VF750E Baking insulation varnish
It has very good Electromechanical properties for general use with other main properties:
-low smell
-very good flexibility and bon strength
-excellent compatibility with any types of magnet wires, including those with high thermal class
-good acid and alkali resistance
-excellent electrical properties
- very good adhesion and abrasion resistance
UL
File E171184-Project 95ME62447 CCN OBOR2 (component)
File E171185-Project 95ME62448 CCN OBJS2 (system)
Physical properties VF750E1 VF750E2 VF750E3 VF750E4
Color clear orange clear orange
Viscosity F/4 at 25℃ 50''~70'' 50''~70'' 18''~25'' 18''~25''
Flash point (tag closed) >36℃ >36℃ >36℃ >36℃
Thinner D100/127 D100/127 D100/127 D100/127
Cure at 2~3 hours×100℃~120℃(metal temp.)
Thermal class
Twisted pair （ASTM3251） 180℃
Helical coil （ASTM3145） 180℃
Bond strength （ASTMD2519－68）
Helical coil, double reversed dip, 2 hrs at 150℃
Test temperature ℃ 25℃ 100℃
Bond strength Kg 15 4
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
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 1010Ω
25℃ 100℃ 180℃
Dielectric constant （1Khz） 1.8 2.0 2.5
Dissipation factor （1Khz） 0.005 0.02 0.15 | 
