TS EN 60641-1

TS EN 60641-1 is the standard that sets out the definitions, classification framework, and general requirements for pressboard and presspaper used for electrical purposes. These are cellulose-based insulating materials used where electrical insulation must be combined with mechanical strength, such as in transformers, motors, and other electrical equipment.

How the terminology and classes are organised

The main role of this part is to provide a consistent technical language for pressboard and presspaper. In general engineering terms, pressboard is associated with thicker and mechanically stronger insulating parts, while presspaper is used for thinner insulation layers. For these materials, thickness, density, surface characteristics, and electrical behaviour are all important to their practical use in insulation systems.

The general requirements in this part help define a common baseline for products intended for electrical applications, supporting comparison and specification across the material range. The abstract also indicates several edition changes: surface finish is no longer specified in the standard, fixed nominal thicknesses have been replaced by preferred thicknesses, and types B.6 and P.6 have been revised while keeping their designations; types B.7 and P.7 have been deleted.

• Contains definitions for pressboard and presspaper for electrical purposes.
• Sets out the general requirements for these materials.
• Surface finish is no longer specified in the standard in this edition.
• Fixed nominal thicknesses have been replaced by preferred thicknesses.
• Types B.7 and P.7 have been deleted, while B.6 and P.6 have been retained as designations.