COOLTHERM 6712
Harmonization Code : 3910.00.00.90 | Silicones in Primary Forms; Others
Main features
Product Description
Circalok™ 6712 is a two-component, low-viscosity, solvent-free silicone encapsulant that cures at room temperature to form an elastomeric, stress-relieving rubber with excellent electrical insulation and high-temperature performance. It is designed for potting and encapsulating densely packed electronic components and for producing flexible molds. The material offers a typical viscosity of 7,250 cP, continuous service temperatures from -55 to 205 °C, intermittent exposure up to 300 °C, and low linear shrinkage after cure.
Key Features
- Low-viscosity, solvent-free silicone for room-temperature curing and encapsulation of densely packed assemblies.
- Outstanding electrical insulation with high dielectric strength, high volume resistivity, and stable dielectric properties.
- Wide service temperature capability with continuous operation from -55 to 205 °C and intermittent exposure up to 300 °C.
Applications / Suitable for
- Potting electronic components
- Encapsulating densely packed electronic assemblies
- Manufacturing flexible molds
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Color
White
The color
Specific Gravity
1.16
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
Viscosity
7250 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
180 %
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.
Thermal Properties
Thermal Conductivity
0.7 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.
Electrical Properties
Dielectric Strength
0.5 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
10^14 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 uncured properties before catalyst addition and curing.
| Property | Value | Unit | Method / Condition |
|---|---|---|---|
| Product type | Two-component silicone | — | Solvent-free encapsulant |
| Specific gravity | 1.16 | — | 25 °C |
| Viscosity | 7,250 | cP | 25 °C |
| Standard color | White | — | Black also available |
| Shelf life | 6 | months | Closed containers from shipment date |
Technical Properties
After-Processing / Final-State Properties
Typical cured properties after catalyst addition and curing.
| Property | Value | Unit | Method / Condition |
|---|---|---|---|
| Tensile strength | 340 | psi | 25 °C |
| Elongation at yield | 180 | % | Typical |
| Hardness | 35 | Shore A | Typical |
| Linear shrinkage | 0.002 | in/in | Typical |
| Continuous service temperature | -55 to 205 | °C | Typical |
| Intermittent service temperature | -100 to 300 | °C | Typical |
| Thermal conductivity | 2.4 | BTU·in/ft²·hr·°F | Typical |
| Volume resistivity | 1 × 1014 | Ω·cm | 25 °C |
| Dielectric constant | 3.6 | — | 25 °C, 100 kHz |
| Dielectric strength | 500 | V/mil | Typical |
