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Description for Dow 3099 HVIC Compound
Non-tracking; arc and flashover resistant; good adhesion; easy to use grease like silicone coating.Application Type Coat, Pot, Encapsulant 1 Part or 2 Part 1-Part Material Form Grease Industry Electrical insulators Manufacturer Dow Chemistry Silicone Color Gray, Opaque Arc Resistance (sec) Arc Other Resistance Flashover, Non-tracking Volume Resistivity (O) 1.46e13 (ohms/cm) -
Technical Data for Dow 3099 HVIC Compound
Overview
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Application Type
- Coating - Coat
- Pottant / Encapsulant - Pot, Encapsulant
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1 Part or 2 Part
- 1-Part
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Material Form
- Grease
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Industry
- Electronics - Electrical insulators
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Chemistry
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Application Method
- Dispenser - Air-less spray equipment, Airless pumps
- Brush - Bristle brush, Cloth pad, Hand
- Spray
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Cure Method
- None
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Color
- Gray
- Other - Opaque
Specifications
Bond Strength
General Bond Strength (psi) Good Material Resistance
Arc Resistance (sec) Arc Other Resistance Flashover, Non-tracking Conductivity
Dissipation Factor 0.01480, 0.00660 Test Method Dielectric Strength (V/mil) 285 Test Method Dielectric Constant 3.88, 3.86 Test Method Volume Resistivity (O) 1.46e13 (ohms/cm) Test Method Other Properties
Specific Gravity 1.300 Test Method Flash Point (°F) 249.8 Test Method % Solids (%) 100 Test Method Business Information
Shelf Life Details DOW CORNING 3099 HVIC Compound has a shelf life of 60 months from date of manufacture Shelf Life Type from date of manufacture Shelf Life (mon) 60 -
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Best Practices for Dow 3099 HVIC Compound
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Surface Preparation
First clean the insulator surface. Traces of organics or cleaning detergents must be removed. It is particularly important that the insulator surfaces be dry before applying to insure the best results.
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Application
Apply DOW CORNING 3099 Compound to the insulator surface by hand, cloth pad, or with a bristle brush. Start with the top insulator, treating the stack. On fog-type insulators, take care not to overfill between the underside skirts as this shortens the leakage distance and subjects the insulator to an unnecessarily high voltage stress. The consistency of DOW CORNING 3099 HVIC Compound is such that normal hand application will result in a coating thickness of between 1/16- inch and 1/8-inch. A coating thickness of between 1/16-inch and 1/8-inch can also be obtained by spraying DOW CORNING 3099 HVIC Compound. This is ideal for all but the most severely contaminated conditions where the coating thickness should be 1/8-inch. It is important to apply a smooth, complete coating of DOW CORNING 3099 HVIC Compound. Its grey, opaque nature aids the user in doing this since he can see where it has been applied. DOW CORNING 3099 HVIC Compound can be applied with air-less spray equipment if diluted with an appropriate solvent to the desired viscosity. Handle solvents per manufacturer’s recommendations for safety and in accordance with local, state, and federal regulations. A dilution ration of approximately 70 percent compound and 30 percent solvent is recommended as a starting point. Mix thoroughly to ensure a consistent and even application rate. Properly diluted DOW CORNING 3099 HVIC Compound can be sprayed with Alemite models 7877,7827, and 707-B
Gray Company model 225-877
Lincoln Engineering model 83492 Airless pumps and Aro-model 650-044 pump. Other pump manufacturers supply airless spray equipment, which should perform satisfactorily if the compression ration is at least 26:1. The air pressure to the pump will vary with the orifice size on the nozzle. Nozzles with orifices from 0.013 to 0.026 inch diameter with fan width angles from 10 to 50 degrees may be used, depending on the size and shape of the insulators to be coated. The larger orifice nozzles require 40 to 60 psi, while the smaller ones require 60 to 80 psi.
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Removal
DOW CORNING 3099 HVIC Compound shows little change in consistency under field conditions and remains soft even though contaminated with large quantities of dirt particles. If can be removed without heat or excessive force. Just wipe the insulators with coarse textured rags or paper towels. The surface is then ready for a new coat.
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Dielectric Constant Test Methods
Dielectric Constant | Test Method |
---|---|
3.88 | ASTM D 150, 100 Hz |
3.86 | ASTM D 150, 1000 Hz |
Dielectric Strength Test Methods
Dielectric Strength | Test Method |
---|---|
285 V/mil | ASTM D 149, 50 mil thick |
Dissipation Factor Test Methods
Dissipation Factor | Test Method |
---|---|
0.01480 | ASTM D 150, 100 Hz |
0.00660 | ASTM D 150, 1000 Hz |
Volume Resistivity Test Methods
Volume Resistivity | Test Method |
---|---|
1.46e13 (ohms/cm) | ASTM D 149 |
Flash Point Test Methods
Flash Point | Test Method |
---|---|
121.0°C | CTM 0006 |
% Solids Test Methods
% Solids | Test Method |
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100 % | CTM 0208, Solids, g/1/C |
Specific Gravity Test Methods
Specific Gravity | Temperature | Test Method |
---|---|---|
1.300 | 25°C | CTM 0001A |