Air-drying and baking insulating varnishes for electric motors, submersible pumps and transformers. It penetrates between the turns, bonds the wires firmly and protects them from moisture, heat and dirt.
Varnish series to choose by thermal class, curing method and application technique. We also produce custom formulations for specific strip-out requirements and special needs.
Based on synthetic resin; cures at room temperature without an oven. Practical and economical for repair shops and field work.
Based on isophthalic alkyd resin; cured in an oven according to the recommended curing schedule. For series production and windings that demand maximum durability.
Low-viscosity varnish for armature and rotor windings. Prevents wires from lifting in high-speed armatures and delays carbonization.
A glossy, durable top coat for electrical machines after varnishing. Air-drying; adds extra protection against moisture and corrosion.
Air-drying and baking insulating varnishes for low and medium voltage transformers, together with pole and insulating paints.
A hard, heat-resistant insulating coating for the outer surface of variacs. Colorless, transparent, sediment-free; does not skin over in the dip tank.
Class F air-drying insulating paint that coats and insulates windings, connections and terminals in a single step after rewinding. Practical for repairs, touch-ups and field work.
Winding Varnish StripperSoftens cured varnish and insulation residues before rewinding, making it easier to strip the winding and clean the slots.
Since 1988 we have been manufacturing insulating varnishes, paints and resins for electric motors and transformers. We produce to modern manufacturing and quality-control principles and develop custom formulations to meet each customer's needs.
Winding varnish is a solvent-based or solventless insulation system applied to the winding after it has been wound. The right varnish extends motor life and reduces failures and returns.
Fills the gaps between wires, increases dielectric strength and reduces the risk of short circuits.
Turns the winding into a single solid body; stops wires from moving or lifting under vibration and at high speed.
Forms a barrier against moisture, dust, oil, acids and alkalis; makes the difference in submersible pumps and harsh environments.
By filling air voids with varnish, it helps carry heat from the winding to the housing and reduces hot spots.
| Class | Max. temperature | Typical use |
|---|---|---|
| B | 130 °C | General-purpose small and medium motors |
| F | 155 °C | Industrial motors, pumps — the most common class |
| H | 180 °C | Heavy duty, high temperature, dry-type transformers |
Request the TDS for product-specific thermal class and technical data.
The winding must be clean, oil-free and dry. Preheat old motors to drive off moisture; a warm winding absorbs varnish better.
When dipping, leave the winding immersed until bubbles stop rising. With brush or spray, work the varnish well into the winding.
Let excess varnish drain off; pooled varnish lengthens drying time and leaves a thick, soft layer.
Observe the full drying time for air-drying products and the recommended temperature–time schedule for baking products.
Short, clear answers on choosing, thinning and applying winding varnish.
Choose the right varnish in 4 steps by thermal class, oven availability and motor type.
Read more → GuideWhich thinner for which varnish, what a 3:1 ratio means, and what too much thinner does.
Read more → GuideThe 6 most common causes, a symptom-based diagnosis table and how to rescue varnish that won't dry.
Read more → GuideThe difference between the two varnish types, when to choose each, and how to apply each correctly.
Read more →Winding varnish is a solvent-based or solventless insulating varnish applied to electric motor and transformer windings after winding, protecting them from electrical and external influences. It penetrates between the turns, bonds the wires together and insulates against moisture and contamination.
If you have no oven or do field/repair work, air-drying varnish (OR 1xx series) is practical; it cures at room temperature. For series production and when maximum bond strength, heat and moisture resistance are required, baking varnish (OR 3xx series) is preferred.
First determine the operating temperature of the motor and the class of the enameled wire. The varnish class must be at least equal to the winding class: class B 130 °C, class F 155 °C, class H 180 °C.
Depending on the product, by dipping, brush or spray gun. The winding must be clean and dry before application and preheated if necessary. For baking products, follow the recommended curing schedule.
For general use, add 1 part thinner to 3 parts varnish. Orchem air-drying varnishes are thinned with T-100, OKA-501 varnish with T-501 and baking varnishes with T-300 thinner. The wrong thinner can impair drying and insulation; check the product TDS for the exact ratio.
Yes. Write to us via WhatsApp or e-mail with your requirements and we will send the TDS and current price list for the relevant product.
Yes. We develop custom varnishes according to strip-out type, viscosity, drying time and your application line.
Tell us your motor type, operating temperature and application method, and we will promptly send you the suitable Orchem varnish, its TDS and price.