GB/T 5019.8-2009 Part 8 of the standard for insulating materials based on mica, focusing on Glass cloth to reinforce B-stage epoxy resin gluing mica tape. The standard clarifies the requirements for its Appearance and size specifications, specifies performance indicators such as electrical insulation and mechanical strength, and describes test methods and inspection rules in detail. At the same time, it standardizes the content of marking, Encasement, transportation and storage, etc., to provide unified technical guidelines for the production mass control and application of this type of mica tape.