LOCTITE 5056
Harmonization Code : 3810.10.00 | Soldering, brazing or welding powders and pastes consisting of metal and other materials
Main features
- Rapid UV Silicone Cure
- Low-Viscosity Potting and Coating
- Transparent Elastomeric Final State
Product Description
LOCTITE SI 5056 is a light-yellow, transparent, one-component alkoxy silicone adhesive for UV and visible-light curing in bonding, potting, coating, and sealing applications. The low-viscosity liquid cures to a tough, transparent silicone rubber for assemblies requiring a flexible, electrically insulating final material. Under the specified 365 nm exposure, the surface can become tack free within 30 seconds and cure to a depth of at least 4 mm in 60 seconds. Disposable medical-device assembly is included within the product-specific ISO 10993-based evaluation scope.
Key features
- Rapid light-cure processing: The surface becomes tack free within 30 seconds under the documented 365 nm exposure.
- Low-viscosity multi-function application: The liquid supports bonding, potting, coating, and sealing before light cure.
- Transparent elastomeric final state: The cured silicone combines transparency, Shore A hardness of 35 to 50, and elongation above 170%.
Applications / Suitable for
- Bonding, potting, coating, and sealing
- Disposable medical-device assembly within documented evaluation scope
- Light-accessible assemblies requiring transparent cured silicone
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Physical Properties
Mechanical Properties
Electrical Properties
Additional Information
As-supplied / before-processing properties
Typical values for the product before cure, application, or assembly.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Appearance | Light yellow, transparent liquid | - | Uncured |
| Chemical type | Alkoxy silicone | - | As supplied |
| Components | One component | - | No mixing required |
| Specific gravity | 0.98 | - | As supplied |
| Viscosity | 1,400 to 3,000 | mPa s | Brookfield RVT, spindle 3, 20 rpm, 25 deg C |
| Cure mechanism | UV / visible light | - | Light-initiated cure |
| Primary functions | Bonding, potting, coating, sealing | - | As supplied product positioning |
After-processing / final-state properties
Typical values for the cured or installed product under the listed conditions.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Tack-free time | <=30 | s | Zeta 7215, 70 mW/cm^2 measured at 365 nm |
| Depth of cure | >=4 | mm | 70 mW/cm^2 at 365 nm for 60 s, Zeta 7200 |
| Shore hardness | 35 to 50 | Shore A | ISO 868; cured 70 mW/cm^2 at 365 nm for 60 s |
| Elongation at break | >170 | % | ISO 527-3; cured 70 mW/cm^2 at 365 nm for 60 s |
| Tensile strength | >5.0 | N/mm^2 | ISO 527-3; cured 70 mW/cm^2 at 365 nm for 60 s |
| Dielectric breakdown strength | 22.8 | kV/mm | IEC 60243-1; light cured per listed condition plus 24 h at 22 deg C, 50% RH |
| Lap shear, UV-transmitting polycarbonate | 4 | N/mm^2 | Polycarbonate to polycarbonate; light cured 60 s per side plus 24 h at 22 deg C, 50% RH |
