Dow 3099 HVIC Compound

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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

Best Practices for Dow 3099 HVIC Compound

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Technical Data for Dow 3099 HVIC Compound

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Overview

Application Type
- Coating - Coat
- Pottant / Encapsulant - Pot, Encapsulant
1 Part or 2 Part
- 1 Part or 2 Part - 1 Part
Material Form
- Grease
Industry
- Electronics - Electrical insulators
Chemistry
- Silicone
Application Method
- Dispenser - Air-less spray equipment, Airless pumps
- Brush - Bristle brush, Cloth pad, Hand
- Spray
Cure Method
- None
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

Best Practices for Dow 3099 HVIC Compound

*See Terms of Use Below
1. 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.
2. 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.
3. 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.
Comparable Materials for Dow 3099 HVIC Compound

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Spec Engine^® Results
- Dowsil 3140 RTV Coating(Dow)
  One-part, translucent adhesive or coating with good flowability, good flame resistance, UL, IPC and Mil spec tested.
- Loctite SI 5040(Henkel)
  Resists weathering, moisture, ozone and retains its properties through severe environments. This product is typically used in applications up to 200°C. Used for potting, coating and sealing of various automotive, military and industrial components.
- Loctite SI 5140(Henkel)
  Self-leveling, one component moisture curing silicone. Non corrosive cure mechanism. Performs well where high temperature and good electrical properties under high humidity conditions are required. MIL-A-46146B
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