Thermally Upgraded Kraft
Thermally Upgraded Kraft
Kraft paper treated with nitrogenous compounds to resist thermal aging, increasing transformer load capability and service life.
Priced per requirement — tell us grade, width, thickness and quantity and we quote against it.
Technical specifications
| Composition | Kraft cellulose, thermally upgraded cellulose, or aramid |
|---|---|
| Standard | IEC 60554 for cellulose papers |
| Thermal class | 105 °C plain kraft, 120 °C thermally upgraded, 220 °C aramid |
| Thickness range | 0.05–0.50 mm typical |
| Width range | Slit to requirement |
| Oil compatibility | Compatible with mineral, ester and silicone transformer fluids |
| Form | Reels and slit tapes; crepe supplied on rolls |
| Compliance | RoHS, REACH; mill test certificate with every consignment |
Typical values for this material class, given as a guide. The datasheet carries the property table, test methods and tolerances for the grade and is the governing document.
Overview
Kraft paper treated with nitrogenous compounds to resist thermal aging, increasing transformer load capability and service life.
Sizes, packing and supply
Supplied to your specification — grade, thickness, width and quantity, cut and slit to your dimensions rather than sold from fixed stock sizes. Mill test certificate and certificate of conformity accompany every shipment.
Standards and compliance
- Manufactured to IEC 60641 / IEC 60554 where the grade is covered
- Mill test certificate and certificate of conformity with every consignment
- RoHS and REACH declarations on request
Third-party testing can be arranged where a specification demands independent verification.
Applications
Conductor covering
Wrapping rectangular and round conductors before the coil is wound.
Layer insulation
Between winding layers, where thickness and consistency decide the build.
Lead and joint wrap
Creped grades around lead-outs and transitions that a flat paper would tear on.
Continuously transposed conductor
Paper covering applied over CTC before impregnation.
Quality and inspection
Every consignment is inspected before shipment and supplied with its mill certificate. For repeat programmes we hold the approved specification on file, so a reorder repeats a known outcome rather than reopening the conversation.
Frequently asked questions
Plain kraft or thermally upgraded?
Thermally upgraded paper is chemically modified to slow ageing, which raises the rated hot-spot temperature. Where the design runs hot or the expected life is long, it is the cheaper decision even though the paper costs more.
Can you slit to our width?
Yes, slit to your dimensions rather than sold from fixed stock widths, so there is no need to buy wide and trim.
Is it compatible with ester fluids?
The cellulose grades are used in mineral, natural and synthetic ester systems. Tell us the fluid and we will confirm against the manufacturer's data.
What documentation comes with it?
Mill test certificate and certificate of conformity with every consignment, plus the commercial export set. RoHS and REACH declarations on request.
Datasheet
Full property tables, test methods and tolerances for Thermally Upgraded Kraft are on the datasheet. Request it and we will send the current revision.
Related products
Next step
Tell us the size and quantity
Send the thickness, slit width and annual volume for https://transformerinsulation.com/wp-content/themes/transformerinsulation and we come back with a costed offer, a firm lead time and the mill certificate you will receive with it.
Request a quote
Tell us the size and quantity
Tell us the grade, thickness, width and quantity. We come back with a costed offer and the datasheet, and say plainly if anything will not work.