|GRADE||NATURE OF DRYING||THERMAL CLASS||TYPICAL APPLICATION|
|B 301||Air Drying||B||Transformer tank, radiator, water pump , stator etc|
|AD 401 / AD 403||Air Drying||B||Motor, alternator, generator, fans, transformer chokes, circuit board etc|
|B 302||Air Drying||B||Medium to low voltage stator, motor, fans, field coil , transformer, pump etc|
|NEOPOXY RESIN 901 & NEOPOXY HARDENER 91||Two Part Air Drying||B||Used as finishing varnish over exposed winding of electrical machine up to class B to improve moisture & chemical resistance|
|F 502||Air Drying||F||All types of impregnating winding where extra protection is required like insulating board|
|F 501||Baking||F||All kinds of motor, alternator, AC induction motor, transformer, fans, chokes which run in adverseEnvironment|
|B 303||Baking||B||High voltage motor, transformer etc|
|NEOVAR Red / Grey||Air Drying||B||All kinds of motors, alternators, generators, fans, and transformers and chokes as finishing varnish.|
The insulating varnishes are chosen as per following method
a) First identify the thermal class of electrical machine on which varnish to be applied from customer.
b) Choose a varnish whose thermal class is matching to that of electrical machine but not less than of machine class.
c) If you have baking facility then choose baking type varnish or else stick to air drying varnish
What do you mean by Flexibility of varnish
It is defined as property of varnish film and it’s determined by resistance to crack when copper wire specimen coated with varnish has been bent for 180 degree around the mandrel.
What is Volume resistivity
This is defined as resistance of material to leakage of electric current through its body. It is measured as Ohm –cm.
What is Dissipation factor
It is a measure of electrical losses and significantly it should be minimum as possible for efficient performance of insulating material.
What is Dielectric constant
It is ability of insulator to store the energy and hence high dielectric constant is desired
What is Flash point
It is property of material and defined as the minimum temperature at which material would catch fire when vapor pressure of and atmospheric pressure attains equilibrium.
What does Dilution Ability & Compatibility signify
It denotes the percentages in volume of thinner that can be added before the first turbidity appear.
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