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
Chemistry Type
Alkoxy silicone
Color
Light yellow, transparent liquid
The color
Component System
One component
Describes the number of components that must be supplied, mixed, or activated before application or cure.
Specific Gravity
0.98
Specific gravity (SG) is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume.
For liquids, the reference substance is almost always water (1), while for gases, it is air (1.18) at room temperature. Specific gravity is unitless.
Physical Properties
Depth of Cure
≥4 mm
Tack-Free Time
75 minutes
Viscosity
1,400 to 3,000 mPa.s
Viscosity is a measurement of a fluid’s resistance to flow.
Viscosity is commonly measured in centiPoise (cP). One cP is defined as
the viscosity of water and all other viscosities are derived from this base. MPa is another common unit with a 1:1 conversion to cP.
A product like honey would have a much higher viscosity -around 10,000 cPs-
compared to water. As a result, honey would flow much slower out of a tipped glass than
water would.
The viscosity of a material can be decreased with an increase in temperature in
order to better suit an application
Mechanical Properties
Elongation
>170 %
Elongation is the process of lengthening something.
It is a percentage that measures the initial, unstressed, length compared to the length of the material right before it breaks.
It is commonly referred to as Ultimate Elongation or Tensile Elongation at break.
Electrical Properties
Dielectric Strength
22.8 kV/mm
Dielectric strength is measured in kV per mm and is calculated by the Breakdown voltage divided by the thickness of the tested material.
Those two properties go hand in hand and while Breakdown voltage is always thickness dependent, dielectric strength is a general material property.
As an example, the dielectric strength of Polyimide is 236 kV/mm. If we place 1mm of Polyimide between two electrodes, it will act as an insulator until the voltage between the electrodes reaches 236 kV. At this point it will start acting as a good conductor, causing sparks, potential punctures and current flow.
Volume Resistivity
9.9×10^13 Ohms⋅cm
Volume resistivity, also called volume resistance, bulk resistance or bulk resistivity is a thickness dependent measurement of the resistivity of a material perpendicular to the plane of the surface.
Additional Information
Technical properties
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 |
Technical properties
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 |
