DOWSIL EA-9189 H
Harmonization Code : 3208.20.90 | Paints and varnishes that are dispersed or dissolved in a non aqueous medium
Main features
- One-Part No-Mix Bonding
- Tack-Free Time at 25 deg C
- UL 94 V-0 Classification
Product Description
DOWSIL™ EA-9189 H White RTV Adhesive is a one-part, moisture-curing silicone adhesive for module assembly applications. The alkoxy-cure RTV formulation requires no mixing and develops a tack-free surface in approximately 2 minutes at 25°C, supporting short handling intervals during assembly. After cure, the white adhesive combines a Shore A hardness of 80 with documented adhesion to aluminum, copper, polycarbonate, and FR-4 test substrates. It also provides thermal conductivity of 0.88 W/m·K, high volume resistivity, dielectric strength of 28 kV/mm, and a UL 94 V-0 flammability classification for electronics assembly applications requiring mechanical attachment, electrical insulation, and flame-rated material performance.
Key features
- One-part moisture cure: The ready-to-use alkoxy-cure formulation requires no component mixing and cures at room temperature.
- Fast tack-free time: Forms a tack-free surface in approximately 2 minutes at 25°C.
- Electrical and flame performance: Provides 3.3 × 1015 ohm·cm volume resistivity, 28 kV/mm dielectric strength, and a UL 94 V-0 classification after cure.
Applications / Suitable for
- Module assembly
- Battery-pack assemblies
- Electronic boards, components, and housings
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Color
White
The color
Specific Gravity
1.68
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
Tack-Free Time
2 minutes
Mechanical Properties
Elongation
32 %
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
0.88 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.
UL 94 Rating
94 V-0
Flammability rating classification.
It determines how fast a material burns or extinguishes once it is ignited.
HB: slow burning on a horizontal specimen; burning rate less than 76 mm/min for thickness less than 3 mm or burning stops before 100 mm
V-2: burning stops within 30 seconds on a vertical specimen; drips of flaming particles are allowed.
V-1: burning stops within 30 seconds on a vertical specimen; drips of particles allowed as long as they are not inflamed.
V-0: burning stops within 10 seconds on a vertical specimen; drips of particles allowed as long as they are not inflamed.
5VB: burning stops within 60 seconds on a vertical specimen; no drips allowed; plaque specimens may develop a hole.
5VA: burning stops within 60 seconds on a vertical specimen; no drips allowed; plaque specimens may not develop a hole
Electrical Properties
Dielectric Strength
28 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
3.3E15 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
Representative product characteristics before cure.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Component count | One-part | — | As supplied |
| Physical form | Paste | — | As supplied |
| Color | White | — | Visual |
| Cure system | Alkoxy moisture cure | — | Room-temperature cure |
| Tack-free time | 2 | minutes | 25°C |
After-processing / final-state properties
Typical cured-material properties. Values are not intended for use as product specifications.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Specific gravity | 1.68 | — | Cured material |
| Tensile strength | 3.9 | MPa | Equivalent to 576 psi |
| Elongation | 32 | % | Cured material |
| Hardness | 80 | Shore A | Durometer |
| Thermal conductivity | 0.88 | W/m·K | Cured material |
| Volume resistivity | 3.3 × 1015 | ohm·cm | Cured material |
| Dielectric strength | 28 | kV/mm | Equivalent to 700 V/mil |
| Flammability classification | UL 94 V-0 | — | Cured material |
