Pressboard and presspaper for electrical purposes - Part 3: Specifications for individual materials - Sheet 1: Requirements for pressboard, types B.0.1, B.0.3, B.2.1, B.2.3, B.3.1, B.3.3, B.4.1, B.4.3, B.5.1, B.5.3 and B.6.1
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29.035.10 Paper and board insulating materials / Бумажные и картонные изоляционные материалы
IEC 60641-3-1:2008 gives the requirements for pressboard for electrical purposes comprised of 100 % sulphate wood pulp or a mixture of sulphate wood pulp and cotton. The main changes with respect to the previous edition are: - Requirements for types B.0.3 and B.5.3 were added; - The precompressed type B.3.1 was divided in B.3.1A and B.3.1B (higher flexibility); - Types B.6.1 has been replaced with a new type, but the designation has been kept; - Type B.7.1 has been deleted; - The thickness relation of the properties has been simplified; and - The values were adjusted to today's needs of users.