• Item Name: LOCTITE® SI 5031™
• Manufacturer: Henkel
• Technologies: Silicone, Acetoxy
• Color: Light yellow, translucent
• Cure Type: 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 5031™ is a one-component, flowable acetoxy silicone adhesive that cures under UV and visible light, with a secondary moisture cure for shadowed areas. It forms a medium-strength, flexible sealant suitable for potting, coating, and sealing in automotive, electronic, military, and industrial applications. The product is self-leveling, allowing uniform cavity fill, and develops functional strength almost instantly, with full performance achieved over 72 hours at ambient conditions.
Potting, coating, and sealing of electronic and automotive components
Encapsulation of industrial or military devices
Applications requiring self-leveling for uniform cavity fill
Areas with shadowed surfaces where moisture cure is needed
| Property | Uncured | Cured | Unit | Test Method |
|---|---|---|---|---|
| Appearance | Light yellow, translucent | – | – | Visual |
| Specific Gravity @ 25°C | 1.01 | – | – | – |
| Viscosity (Brookfield, Spindle 3, 10 rpm, 25°C) | 5,800 | – | mPa·s | – |
| Skin Over Time | – | 20 | min | 23°C / 50% RH |
| Tack Free Time | – | 20 | sec | 70 mW/cm², 365 nm |
| Depth of Cure (UV/Visible light, 90 sec) | – | 4–41 | mm | Depends on light source |
| Lap Shear Strength: Aluminum to Glass | – | 2 | N/mm² (290 psi) | ISO 4587 |
| Lap Shear Strength: Steel to Glass | – | 1 | N/mm² (150 psi) | ISO 4587 |
| Lap Shear Strength: Nylon to Glass | – | 5 | N/mm² (725 psi) | ISO 4587 |
| Heat Aging @ 177°C, 168h | – | Durometer -8; Tensile -6%; Elongation +18% | – | – |
| Heat Aging @ 233°C, 168h | – | Durometer +24; Tensile +61%; Elongation -66% | – | – |
| Fluid Resistance | – | Varies with fluid (Durometer, Tensile, Elongation, Volume Swell) | – | Various oils/glycols |
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