Applications

LOCTITE® SI 5293 – Alkoxy silicone conformal coating – Environmental protection for printed circuit boards

  • Item Name: LOCTITE® SI 5293
  • Manufacturer: Henkel Corporation
  • Product category: Conformal coating
  • Technologies: One-component, solvent-free alkoxy silicone system that cures under UV light with secondary moisture cure for shadowed areas
  • Applications: Provides environmental protection for printed circuit boards and sensitive electronic components.
  • Color: Transparent amber to yellow (uncured) with positive UV fluorescence
  • Cure type: Ultraviolet (UV) cure
  • Package size: Contact to Techniq VN for details
  • Shelf life: Contact to Techniq VN for details

1. Product Overview

LOCTITE® SI 5293 is a one-component, UV-curable alkoxy silicone conformal coating designed to provide environmental protection for printed circuit boards (PCBs) and other sensitive electronic components. It fluoresces under UV light and has a secondary moisture cure for shadowed areas.

2. Applications

  • Conformal coating for PCBs
  • Protection of sensitive electronic components
  • UV and moisture cure for enhanced durability

3. Typical Properties

Uncured Properties
Property Value
Appearance Transparent amber to yellow liquid
Specific Gravity @ 25°C 1.0
Flash Point See SDS
Viscosity (Brookfield RVT, Spindle 1, 10 rpm) 400 to 800 cP
Solids Content ≥85%
Curing Performance
Property Value
UV Cure Wavelength 365 nm
Surface Tack-Free Time @ 22°C / 50% RH 10 to 24 hours
Full Cure Time at Ambient Conditions 72 hours
Cured Properties (after 7 days at 22°C, 50% RH)

Physical Properties:

Property Value
Coefficient of Thermal Expansion 300 × 10⁻⁶ K⁻¹
Thermal Conductivity 0.18 W/(m·K)
Glass Transition Temperature (Tg) -40°C
Water Vapor Transmission Rate 1.23 – 1.37 g/(h·m²)

Electrical Properties:

Property Value
Volume Resistivity 1×10¹⁴ Ω·cm
Dielectric Breakdown Strength 16 kV/mm
Dielectric Constant / Dissipation Factor
@ 100 Hz 4.6 / 0.005
@ 1 kHz 4.1 / 0.006
@ 1 MHz 4.1 / 0.006

Other Cured Properties:

Property Value
Shore Hardness (Durometer OO) 60 to 90
UV Depth of Cure ≥1.3 mm

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