DOWSIL EA9189H

Harmonization Code : 8001.20 | Unwrought tin: Tin alloys

DOWSIL EA9189H

Main features

  • 2-Minute Tack-Free Time
  • 28 kV/mm Dielectric Strength
  • Multi-Substrate Lap-Shear Data

Product Description

DOWSIL EA-9189 H White RTV Adhesive is a one-part, white alkoxy-cure RTV silicone adhesive for module assembly bonding. The ready-to-use material requires no mixing and reaches a typical tack-free state in 2 minutes at 25 deg C. It can be dispensed manually or with automated equipment and moisture-cures at room temperature, with mild heat below 60 deg C available to accelerate cure. The cured adhesive combines 3.9 MPa tensile strength, Shore A 80 hardness, 28 kV/mm dielectric strength and 0.88 W/(m K) thermal conductivity. Unprimed lap-shear values are 2.2 MPa on aluminum, 2.3 MPa on copper, 1.2 MPa on polycarbonate and 2.4 MPa on FR-4, and the exact product carries UL 94 V-0 classification.

Key features

  • 2-minute tack-free time: Provides rapid surface cure at 25 deg C.
  • Multi-substrate lap-shear data: Typical values are reported for aluminum, copper, polycarbonate and FR-4.
  • Electrical and thermal properties: Cured data include 28 kV/mm dielectric strength and 0.88 W/(m K) thermal conductivity.

Applications

Module assembly bonding and sealing where a one-part white RTV silicone adhesive is specified.

Product Family

DOWSIL EA9189H

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TDS, SDS & Technical Documents

Technical Specifications

General Properties
Color
The color
White
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.
1.68
Physical Properties
Tack-Free Time
2 minutes
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.
32 %
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.
28 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.
3.3E+15 Ohms⋅cm
Thermal Properties
Thermal Conductivity
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.
0.88 W/m.K

Additional Information

Technical properties

As-supplied / before-processing properties

Typical as-supplied and surface-cure characteristics. Tack-free time does not represent full cure. Values are not specifications.

Property Value Unit Method / condition
Component count One As supplied
Color White As supplied
Cure system Alkoxy moisture cure Room-temperature RTV
Tack-free time 2 minutes At 25 deg C
Application method Manual or automated dispensing Ready to use
Technical properties

After-processing / final-state properties

Typical cured properties. Lap-shear values are substrate-specific. Values are not specifications.

Property Value Unit Method / condition
Specific gravity 1.68 Cured
Tensile strength 3.9 MPa Cured material
Elongation 32 % Cured material
Durometer hardness 80 Shore A Cured material
Unprimed lap shear to aluminum 2.2 MPa Substrate-specific
Unprimed lap shear to copper 2.3 MPa Substrate-specific
Unprimed lap shear to polycarbonate 1.2 MPa Substrate-specific
Unprimed lap shear to FR-4 2.4 MPa Substrate-specific
Thermal conductivity 0.88 W/(m K) Cured material
Volume resistivity 3.3E+15 ohm cm Cured material
Dielectric strength 28 kV/mm Cured material
Dielectric constant 2.59 At 100 kHz
Dissipation factor 0.009 At 100 kHz
UL flammability classification 94 V-0 Exact product

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