• Item Name: LOCTITE® SI 5240™
• Manufacturer: Henkel
• Technologies: Silicone
• Color: Clear liquid with yellow to green tint (slight haze permissible)
• 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 5240™ is a one-component, alkoxy silicone-based sealant that cures with ultraviolet (UV) and visible light, with a secondary moisture cure for shadowed areas. It forms a medium-strength, flexible rubber sealant with excellent flow characteristics, making it suitable for various industrial applications.
| Property | Value |
|---|---|
| Specific Gravity | 1.06 |
| Viscosity (Brookfield RVT, Spindle 5, 10 rpm) | 15,000 – 35,000 mPa·s (cP) |
| Appearance | Clear liquid with yellow to green tint |
| Condition | Time |
|---|---|
| UV Cure (Zeta® 7760, 225 mW/cm²) | 50 – 55 sec |
| UV Cure (Electrodeless, 500 mW/cm²) | 5 – 10 sec |
| Depth of Cure (70 mW/cm² @ 365 nm, 60 sec) | ≥10 mm |
| Property | Value |
|---|---|
| Shore Hardness (Durometer A) | ≥40 |
| Elongation at Break | 250 – 450% |
| Tensile Strength | ≥3 N/mm² (≥435 psi) |
| Tear Strength (ISO 34-1, Die C) | 12.6 N/mm (72 lb./in.) |
| Volume Resistivity | 1.2 × 10¹⁵ Ω·cm |
| Dielectric Breakdown Strength | 21 kV/mm |
| Aging Condition | Change in Properties |
|---|---|
| 85°C, 85% RH (168 hrs) | -84% Tensile Strength, -64% Elongation |
| 100°C (168 hrs) | +26% Tensile Strength, -26% Elongation |
| 150°C (168 hrs) | -47% Tensile Strength, -27% Elongation |
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