VF750N/R Pigmented insulation varnish
Red & black varnish with these typical properties as follow:
-good flexibility
-good adhesive and abrasion resistance
-high hiding power
-excellent thermal and mechanical properties
-excellent electrical properties
-excellent compatibility with all types of magnet wires, including those with high thermal class
-good acid and alkali resistance
UL
File E171184-Project 95ME62447 CCN OBOR2 (component)
File E171185-Project 95ME62448 CCN OBJS2 (system)
Physical properties VF750R VF750N
Color red black
Viscosity F/4 at 25℃ 100''~150'' 50''~70''
Flash point (tag closed) 13℃ 13℃
Thinner D100 D100
Cure 2~3 hours×130℃~135℃ (metal temp.)
Thermal class
Twisted pair （ASTM3251） 155℃
Helical coil （ASTM3145） 200℃
Bond strength （ASTMD2519－68）
Helical coil, double reversed dip, 2 hrs at 150℃
Test temperature ℃ 25℃ 100℃
Bond strength Kg 18 5
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 2.1 2.7
Dissipation factor （1Khz） 0.006 0.02 0.16
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