COOLTHERM 6756

Harmonization Code : 3910.00.00.90 | Silicones in Primary Forms; Others

COOLTHERM 6756

Main features

  • Adhesion-Promoting Surface Treatment
  • 1 cP Application Viscosity
  • Recommended 3 to 10 um Film Thickness

Product Description

Circalok™ 6756 Primer is a single-component, low-viscosity silicone adhesion promoter developed for electronics applications involving room-temperature-vulcanizing silicone rubbers. The clear or red liquid is applied to prepared metal or glass surfaces before the silicone material to support interfacial adhesion. It has a typical viscosity of 1 cP at 25 °C and a specific gravity of 0.77. Circalok 6756 may be applied by brush or spray, with a recommended primer-film thickness of 3–10 µm, followed by 60–90 minutes of air drying at 25 °C before silicone application.

Key features

  • Silicone adhesion promotion: Supports bonding of RTV silicone rubbers to most metals and glass in electronics applications.
  • Low-viscosity application: Provides a typical viscosity of 1 cP at 25 °C for brush or spray application.
  • Controlled primer layer: Uses a recommended film thickness of 3–10 µm with 60–90 minutes of air drying at 25 °C.

Applications / Suitable for

  • Priming metal surfaces before application of RTV silicone rubber
  • Priming glass surfaces before application of RTV silicone rubber
  • Electronics assemblies requiring silicone-to-substrate adhesion promotion

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Product Family

COOLTHERM 6756

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TDS, SDS & Technical Documents

Technical Specifications

General Properties
Appearance
Appearance at room temperature.
Clear or Red Liquid
Specific Gravity
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.
0.77
Physical Properties
Viscosity
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
1 mPa.s
Thermal Properties
Flash Point
The flashpoint of a solvent is the lowest possible temperature at which it can vaporize to form an ignitable vapor. Flashpoint is often confused with “autoignition temperature”, which is the temperature at which a solvent ignites without an ignition source.
10 °C

Additional Information

Technical properties

As-supplied / before-processing properties

Typical properties and application conditions for Circalok 6756 Primer before silicone application. Values are not intended for specification purposes.

Property Value Unit Method / condition
Product form Single-component liquid primer — Silicone adhesion promoter
Appearance Clear or red liquid — As supplied
Dynamic viscosity 1 cP At 25 °C; test method not stated
Specific gravity 0.77 — Test temperature and method not stated
Recommended primer-film thickness 3–10 µm Applied by brush or spray for optimum adhesion
Air-drying time 60–90 minutes At 25 °C before applying RTV silicone

 

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