LOCTITE 5045
Harmonization Code : 3208.20.90 | Paints and varnishes that are dispersed or dissolved in a non aqueous medium
Main features
- Non-Slumping RTV Application
- Flexible Shock-Absorbing Silicone
- Strain-Relief Component Reinforcement
Product Description
LOCTITE SI 5045 is a translucent, non-slumping, one-component alkoxy RTV silicone paste for bonding, sealing, and coating components. It cures at room temperature through atmospheric moisture and requires no mixing. The paste format supports reinforcement and strain relief around delicate parts while limiting flow away from the applied area. The cured silicone combines low Shore A hardness, high elongation, and measured tensile and tear properties for a flexible final state. It resists weathering, moisture, and ozone and is used in industrial, military, and automotive assemblies within its stated application and temperature limits.
Key features
- Non-slumping RTV placement: The paste remains positioned for bonding, sealing, coating, and reinforcement around components.
- Flexible strain-relief material: A Shore A hardness of 25 and 500% elongation support a compliant cured silicone state.
- Environmental silicone resistance: The cured material is documented for weathering, moisture, and ozone exposure within its application scope.
Applications / Suitable for
- Bonding, sealing, and coating components
- Strain relief and reinforcement of delicate parts
- Industrial, military, and automotive component assemblies
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Chemistry Type
Alkoxy silicone
Color
Translucent paste
The color
Component System
One component
Describes the number of components that must be supplied, mixed, or activated before application or cure.
Solids
92 %
Specific Gravity
1.14
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.
Thermal Properties
Linear thermal expansion
3×10^-4 K -1
Thermal Conductivity
0.2 W/m.K
Thermal conductivity describes the ability of a material to conduct heat. It is required by power packages in order to dissipate heat and maintain stable electrical performance.
Thermal conductivity units are [W/(m K)] in the SI system and [Btu/(hr ft °F)] in the Imperial system.
Physical Properties
Extrusion Rate
40 g/min
Tack-Free Time
300 minutes
Viscosity
Paste 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
Chemical Properties
Water Absorption
0.01 %
Mechanical Properties
Elongation
500 %
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.
Peel Strength
13 N/mm
Electrical Properties
Dielectric Strength
18 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
4×10^15 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 | Translucent paste | - | Uncured |
| Chemical type | Alkoxy silicone | - | As supplied |
| Components | One component | - | No mixing required |
| Specific gravity | 1.14 | - | 23 deg C |
| Solids / non-volatile content | 92 | % | As supplied |
| Extrusion rate | 40 | g/min | 0.62 MPa for 15 s at 25 deg C, Semco cartridge |
| Cure mechanism | Room-temperature vulcanizing | - | Atmospheric-moisture cure |
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 | 5 | h | 23 deg C, 50% RH |
| Full performance development | 72 | h | Room-temperature moisture cure |
| Shore hardness | 25 | Shore A | ISO 868; cured 1 week at 23 deg C, 50% RH |
| Elongation at break | 500 | % | ISO 37; cured 1 week at 23 deg C, 50% RH |
| Tensile strength | 3 | N/mm^2 | ISO 37; cured 1 week at 23 deg C, 50% RH |
| Tear strength | 40 | N/mm | ISO 34-1, die B; cured 1 week at 23 deg C, 50% RH |
| Water absorption | 0.01 | % | ISO 62; 24 h in water at 23 deg C |
| Dielectric breakdown strength | 18 | kV/mm | IEC 60243-1; cured 1 week at 23 deg C, 50% RH |
