Applications

LOCTITE SI 5290

  • Item Name: LOCTITE SI 5290
  • Manufacturer: Henkel
  • Product Category: Conformal Coating
  • Technologies: Silicone (Alkoxy silicone)
  • Applications: Provides environmental protection for printed circuit boards and other sensitive electronic components.
  • Color: Transparent amber to yellow liquid
  • Cure Type: Ultraviolet (UV) light cure with secondary moisture cure
  • Package Size: Contact Avantek for details.
  • Shelf Life: Contact Avantek for details.

1. Product Overview

  • Technology: Silicone
  • Type: Alkoxy silicone, one-component
  • Curing: Ultraviolet (UV) light with secondary moisture cure
  • Appearance: Transparent amber to yellow liquid
  • Application: Conformal coating for PCB and sensitive electronics
  • Key Features:
    • Environmental protection
    • Enhances shock absorption
    • Operating temperature: -53 °C to 204 °C

2. Applications

  • Protects printed circuit boards (PCB) and electronic components from environmental exposure.
  • Designed for applications where UV curing is needed for rapid strength development.
  • Secondary moisture cure ensures coverage of shadowed areas.

3. Typical Properties

Properties Uncured Cured
Viscosity (mPa·s, 25°C) 100 – 350
Specific Gravity (@ 25°C) 1.0
Non-Volatile Content (%) ≥92
Shore Hardness (OO) 70 – 85
Elongation (%) 15
Tensile Strength (N/mm²) 0.5 (70 psi)
Tear Strength (N/mm) 0.8 (5 lb/in)
Glass Transition (°C) -45
Thermal Conductivity (W/m·K) 0.15
Water Absorption (24h @ 23°C, %) 0
Water Vapor Transmission Rate (g/h·m²) 1.7
Dielectric Strength (kV/mm) 18
Volume Resistivity (Ω·cm) 2×10¹⁴

4. Curing Performance

  • UV Cure: Minimum irradiance of 70 mW/cm² for 20-40 sec
  • Secondary Cure: Moisture cure begins upon exposure to air; full performance in 72 hours
  • Tack-Free Time:
    • UV Cure: 20-40 sec
    • Moisture Cure (@ 25°C, 50% RH): ≤18.3 hours
  • UV Depth of Cure: ≥0.9 mm

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FX244-1 A specialized two-part silicone rubber designed for creating high-precision molds. This material features a unique oil-bleeding property that creates a self-releasing surface, eliminating the need for external non-stick sprays during demolding.

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Partial Gasket & Seal Strategies Using Henkel Loctite SI 5910

Gasket sealing is a core part of many industrial assembly and maintenance operations — from automotive engine housings to HVAC covers and machinery flanges. When selecting a gasketing solution, you need something that forms reliably in place, resists movement and fluids, and simplifies application — which is where Henkel Loctite SI 5910 fits perfectly

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