Application Type Bond 1 Part or 2 Part 1 Part Material Form Fluid Industry Transformers, Coils, Motors Manufacturer Dow Chemistry Xylene Cure Method Solvent Cure Temperature (°C) 150 Cure Time (min) 0.05 Viscosity (cPs) 100 to 200 Color Clear blue, Clear blue Density (g/cm³) 0.001 to 0.001
Technical Data for Dow 996 Varnish
- Adhesive - Bond
1 Part or 2 Part
- 1 Part or 2 Part - 1 Part
- Liquid - Fluid
- Other - Xylene
- Blue - Clear blue
- Clear / Transparent - Clear blue
Cure Temperature (°C) 150 Cure Time (min) 0.05 Viscosity (cPs) 100 to 200 Test Method
General Bond Strength (psi) Excellent
Moisture/Humidity Resistance Moisture/humidity resistance
Dissipation Factor 0.008 (100 Hz), 0.02 (100 Hz), 0.005 (100 kHz), 0.01 (100 kHz) Test Method Dielectric Strength (V/mil) 64 (kV/mm), 40 (kV/mm) Test Method Surface Resistivity (O) 10, 1e12 (ohm) Test Method Volume Resistivity (O) 1e¹¤ (ohms/cm) Test Method
Flash Point (°F) 80.6 % Solids (%) 49 Test Method Density (g/cm³) 0.001 to 0.001 Test Method
Shelf Life Details When stored at or below 25°C in the original unopened containers, this product has a usable life of 24 months from the date of production. Shelf Life Type From the date of production Shelf Life (mon) 24
Best Practices for Dow 996 Varnish
Electrical equipment should be kept clean at every step of insulation to prevent contamination of the impregnating varnish. After the equipment has been insulated but before it is dipped in OW CORNING 996 Varnish, it should be prebaked at between 150°C and 200°C to drive out moisture and to cure new insulating components.
After prebaking, the equipment should be allowed to cool to 80°C or below. It should then be dipped in this product for 5 to 10 minutes (or until most of the bubbling stops). Immersion time should not be longer than 10 minutes.
The first coat of varnish must be air dried, partially cured, and then cooled to room temperature before any further impregnation. Two dips will usually give sufficient buildup of varnish.
The curing time and temperature will vary with the size and complexity of the impregnated unit, the properties desired in the varnish film, and the characteristics of the circulating air curing oven. although it is not necessary to begin the cure in a preheated oven, curing time should be measured from the time both the oven and the impregnated equipment reach the curing temperature. The following general rules should be kept in mind when establishing curing schedules for specific equipment: The final cure temperature should be 20°C to 30°C above the maximum operating temperature of the impregnated equipment. Equipment intended for AIEE Class 180°C service should be cured at 200°C
if intended for AIEE Class 220°C service, it should be cured at 250°C.
When maximum bond strength is required, equipment should be given a final cure at 250°C for at least 6 hours.
Immersion time of electrical equipment in this product must be kept to a minimum to prevent solvent damage to the insulating components.
Comparable Materials for Dow 996 Varnish
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Viscosity Test Methods
|100 to 200 cPs||25°C|
Dielectric Strength Test Methods
|Dielectric Strength||Temperature||Test Method|
|64 (kV/mm)||150°C||Cured 16 hours at 150°C, 50mm electrodes|
|40 (kV/mm)||After immersion in distilled water for 24 hours, Tested on aluminium panels because copper oxidizes too rapidly.|
Dissipation Factor Test Methods
|Dissipation Factor||Temperature||Test Method|
|0.008 (100 Hz)||25°C||Cured 16 hours at 150°C|
|0.02 (100 Hz)||25°C||After immersion in distilled water for 24 hours|
|0.005 (100 kHz)||25°C||Cured 16 hours at 150°C|
|0.01 (100 kHz)||25°C||After immersion in distilled water for 24 hours|
Surface Resistivity Test Methods
|Surface Resistivity||Temperature||Test Method|
|10 O||150°C||Cured 16 hours at 150°C|
|1e12 (ohm)||23°C||After 96 hours at 23°C and 96% relative humidity|
Volume Resistivity Test Methods
|Volume Resistivity||Test Method|
|1e¹¤ (ohms/cm)||Cured 16 hours at 150°C, After 96 hours at 23°C and 96% relative humidity|
Density Test Methods
|0.001 to 0.001 g/cm³||25°C|
% Solids Test Methods
|% Solids||Test Method|
|49 %||After 3hrs at 135°C|