DOWSIL CC-2588

Harmonization Code : 8001.20 | Unwrought tin: Tin alloys

DOWSIL CC-2588

Main features

  • Five-Minute Tack-Free Processing
  • 22.3 kV/mm Dielectric Strength
  • Firm Abrasion-Resistant Cure

Product Description

DOWSIL CC-2588 Conformal Coating applies as a one-part, transparent, medium-viscosity silicone resin coating for rigid and flexible circuit boards. The colorless-to-pale-yellow liquid has a typical Brookfield viscosity of 930 cP, 88% nonvolatile content and a five-minute tack-free time at 25 deg C and 50% relative humidity. After cure, it forms a firm, abrasion-resistant surface with Shore A 75 hardness, 22.3 kV/mm dielectric strength and 5.04 MPa tensile strength. Spray, brush, flow, dip and automated pattern coating are supported, with solvent flash-off and cure conditions controlled for the applied film thickness.

Key features

  • Five-minute tack-free time: Supports rapid room-temperature handling at 25 deg C and 50% relative humidity.
  • High-solids application: Typical nonvolatile content is 88%.
  • Firm dielectric coating: Cured hardness is Shore A 75 with 22.3 kV/mm dielectric strength.

Applications

Protective conformal coating of rigid and flexible circuit boards and printed wiring boards.

Product Family

DOWSIL CC-2588

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TDS, SDS & Technical Documents

Technical Specifications

General Properties
Color
The color
Colorless to pale yellow 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.
1.06 / 1.11
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
930 mPa.s
Mechanical Properties
Elongation
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.
233 %
Electrical Properties
Dielectric Strength
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.
22.3 kV/mm
Volume Resistivity
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.
2.4E15 Ohms⋅cm

Additional Information

Technical properties

As-supplied / before-processing properties

Typical as-supplied and process properties. Values are not specifications.

Property Value Unit Method / condition
Component count One-part As supplied
Color Colorless to pale yellow liquid CTM0176
Viscosity 930 cP CTM0050; Brookfield LV, spindle #2 at 10 rpm
Specific gravity 1.06 Uncured; CTM0097
Tack-free time 5 min At 25 deg C and 50% RH; CTM0098
Nonvolatile content 88 % CTM0208; forced-draft volatility
Typical cure schedule 10 min RT + 10 min at 60 deg C 3 mil (75 um) coating after solvent flash-off
Technical properties

After-processing / final-state properties

Typical cured coating properties. Values are not specifications.

Property Value Unit Method / condition
Specific gravity 1.11 Cured; CTM0540
Durometer hardness 75 Shore A CTM0099
Dielectric strength 22.3 kV/mm CTM0114
Tensile strength 5.04 MPa CTM0137A
Elongation 233 % CTM0137A
Volume resistivity 2.4E15 ohm cm CTM0249
Glass transition temperature -117 deg C DMA
Coefficient of thermal expansion 180 ppm CTM0563

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