50 Micron Polyimide Film – Manufacturer, Supplier & Exporter in India
Not all insulation projects fit into the extremes. Some will need some thickness that cannot be provided by the ultra-thin wrap, yet cannot afford the additional bulk provided by a heavy gauge. That’s why 50 Micron Polyimide Film is specially designed for projects that lie between the two — a mid-thickness film (1.97 mil) which offers an added dielectric and mechanical strength to the design when compared to thin films, yet not as hard to handle as the heavy gauge films in our product range.
50 Micron Polyimide Film is amongst the most versatile polyimides we manufacture, hence the vast array of applications in which this product finds utility – from insulation of motor slots and transformer barrier layers, to capacitors dielectrics and rigid-flex substrate. Harnawa Insulations manufacturers, supplies and exports 50 Micron Polyimide Film to customers worldwide including India, and every roll produced has the same dielectric and thickness characteristics every time.
Technical Specifications
| Property | Specification |
|---|
| Product | 50 Micron Polyimide Film |
| Thickness | 50 microns (≈ 1.97 mil) |
| Appearance | Amber / golden translucent |
| Base Polymer | Aromatic Polyimide (PI) |
| Continuous Operating Range | -269°C to 400°C+ |
| Thermal Class | Class H (180°C) and above |
| Dielectric Strength | High — sits between our thin and heavy-gauge films |
| Mechanical Behaviour | Good tensile strength with retained flexibility |
| Chemical Resistance | Resists most industrial solvents, oils, acids and varnishes |
| Flame Behaviour | Self-extinguishing, low smoke |
| Supply Format | Rolls, slit rolls, cut sheets, custom widths |
| Standard Colour | Amber (natural polyimide colour, unpigmented) |
Where 50 Micron Sits in Our Polyimide Range
To help you pick the right gauge quickly, here’s how 50 Micron Polyimide Film compares against our other standard thicknesses:
| Grade | Best Suited For | Trade-off |
|---|
| 1 Mil / 25 Micron | Flexible circuits, tight coil wraps, lightweight FPC layers | Lower mechanical bulk, less dielectric margin |
| 50 Micron (this film) | Motor slot liners, transformer barriers, capacitor dielectrics, rigid-flex substrates | Balanced strength, flexibility and dielectric performance |
| 125 Micron | High-voltage ground wall insulation, structural barrier layers | Higher rigidity, best for load-bearing insulation |
Where an application falls within two categories of duty, such as a slot liner which must also flex while winding, 50 micron is usually the most practical choice until a thicker film is required.
Key Properties & Performance
Dielectric strength proportional to thickness The higher gauge of the film, from 25 to 50 microns, leads to higher insulation resistance and voltage breakdown margin, thus providing 50 Micron Polyimide Film significantly better high-voltage performance compared to thinner films, but being significantly more flexible than the 125 micron film.
Thermal stability even at extreme temperatures The film operates well from cryogenic conditions to operation above 180°С constantly and up to 400°С temporarily – which is an inherent property of the polyimide polymer material that does not depend on the film gauge.
Mechanical resistance to multiple stress The film demonstrates better tear resistance during die cutting, punching and winding operations compared to ultra-thin films and can flex without breaking around the motor slot and coil former even at 50 microns of gauge.
Chemical resistance to various substances The film is resistant to varnishes, impregnation resins, cleaning agents and most of the oils used in manufacturing of the motor and transformer – which means that the film will keep its insulating properties all through the manufacturing process, not only at its installation.
Dimensional stability in case of heat cycling Repeated heating and cooling cycles, that occur in motors, transformers and electric vehicles drivetrain do not distort and do not affect electrical properties of the film.
Applications
- Slot lining and phase insulation in motors and generators
- Groundwall and interlaminar insulation in transformers and windings
- Dielectric insulation layers in capacitors that need to be in between medium thicknesses
- Flexible and rigid flex printed circuit board substrates
- Insulating barrier in bus bars, terminal boards, and switchgear
- High temperature masking tapes and process tapes
- Insulation in electric vehicle battery packs and motor windings
- Insulating material in heaters and sensors in industry
For total winding insulation, 50 Micron Polyimide Film is usually used along with our Laminated Insulation Paper Composites (NMN and AHA laminates) for additional dielectric protection, and fixed in position using our Insulation Tapes High Temperature range.
Industries We Serve
- Electric Motor and Generator Manufacturing
- Power Transformer and Distribution Transformer Manufacturing
- Capacitor Manufacturing
- Electric Vehicles (EVs) Manufacturing
- Switchgear and Busbar Insulation
- Consumer Electronics and Flexible PCB Manufacturing
- Industrial Heating Equipment Manufacturing
- Aerospace and Defense Electrical Systems
Most of our clients in these industry sectors purchase Aramid Papers for increased thickness winding insulation, Fiberglass Insulated Cables for conductor insulation, and Fiberglass Insulation Sleeves for lead wire and terminal insulation protection as part of an insulation system. Please visit our Industries page for a full description of the industries we serve.
Why Source 50 Micron Polyimide Film from Harnawa Insulations
- Manufacturing & Not Just Trading – We manage the film manufacturing process ourselves and this ensures quality control of thickness tolerance, dielectric properties and supply consistency on each order.
- Domestic & International Shipping – No matter whether we should deliver your order domestically or abroad, our logistic system is equipped to serve such needs.
- Certified Internationally – The manufacturing process and the products themselves are certified by ISO 9001:2015, UL, CE, RoHS and REACH.
- Slitting & Sheet Services – Available in widths and lengths to match your winding, converting and die cutting machine specifications.
- Application Engineering Services – Uncertain whether 50 micron is the best choice for your application in comparison to 25 or 125 microns? Our technical team will review your voltage rating, mechanical duty and thermal requirements prior to placing your order.
- Pricing Structure – Direct manufacturer pricing system designed for small and bulk quantity.
Frequently Asked Questions (FAQs)
1. In what ways does 50 Micron Polyimide Film differ from the other 25 Micron and 125 Micron grades?
Being between the two, 50 Micron Film has enhanced mechanical and dielectric properties in comparison with 25 Micron Polyimide Film and is less stiff and harder to wrap than 125 Micron Polyimide Film.
2. Can you use 50 Micron Polyimide Film as motor slot insulation?
Yes, it is the most frequently used thickness of polyimide film for insulation of slot liners and phases in electric machines.
3. What is the highest temperature at which this film operates?
This material, like all our grades of polyimide film, has excellent electrical characteristics over wide range of temperatures from cryogenic down to 400 degrees Celsius and above for short periods. The film is rated for continuous operation in insulation systems of classes H (180 degrees Celsius) and above.
4. Is 50 Micron Polyimide Film applicable for use in transformer insulation systems?
Yes, it is widely used as insulation material for interlayers and ground walls in transformers and coils, being used with Laminated Insulation Paper Composites for dielectric reinforcement of windings.
5. Does Harnawa Insulations manufacture 50 Micron Polyimide Film or do they trade it?
No, Harnawa Insulations manufactures this film, supplying and exporting directly, and do not work as traders passing through the goods.
6. Can you supply 50 Micron Polyimide Film in custom widths/roll lengths?
Yes, we can slit/sheet this film to meet customer’s requirements. Please specify your specifications using our Contact Us page.
