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
8
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
8 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.
Rapperswil-Jona, Switzerland-based company and the world's largest dedicated transformer insulation specialist. Produces thermally upgraded kraft paper, pressboard cylinders, angle rings, and complete insulation systems for LPTs. Wholly-owned by the Weidmann family since 1877. Supplies all major transformer OEMs globally; considered the de facto standards setter for transformer insulation design.
Global power grid technology company; formerly ABB Power Grids (acquired by Hitachi in 2020). Revenue ~$12B (2024). Produces LPTs at plants in Varennes (Canada), Lodz (Poland), Halle (Germany), Jefferson City MO (US), and India. One of the three dominant global LPT manufacturers alongside Siemens Energy and GE Vernova. Hitachi Energy produces ~15% of US LPT imports. Long lead times (24–36 months) across all facilities.
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.
US chemical conglomerate (NYSE: DD). Divested its entire Aramids business (Kevlar + Nomex brands) to Arclin (TJC L.P.) for $1.8B; transaction closed April 1, 2026. DuPont invented Kevlar in 1965 (Stephanie Kwolek, Wilmington DE). After divestiture, DuPont retains no para-aramid production. The Spruance, Maydown, and Du Pont-Toray facilities are now operated by Arclin.
Chinese transformer pressboard / insulation-component maker; part of the growing Chinese supply cluster.
Japanese specialty-paper maker; transformer insulation paper/pressboard supplier.
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