• Item Name: LOCTITE® SI 5248™
• Manufacturer: Henkel
• Technologies: Alkoxy silicone, one-component, UV cure with secondary moisture cure
• Color: Straw colored
• Cure Type: UV light primary cure, moisture secondary cure
• Package Size: Contact Henkel for details
• Shelf Life: Optimal storage 8–21°C; storage below 8°C or above 28°C may affect properties
LOCTITE® SI 5248™ is a one-component alkoxy silicone sealant with thixotropic properties that reduce migration after application. It is initially cured by ultraviolet (UV) light and has a secondary moisture cure for shadowed areas. The product provides flexibility for load-bearing and shock-absorbing applications. Biocompatibility testing according to ISO 10993 standards makes it suitable for certain medical device applications.
Gasketing
Sealing
| Property | Uncured | After Mixing / Cured |
|---|---|---|
| Specific Gravity @ 23°C | 1.05 | – |
| Solids / Non-Volatile Content, % | ≥95 | – |
| Viscosity, Brookfield RVT, 25°C, mPa·s (cP) | 50,000–80,000 | – |
| Cure Type | UV light; secondary moisture | Fully cured after 7 days @ 22°C / 50% RH |
| Surface Tack Free Time | 11–14 min | – |
| Depth of Cure (shadowed areas) | ~6 mm | – |
| Shore Hardness, Durometer A | – | ≥25 |
| Elongation at break, ISO 37, % | – | ≥135 |
| Tensile Strength, ISO 37, N/mm² (psi) | – | ≥1 (≥145) |
| Tear Strength, ISO 34-1, N/mm (lb/in) | – | ≥1.7 (≥9.7) |
| Coefficient of Thermal Expansion, K⁻¹ | – | 2.89×10⁻⁴ |
| Water Absorption, ISO 62, % | – | 0 |
| Shrinkage, % | – | 0 |
| Water Vapor Trans. Rate, ASTM E96, g/(h·m²) | – | 0.455 |
| Compression Set, ASTM D395, % | – | 6 @22°C; 44 @75°C; 80 @100°C |
| Dielectric Constant / Dissipation Factor | – | 100 Hz: 2.9 / 0.002; 100 kHz: 2.88 / 0.003 |
| Volume Resistivity, Ω·cm | – | 8.3×10¹³ |
| Lap Shear Strength, N/mm² (psi) | – | Al-Glass: 0.1–0.5 (15–70); Steel-Glass: 0.4–1.2 (60–175); Glass-Glass: 0.3–1 (40–145) |
Notes:
Functional strength develops almost instantly after UV exposure.
Full properties develop over 72 hours.
Moisture cure continues to strengthen shadowed areas.
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