VF970RW Baking insulation varnish
Excellent adhesion strength and chemical drug resistance, it can be recommended to be used in moisture environment electrical instruments. It has following main properties:
UL
File E171184-Project 95ME62447 CCN OBOR2 (component)
File E171185-Project 95ME62448 CCN OBJS2 (system)
Physical properties VF970 VF970A
Color Clear Clear
Viscosity F/4 at 25℃ 70''~100'' 18''~25''
Flash point (tag closed) 29℃ 29℃
Thinner D133 D133
Cure 2~4 hours×130℃~150℃ (metal temp.)
Thermal class
Twisted pair （ASTM3251） 180℃
Helical coil （ASTM3145） 200℃
Bond strength （ASTMD2519－68）
Helical coil, double reversed dip, 2 hrs at 150℃
Test temperature ℃ 25℃ 100℃
Bond strength Kg 30 15
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 4800V
After 24 hours immersion in water 4600V
Volume resistivity （ASTM D257）
As made 1015Ω×cm
After 24 hours immersion in water 1013Ω×cm
Surface resistivity （ASTM D257）
As made 1012Ω
After 24 hours immersion in water 1011Ω
25℃ 100℃ 180℃
Dielectric constant （1Khz） 3.8 2.3 1.9
Dissipation factor （1Khz） 0.008 0.02 0.01
Freon Extraction 0.16% | 
