Applications

LOCTITE® SI 5033™ – Adhesive/Sealant – Encapsulating, Bonding, Gasketing or Sealing

Item Name: LOCTITE® SI 5033™
Manufacturer: Henkel
Technologies: Silicone
Color: Light yellow, translucent paste
Cure Type: Ultraviolet (UV)/ visible light with secondary moisture cure
Package Size: Contact to Avantek for details.
Shelf Life: Contact to Avantek for details.

1. Product Overview

  • Technology: Silicone
  • Chemical Type: Acetoxy dual cure silicone
  • Appearance (Uncured): Light yellow, translucent paste
  • Fluorescence: Positive under UV light
  • Components: One component (no mixing required)
  • Thixotropic: Reduced migration after application
  • Cure Mechanism: Ultraviolet (UV)/visible light with secondary moisture cure
  • Applications: Encapsulation, Bonding, Gasketing, Sealing
  • Benefits: Deep light cure capability, high-strength rubber formation for gasketing and sealing

2. Applications

  • Encapsulation of electronic components
  • Bonding various substrates including glass, polycarbonate, metals, and plastics
  • Gasketing & Sealing applications requiring high-strength rubber

3. Typical Properties

Uncured Properties

Property Value
Specific Gravity @ 25°C 1.09
Solids Content (%) 95.7
Aspect Ratio (Height/Width) 1.0
Flow (ISO 7390, mm) 2.5
Extrusion Rate (g/min @ 0.6 MPa, 25°C) 100-170

Curing Performance

Property Value
Skin Over Time (23°C, 50% RH, min) ≤15
Tack Free Time (ASTM C679, sec) ≤20
Depth of Cure (60 sec @ 70 mW/cm², mm) ≥10

Cured Properties

Property Value
Shore Hardness (A) 45-65
Elongation at Break (%) ≥150
Tensile Strength (N/mm²) ≥2.75 (398 psi)
Tear Strength (N/mm) 14.0 (79.9 lb/in)
Water Absorption (24h, % ISO 62) 0.32
Volume Shrinkage (%) 0.62
Linear Shrinkage (%) 0.21
Volume Resistivity (Ω·cm) 1.1×10¹⁵
Dielectric Breakdown Strength (kV/mm) 16.2
Dielectric Constant (1 kHz / 1 MHz) 2.92 / 2.92

Adhesion Strength (Lap Shear, ISO 4587, N/mm²)

Substrate Combination Strength (psi)
Aluminum to Glass 1.0 (140)
Steel to Glass 0.8 (110)
Glass to Glass 2.9 (425)
Polycarbonate to Polycarbonate 2.7 (390)
Polycarbonate to Glass 1.4 (200)
PVC to Glass 4.1 (595)
Nylon to Glass 3.3 (480)

Environmental Resistance

Aging Condition Durometer Change Tensile Strength Change (%) Elongation Change (%)
177°C for 168h -4 3.7 17.5
233°C for 168h +25 -34.3 -92.3
Ethylene glycol/water 50:50 @100°C (168h) -12 -34.8 54.6
ASTM IRM 903 oil @150°C (70h) -22 -40.8 -26.2
5W30 oil @150°C (168h) -42 -80.4 8.5
ATF Dexron® III @150°C (168h) -45 -87.2 34.1

Everwide FX244-1: High Performance for Precision Molding

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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