Frequently Asked Questions

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Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.
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As you know, all electrical machines run when electric current pass through its coil or winding. The electric current has two components; one component gives active power, which is being use for generating useful energy and other component gives reactive power, which generate heat in electric machines. The other component also called loss current. The electric machines run in very adverse environment of humidity, chemical vapor, temperature and vibration. As result of this adverse environment, three different kind of stress (Thermal, mechanical and chemical) work at a time on machine, which cause failure of machines. Insulating varnishes is specially formulated to protect the electrical machine from these stresses, so that life and safety of electrical machine is enhanced.
The solution of resin and solvent without pigment are called varnish.
Insulating varnishes are classified on the basis of drying nature and their thermal class. According to drying nature varnish is classified as air drying and baking type. According to thermal classes the varnishes are classified as A, B, C, E, F and H.
NEOVAR is used for applications in transformer, chokes, coils, all kinds of motor, fans, circuit board, insulation tapes, glass laminates, AC/ DC motor, generator, alternator, armature etc.
It is applied by dipping, pouring, brushing and vacuum impregnation.

The small component like small transformer, chokes etc can be applied by dipping thecomponent in varnish tank and hang for drying. The bigger component like motor, rotor, alternator etc can be applied by brushing/pouring. Some precision electrical machine orcoils, which runs on very high voltage like ignition coil, fly back transformer, are applied by vacuum impregnation.
In vacuum impregnation method, varnish is poured in One tank ( 1st tank). 1st tank is connected to 2nd tank. In second tank, electrical components are placed in tray. Vacuum is applied from 2nd tank. Due to applying of vacuum, varnish come to 2nd tank and impregnate the component kept in the tray. This is most precision method of impregnation. In this method varnish reach to every turns of coil and ensure component winding 100% free from air entrapment in coil. Air entrapment may be a cause for failure of components sometime.

 

Different grades of NEOVAR varnish with their drying nature, thermal class & major application.

 

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 thinners are added to varnish to improve penetration property of varnish, so that Neovar reach to every turn of coil. The quantity of thinner added as per permissible limit given in technical data sheet. Normally, with 1 part of varnish 1part of thinner added but the thinner quantity can be increased or decreased depending upon method of application.

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.

The maximum electrical voltage at which insulating material fails for insulation is called BDV. It is measured in terms of KV/mm.

 

Insulation resistance

The thermal class or temperature index is related to temperature resistance of insulating varnish. The thermal class is denoted by A, E, B, F, H and C. These letters correspond to particular temperature resistance A=1050C, E=1200C , B=1300C , F=1550C, H=1800C, C=2000C
The properties of material or substance, which retards the flow of current through it when voltage is applied across its terminal, are called electrical resistance. The electrical resistance measured in Ohm- cm.

 

electrical resistance

These are used for all building and structures in order to eliminate possible defects in surfaces or structures prepared as well as to enhance properties of such surfaces or structures.
Waterproofing Products / Insulation Coatings / Bonding Agents, Admixtures & plasticizers / Grouts / Curing Compound / Concrete Sealers / Crack filling compound / De Shuttering oil / Industrial Flooring / Micro Concrete / Floor hardener etc.
Neo specializes in waterproof coating & insulation coating based on liquid membrane technology.
These are seamless homogeneous ready to use superficial coating that are cold applied. They are elastomeric coating with great flexibility to withstand structural expansion contraction. These products do not crack and themselves serve as a crack bridging coating upto a limited hair line cracks. These products upon coating do not add load on to the surfaces unlike other cement based coating products.
Bonding agents are speciality polymers that enhance the bonding ability of one concrete surface to another.
They are of different types based on their polymer composition viz – Acrylic / SBR / PVA / Epoxy.
They are almost similar in all its features , benefits and applications. SBR bonding agent is preferred for Internal applications due to its poor UV resistance while Acrylic bonding agent is ideal for both external & internal applications. SBR has slightly more bond strength & flexibility compared to Acrylic.
All cement based structures tend to crack and also tend to give way to leakage / seepage due to irregularities in the formed structures. The same may be due to several reasons. Honeycombs , Capillaries present in concrete / cement surfaces give rise to leakage. To eliminate these defect IWA is added in the dosage of 200 ml per 50 kg bag of cement to take care of possible defects. These products also improves crack resistance of structure.
Heating, Ventilation & Airconditioning use Ducts for air circulation. To prevent transmission of heat from outside , the ducts are insulated with suitable insulating materials. Duct coating materials are used to bond the Insulating materials like PU foam / Fibre Glass Wool along with the duct. They are also coated over the insulting liner material to protect them from external moisture & maintain hygene.

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