manufactured · input
Electrotechnical kraft paper and pressboard made from highly purified unbleached sulfate cellulose, used to wrap transformer windings and form inter-winding barriers. Thermally upgraded (TU) grades (Nomex blended or chemical treatment) are required for modern 65°C and 80°C rated transformers. Ahlstrom-Munksjö's Jönköping, Sweden mill is the only facility capable of producing electrotechnical crepe kraft paper to 3,000 mm width.
5
Source countries
3
Companies
1
Goods affected
0
Claims on record
What depends on it
1 essential American goods rely on transformer insulation kraft paper & pressboard somewhere upstream in their supply chain.
Where it comes from
Share of global supply, by country.
| Country | Share of supply |
|---|---|
| SESweden | 30% |
| CNChina | 25% |
| CHSwitzerland | 20% |
| FIFinland | 15% |
| DEGermany | 8% |
Who makes it
3 companies produce transformer insulation kraft paper & pressboard.
Helsinki-based specialty fiber materials company. Its Jönköping, Sweden mill is the only facility in the world capable of producing electrotechnical crepe kraft paper in widths up to 3,000 mm — essential for high-voltage transformer winding insulation. Ahlstrom supplies approximately 30% of global transformer kraft paper.
Global leader in electrical insulation systems for power and distribution transformers. Headquartered in Rapperswil-Jona, St. Gallen, Switzerland. ~20 locations worldwide, ~3,300 employees. Products include kraft flat paper, crepe paper, coated paper, transformer board, and complete insulation systems. Subsidiary of Weidmann Group (Swiss family company). Supplies transformer OEMs globally including ABB/Hitachi Energy, Siemens Energy, GE Vernova. Commands ~15% global share of the transformer insulation paper, pressboard, and component market.
German manufacturer of electrical insulation materials with 100+ year history. Primary facility in Vaihingen/Enz, Baden-Württemberg. Products include presspaper, pressboard, diamond-dotted presspaper (DPP), kraft paper, corrugated board, and complete insulation component sets for oil-filled power and distribution transformers. One of the world's leading manufacturers of transformer presspaper/pressboard. Serves transformer OEMs across Europe and internationally.
