This sheet contains the requirements for crêpe paper, as defined in I E C Publication 554-1, Part 1: Definitions and General Requirements, classified as: Type 3.1: A hard, comparatively non-absorbent, crêped kraft insulating paper made from base papers of low (L) or medium (M) permeability, such as Types 1.3-2M and 1.3-2L described in Table I of I E C Publication 554-1. Type 3.2: A soft, porous, crêped kraft insulating paper made from base papers of high (H) permeability, such as Type 1.2-2H described in Table I of I E C Publication 554-1.