic assemblies
  • Protection against moisture, dust, and chemical exposure
  • Compatible with standard solder masks, no-clean fluxes, and metallization

3. Typical Properties

Uncured Properties Value
Appearance Clear liquid
Viscosity @ 25°C (mPa.s) 60
Specific Gravity @ 25°C (g/cc) 1.05
Shelf Life @ 25°C (days) 365
Curing Performance Condition Value
Recommended UV Cure Condition Medium-pressure mercury lamp 365 nm wavelength
Exposure Time 30 seconds
Light Intensity 300-600 mW/cm²
Moisture Cure for Shadowed Areas 50% RH, 25°C 72 hours
Cured Properties Value
Hardness (Shore A @ 20s) 77
Volume Resistivity (ohm-cm) 1.46×10¹⁴
Surface Resistivity (ohm) 1.27×10¹⁴
Dielectric Strength (kV/mm) 27.5
Dielectric Constant @ 1 MHz 2.51
Dissipation Factor @ 1 MHz 0.057
Tensile Strength (N/mm²) 10.4 (1,510 psi)
Tensile Elongation at Break (%) 31

Storage & Handling

  • Store in a dry location between 18-26ºC in an unopened container.
  • Avoid exposure to sunlight.
  • Once opened, purge containers with dry nitrogen to prevent contamination.
  • Do not return used material to the original container.

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