DOWSIL EA4900
Harmonization Code : 8001.20 | Unwrought tin: Tin alloys
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.
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Physical Properties
Mechanical Properties
Electrical Properties
Thermal Properties
Additional Information
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 |
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 |
