VF111 Water based varnish
Insulation varnish, class H, with the following main properties:
-Free from solvents and other dangerous or hazardous material
-Not flammable
-Very good water release to guarantee a perfect insulation
-Reducible by water, excellent tank stability, stabilizing additives not required
-Low backing temperature, lower then traditional solvent varnishes
-Good flexibility, high bond strength, very good compatibility with any type of magnet wire
-Good electrical properties, good chemical and oil resistance
-Thermal class: H
UL
File E171184-Project 95ME62447 CCN OBOR2 (component)
File E171185-Project 95ME62448 CCN OBJS2 (system)
Physical properties
Viscosity CPS at 25℃ 500-1000
Flash point (tag closed) not flammable
Color orange
pH 7.0-8.5
Cure 2-4 hours at 120℃-130℃ (metal temperature)
Thinner water
Application and cure
This product can be reduce by 10-30% of water when used to impregnate medium-big size devices; in case of small motors or transformers percentage of water may be increased. Piece preheating is not required. Dipping must be done at room temperature. Suggested time and metal temperature: 30-60’ at 80-100℃+ 1-3 hours at 120-130℃.
General Information
Product is very stable and does not require additives to control pH.
Possible evaporation of water should be replaced by water addition in order to keep constant viscosity.
Product may freeze at 0℃ and therefore should be stored at temperature higher than 0℃.
Frozen varnish can be re-liquefied without any change in quality.
Thermal class
Twisted pair （ASTM3251） 180℃
Helical coil （ASTM3145） 155℃
Bond strength （ASTMD2519－68）
Helical coil, double reversed dip, 2 hrs at 150℃
Test temperature ℃ 25℃ 100℃
Bond strength Kg 20 9
Electrical properties
Sample preparation and conditioning conform to ASTM standard. Initial cure 2 hrs at 150℃
Dielectric breakdown voltage（ASTM D115） (film thickness：40μm)
As made 4500V
After 24 hours immersion in water 4000V
After 96 hours at R.U. 96% 4250V
After 48 hours in transformers oil 4500V
After 168 hours in transformers oil 4500V
Volume resistivity （ASTM D257）
As made 1015Ω×cm
After 24 hours immersion in water 1013Ω×cm
Surface resistivity （ASTM D257）
As made 1013Ω
After 24 hours immersion in water 1011Ω
25℃ 100℃ 180℃
Dielectric constant （1Khz） 4.7 4.3 4.1
Dissipation factor （1Khz） 0.01 0.04 0.26
Chemical resistance
Water excellent
Salt water excellent
Acids (10% sulfuric acid) good
Alkali (10% sodium hydroxide) good
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