Applicable to flexible insulating sleeving primarily for insulating conductors and connectors of electrical apparatus. Some of the types of sleeving are also suitable for binding, identification, environmental sealing and mechanical protection. This standard is not applicable to coated papers. Materials which conform to this specification meet established levels of performance. However, the selection of a material by a user for a specific application should be based on the actual requirements necessary for adequate performance in that application and not based on this specification alone. This second edition includes additional clauses providing clarification on the sheet numbering system, guidance on qualification approval requirements and a guide to tests that are size and/or colour dependant.