Varnishes
Products such as DOW CORNING® 994 VARNISH, when used to impregnate glass cloth, provide long-term flexibility and electrical insulation, even when exposed to temperatures of 250°C for 1 year.
The use of silicone electrical impregnating varnish and silicone resin facilitates heat transfer, minimizes vibration and provides moisture resistance. These features lead to increased part life, reliability, and lower total cost.
Impregnating Varnishes:
Dow Corning® 994 Varnish - Silicone electrical varnish
Designed for coating glass cloth, Also used for coating sleeving and for bonding mica-glass combinations.
- Silicone resin in xylene
- Heat and water resistant
- AIEE Class 220 C insulating material
- DOW CORNING 994 Varnish is the most heat stable varnish available. Glass cloth coated with this varnish retains its flexibility and electric strength after 1 year at 250°C
Dow Corning® 996 Varnish – General purpose impregnating varnish for motors, coils and transformers.
- Silicone resin in xylene
- Can be cured at temperatures as low as 150°C
- Proven reliability over a decade of extensive use
- Long service life even at 220°C hottest spot temperature
- Combines in one varnish, excellent electrical properties, bond strength and moisture resistance
- Good drainage factor (little varnish runoff during cure)
Dow Corning® 997 Varnish – UL Listed electrical varnish; silicone resin in a solvent; easy to use, good bond strength retention, moisture resistance
Used as an impregnate and coating material for various electrical coils – including transformers, motors and generators
- Long service life – reliable even at 220 C (428 F) hottest spot temperature
- Ease of use – varnish is readily thinned to meet specific application requirements
- Little tendency to bubble during cure
- Flexible cure schedules
- Designed to meet MIL-I-24092B