• Item Name: LOCTITE® SI 5091™
• Manufacturer: Henkel
• Technologies: Acetoxy silicone, Silicone technology
• Color: Translucent liquid
• Cure Type: Ultraviolet (UV) light with secondary moisture cure
• Package Size: Contact Henkel for details
• Shelf Life: Contact Henkel for details
LOCTITE® SI 5091™ is a one-component, UV-curable acetoxy silicone adhesive in a translucent liquid form. It is self-leveling, providing uniform cavity fill, and develops secondary cure via moisture for shadowed areas. The product offers medium strength and high flexibility, enhancing load-bearing and shock-absorbing properties of the bonded area. It is suitable for potting, coating, and sealing applications in automotive, electronic, military, and industrial components.
Potting, coating, and sealing of automotive, electronic, military, and industrial components
Substrates requiring flexibility and shock absorption
Classified UL® E257711 for plastics and components (regional approval)
Uncured Material
| Property | Value |
|---|---|
| Specific Gravity @ 25 °C | 1.01 |
| Solids / Non-Volatile Content | >95% |
| Flash Point | See SDS |
| Viscosity, Brookfield RVT, 25 °C, Spindle 3, 10 rpm | 4,000–6,000 mPa·s (cP) |
| Cure Method | UV light; moisture for shadowed areas |
| Tack Free Time | ≤20 seconds (@ 75 mW/cm² UV) |
| Skin Over Time (moisture cure only) | ≤15 minutes |
| Depth of Cure (shadowed areas) | ≤6 mm (24 h) |
Cured Material (Cured 40–75 mW/cm² + 3–7 days @ 22 °C / 50% RH)
| Property | Value |
|---|---|
| Coefficient of Thermal Expansion | 2.82×10⁻⁴ K⁻¹ |
| Water Absorption (24 h) | 0% |
| Shrinkage | 0.2% |
| Tear Strength | 0.7 N/mm (4 lb/in) |
| Water Vapor Transmission Rate | 0.458 g/(h·m²) |
| Compression Set | 5–52% (22–100 °C, 70 h) |
| Dielectric Constant / Dissipation Factor | 100 Hz: 2.87 / 0.003, 100 kHz: 2.88 / 0.0027 |
| Volume Resistivity | 3.3×10¹³ Ω·cm |
| Dielectric Breakdown Strength | 18 kV/mm |
| Shore Hardness (Durometer A) | 31–37 |
| Elongation at break | ≥75% |
| Tensile Strength | ≥0.6 N/mm² (≥87 psi) |
| UV Depth of Cure | ≥3.7 mm |
| Lap Shear Strength (various substrates) | 0.01–0.6 N/mm² (1–85 psi) |
| 180° Peel Strength | Aluminum / Steel: <0.01 N/mm (<0.05 lb/in) |
| Heat Aging (% initial strength at RT) | Maintains strength up to 5 weeks at 150–200 °C |
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