DOWSIL EA2900

Harmonization Code : 2901.10.00.00 | Acyclic hydrocarbons; Saturated

DOWSIL EA2900

Main features

  • Fast Assembly-Strength Development
  • 400% Cured Elongation
  • 17.1 kV/mm Dielectric Strength

Product Description

DOWSIL EA-2900 Sealant White is a one-part, white, neutral alkoxy-cure RTV silicone adhesive for bonding and sealing PCB assemblies and optical parts in LED lamps and luminaires. The material extrudes at 190 g/min and reaches a typical tack-free state in 20 minutes at 23 deg C and 50% relative humidity. Aluminum lap-shear assembly strength increases from 4 kPa at 10 minutes to 100 kPa after one day, while full-property data apply after seven days under the same temperature and humidity. The cured elastomer provides 400% elongation, 17.1 kV/mm dielectric strength and UL 94 V-1 classification at 6 mm.

Key features

  • Fast assembly-strength development: Aluminum lap-shear strength is reported from 10 minutes through one day.
  • 400% cured elongation: The seven-day cured elastomer retains high extension capability.
  • Electrical insulation data: Typical dielectric strength is 17.1 kV/mm with 1.02E+14 ohm cm volume resistivity.

Applications

Bonding and sealing PCB system components and devices, and assembling optical parts in LED lamps and luminaires.

Product Family

DOWSIL EA2900

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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.
1.52
Physical Properties
Extrusion Rate
190 g/min
Tack-Free Time
20 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.
400 %
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.
17.1 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.
1.02 x 10¹⁴ Ohms⋅cm

Additional Information

Technical properties

As-supplied / before-processing properties

Typical as-supplied and early assembly values. Assembly strength is not full cure. Values are not specifications.

Property Value Unit Method / condition
Component count One As supplied
Color White As supplied
Extrusion rate 190 g/min As supplied
Specific gravity 1.52 g/ml As supplied
Tack-free time 20 minutes 23 deg C, 50% relative humidity
Assembly strength after 10 minutes 4 kPa Aluminum lap shear
Assembly strength after 60 minutes 10 kPa Aluminum lap shear
Assembly strength after 1 day 100 kPa Aluminum lap shear
Shelf life at 25 deg C 12 months Unopened storage
Technical properties

After-processing / final-state properties

Typical properties after seven days at 23 deg C and 50% relative humidity unless noted. Values are not specifications.

Property Value Unit Method / condition
Durometer hardness 50 Shore A Seven-day cure
Modulus at 100% elongation 1.2 MPa Seven-day cure
Tensile strength at break 2.1 MPa Seven-day cure
Elongation at break 400 % Seven-day cure
Unprimed lap shear to aluminum 1.5 MPa Substrate-specific
Unprimed lap shear to glass 1.6 MPa Substrate-specific
Unprimed lap shear to polycarbonate 1.5 MPa Substrate-specific
Unprimed lap shear to PMMA 1.5 MPa Substrate-specific
Dielectric strength 17.1 kV/mm Cured material
Volume resistivity 1.02E+14 ohm cm Cured material
UL flammability classification 94 V-1 At 6 mm

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