Applications

LOCTITE® SI 5039™ – Silicone Sealant Dual Cure

• Item Name: LOCTITE® SI 5039™
• Manufacturer: Henkel
• Technologies: Silicone (Acetoxy dual cure)
• Color: Light yellow, translucent
• 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

LOCTITE® SI 5039™ is a one-component, acetoxy dual-cure silicone sealant that provides deep light cure capability using ultraviolet (UV) and visible light, with secondary moisture curing for shadowed areas. It forms a high-strength rubber for gasketing, bonding, or sealing applications. The sealant is semi-flowable and facilitates continuous bead formation.

2. Applications

  • Cure-in-place gasketing
  • Bonding and sealing applications
  • Used in industrial and electronic component assembly

3. Typical Properties

Uncured Properties

Property Value
Specific Gravity @ 25°C 1.05
Solids Content (%) 96.8
Flow, ISO 7390 (mm) 15.2
Extrusion Rate (g/min) 150 to 320
Skin Over Time (min) ≤20
Tack Free Time (sec) ≤20

Cured Properties

Property Value
Shore Hardness (A) 32 to 48
Elongation at Break (%) ≥150
Tensile Strength (N/mm²) ≥1.0
Tear Strength (N/mm) 8.3
Volume Shrinkage (%) 0.44
Linear Shrinkage (%) 0.15

Adhesion Performance (Lap Shear Strength, ISO 4587)

Substrate Combination Strength (N/mm²) Strength (psi)
Aluminum to Glass 0.9 125
Steel to Glass 1.1 155
Glass to Glass 2.1 305
Polycarbonate to Glass 2.9 420
PVC to Glass 3.6 520
Nylon to Glass 3.9 560

Environmental Resistance

  • Heat Aging: No significant changes in tensile strength up to 177°C.
  • Fluid Immersion: Resistant to glycol/water mixtures; shows volume swell in oils.

Electrical Properties

Property Value
Volume Resistivity (Ω·cm) 6.7×10¹⁴
Dielectric Breakdown Strength (kV/mm) 19.1
Dielectric Constant (1 kHz) 2.88
Dissipation Factor (1 kHz) 0.008

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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