LOCTITE SI 5033
Harmonization Code : 3910.00.00.90 | Silicones in Primary Forms; Others
Main features
- Dual-Cure Sealing Processing
- Rapid Light Cure
- Thixotropic Application Control
Product Description
LOCTITE® SI 5033™ is a one-component, dual-cure acetoxy silicone sealant that combines rapid UV/visible light curing with secondary moisture curing for shadowed areas. The non-sag, thixotropic formulation develops functional strength almost instantly upon light exposure and continues to build performance over 72 hours under ambient conditions. Designed for encapsulating, bonding, gasketing, and sealing applications, it forms a high-strength flexible silicone rubber with deep cure capability and excellent environmental resistance.
Key Features & Benefits
- Dual-cure silicone technology (UV/visible light plus moisture cure).
- Rapid light cure with deep cure capability.
- Secondary moisture cure for shadowed areas.
- Non-sag, thixotropic formulation minimizes migration.
- Positive UV fluorescence for inspection.
- Suitable for bonding, encapsulating, sealing and gasketing.
- Produces a tough, flexible silicone rubber.
Recommended Applications
- Electronic encapsulation.
- Gasketing and sealing assemblies.
- Glass-to-metal bonding.
- Plastic component bonding.
- Applications requiring deep UV cure and shadow curing.
TDS, SDS & Technical Documents
Technical Specifications
General Properties
AppearanceAppearance
Light yellow, translucent pasteSpecific GravitySpecific Gravity
1.09Additional Information
Technical Properties
As-Supplied / Before-Processing Properties
| Property | Value | Unit | Condition |
|---|---|---|---|
| Technology | Silicone | — | Dual-cure UV/moisture system |
| Chemical Type | Acetoxy Dual-Cure Silicone | — | One-component formulation |
| Appearance | Light Yellow, Translucent Paste | — | Uncured material |
| Fluorescence | Positive Under UV Light | — | Inspection aid |
| Specific Gravity | 1.09 | — | 25°C |
| Solids Content | 95.7 | % | Non-volatile content |
| Aspect Ratio (60 sec) | 1.0 | Height/Width | Thixotropic behavior |
| Extrusion Rate | 100 - 170 | g/min | 0.6 MPa, 25°C |
| Skin Over Time | ≤15 | minutes | 23°C |
| Tack-Free Time | ≤20 | seconds | 70 mW/cm² @ 365 nm |
Technical Properties
After-Processing / Final-State Properties
| Property | Value | Unit | Condition / Method |
|---|---|---|---|
| Depth of Cure | ≥10 | mm | 60 sec @ 70 mW/cm², 365 nm |
| Shore Hardness | 45 - 65 | Shore A | ISO 868 |
| Tensile Strength | ≥2.75 | N/mm² | ISO 37 |
| Elongation at Break | ≥150 | % | ISO 37 |
| Tear Strength | 14.0 | N/mm | ISO 34-1 Die C |
| Compression Set | 4.8 | % | 22°C, 70 h |
| Volume Resistivity | 1.1 × 10¹⁵ | Ω·cm | IEC 60093 |
| Dielectric Breakdown Strength | 16.2 | kV/mm | IEC 60243-1 |
| Lap Shear Strength (Glass to Glass) | 2.9 | N/mm² | ISO 4587 |
| Lap Shear Strength (PVC to Glass) | 4.1 | N/mm² | ISO 4587 |
