Electrical insulation paper

WIMA metallized paper (MP) capacitors rated X2, or "across the line" operation (typically in EMI suppression filters). These can safely connected to low-impedance AC mains at rated AC voltage (here, 250 and 275V). "Ordinary" capacitors may not be connected "across the line" even if their DC ratings are well above AC voltage. 40/110/56 marking denotes climate conditions per IEC 60068–1 (-40˚C to +110˚C).

Electrical insulation papers are paper types that are used as electrical insulation in many applications due to pure cellulose having outstanding electrical properties. Cellulose is a good insulator and is also polar, having a dielectric constant significantly greater than one.^[1] Electrical paper products are classified by their thickness, with tissue considered papers less than 1.5 mils (0.0381 mm) thickness, and board considered more than 20 mils (0.508 mm) thickness.^[2]

^ Paulapuro, Hannu (2000). "5". Paper and Board grades. Papermaking Science and Technology. Vol. 18. Finland: Fapet Oy. pp. 106–108. ISBN 952-5216-18-7.
^ ASTM Paper and paperboard: characteristics, nomenclature, and significance of tests, ASTM, 1951 page 26

[1] Paulapuro, Hannu (2000). "5". Paper and Board grades. Papermaking Science and Technology. Vol. 18. Finland: Fapet Oy. pp. 106–108. ISBN 952-5216-18-7.

[2] ASTM Paper and paperboard: characteristics, nomenclature, and significance of tests, ASTM, 1951 page 26

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