DOWSIL EA4900

Harmonization Code : 8001.20 | Unwrought tin: Tin alloys

DOWSIL EA4900

Main features

  • 5-Minute Tack-Free Time
  • 25 kV/mm Dielectric Strength
  • UL 94 V-0 Classification

Product Description

DOWSIL EA-4900 White RTV Adhesive is a one-part, white alkoxy-cure RTV silicone adhesive for sealing equipment and modules on circuit boards. It requires no mixing, extrudes at a typical 2,131 g/min and becomes tack-free in 5 minutes at 25 deg C. Moisture cure proceeds at room temperature, with more than 90% of full physical properties generally developing within 24 to 72 hours for this adhesive class. The cured material combines 4.0 MPa tensile strength, 25 kV/mm dielectric strength, 0.7 W/(m K) thermal conductivity and UL 94 V-0 classification. Lap-shear values remain specific to aluminum and glass test substrates.

Key features

  • 5-minute tack-free time: Supports fast surface handling at 25 deg C.
  • Electrical insulation performance: Typical cured dielectric strength is 25 kV/mm and volume resistivity is 1.0E+16 ohm cm.
  • UL 94 V-0 classification: The exact product carries this flammability classification.

Applications

Sealing equipment and modules on circuit boards.

Product Family

DOWSIL EA4900

Loading pricing…
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.
1.70
Physical Properties
Extrusion Rate
2,131 g/min
Tack-Free Time
5 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.
31 %
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.
25 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.
1.0E+16 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.
0.7 W/m.K

Additional Information

Technical properties

As-supplied / before-processing properties

Typical as-supplied and surface-cure properties. 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
Extrusion rate 2131 g/min As supplied
Specific gravity 1.70 Uncured
Tack-free time 5 minutes At 25 deg C
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
Tensile strength 4.0 MPa Cured material
Elongation 31 % Cured material
Durometer hardness 80 Shore A Cured material
Unprimed lap shear to aluminum 1.6 MPa Substrate-specific
Unprimed lap shear to glass 0.4 MPa Substrate-specific
Dielectric strength 25 kV/mm Cured material
Volume resistivity 1.0E+16 ohm cm Cured material
Dielectric constant 3.71 At 100 kHz
Dissipation factor 0.0118 At 100 kHz
Thermal conductivity 0.7 W/(m K) Cured material
UL flammability classification 94 V-0 Exact product

Leading Brands Trust in Our Products and Services

Products that Perform| Knowledge that Serves| Service that Delivers