• Item Name: LOCTITE® SI 5039™
• Manufacturer: Henkel
• Technologies: Silicone, Acetoxy dual cure
• Color: Light yellow, translucent paste
• Cure Type: Ultraviolet (UV)/Visible light with secondary moisture cure
• Package Size: Contact to Techniq VN for details.
• Shelf Life: Contact to Techniq VN for details.
LOCTITE® SI 5039™ is a one-component, acetoxy-based silicone sealant with dual cure technology (UV/visible light and moisture). It is semi-flowable, light yellow, and translucent, designed to form high-strength rubber upon curing. Its unique flow characteristics allow even bead formation for consistent gasketing, bonding, and sealing, including shadowed areas where moisture initiates secondary cure. The product combines deep light cure capability with a moisture cure mechanism, offering rapid functional strength and long-term durability.
Cure-in-place gasketing
Bonding and sealing of various substrates
Applications requiring UV/visible light cure with secondary moisture cure in shadowed areas
Suitable for metals, glass, polycarbonate, PVC, PBT, ABS, and nylon surfaces
Uncured Material
| Property | Value |
|---|---|
| Specific Gravity @ 25 °C | 1.05 |
| Solids/Non-Volatile Content | 96.8 % |
| Aspect Ratio @ 60 s (H/W) | 0.85 |
| Flow, ISO 7390 | 15.2 mm |
| Extrusion Rate (0.6 MPa, 15 s, 25 °C) | 150–320 g/min |
| Skin Over Time (25 °C, 50 % RH) | ≤20 min |
| Tack Free Time (365 nm, 70 mW/cm²) | ≤20 s |
| Depth of Cure (UV/Visible, 60 s) | ≥10 mm |
| Depth of Cure (Moisture only) | Progressive over days |
Cured Material
| Property | Value |
|---|---|
| Shore Hardness (A) | 32–48 |
| Elongation at Break | ≥150 % |
| Tensile Strength | ≥1.0 N/mm² |
| Tear Strength | 8.3 N/mm |
| Coefficient of Thermal Expansion | 324×10⁻⁶ K⁻¹ |
| Water Vapor Transmission Rate | 2.87 g/(h·m²) |
| Water Absorption (24 h) | 0.28 % |
| Linear Shrinkage | 0.15 % |
| Gas Permeability | O₂: 5.75×10⁻⁶, H₂: 6.10×10⁻⁶, CO₂: 4.62×10⁻⁵ cm²/sec/atm |
| Electrical Properties | Volume resistivity: 6.7×10¹⁴ Ω·cm, Dielectric breakdown: 19.1 kV/mm, Dielectric constant: 2.88 |
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