Dow 996 Varnish

Dow 996 Varnish Datasheet
  • Description for Dow 996 Varnish

    Excellent electrical properties, bond strength and moisture resistance; long service life; good drainage factor.

    *See Terms of Use Below

    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

    Overview
    • Application Type
    • 1 Part or 2 Part
      • 1 Part or 2 Part - 1 Part
    • Material Form
      • Liquid - Fluid
    • Industry
      • Transformers
      • Coils
      • Motors
    • Chemistry
      • Other - Xylene
    • Application Method
      • Dip
    • Cure Method
      • Solvent
    • Color
      • Blue - Clear blue
      • Clear / Transparent - Clear blue
    Specifications
    Cure Specs
    Cure Temperature (°C) 150
    Cure Time (min) 0.05
    Viscosity (cPs) 100 to 200 Test Method
    Bond Strength
    General Bond Strength (psi) Excellent
    Material Resistance
    Moisture/Humidity Resistance Moisture/humidity resistance
    Conductivity
    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
    Other Properties
    Flash Point (°F) 80.6
    % Solids (%) 49 Test Method
    Density (g/cm³) 0.001 to 0.001 Test Method
    Business Information
    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

    *See Terms of Use Below

    1. Application

      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.

    2. Curing

      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
Viscosity Temperature
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
Density Temperature
0.001 to 0.001 g/cm³ 25°C
% Solids Test Methods
% Solids Test Method
49 % After 3hrs at 135°C