What Is Aromatic (Aramid) Paper Insulation?
Quick answer — Aramid (aromatic polyamide, e.g. Nomex) paper is a high-temperature, high-strength insulation used where a higher thermal class or better mechanical/thermal endurance is needed than standard kraft paper — for example in dry-type and high-class transformers, and in the hottest spots of a liquid-filled unit. It is class H (180 C) capable and very tough.
What is aramid / aromatic paper insulation and when is it used?
What it is
Aramid paper is made from aromatic polyamide fibres and is supplied in various grades and thicknesses. It has excellent thermal (class H, 180 C) and mechanical properties.
Where it is used
Dry-type transformers and high-temperature insulation, and in liquid-filled units at the hottest spots, on lead exits, and where higher mechanical strength is needed.
Trade-off
It is more expensive than kraft or pressboard but allows a higher operating temperature and longer life, so it pays off where load and temperature are high.
References & standards
- IEC 60076-11 (dry-type)
- IEC 60085 (thermal classification)
Related
Related manufacturers
Prolec GE (GE Vernova) · Eaton · Virginia Transformer Corp · Delta Star · WEG Transformers USA · LS Electric America
Related components
Technical content is prepared from engineering references, standards frameworks, manufacturer documentation and industry sources. Contractual or compliance decisions should refer to current official standards. TransformerPath Technical Editorial.
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