Gives definitions of terms used to describe built-up mica materials, products based on them and mica paper. It also deals with general requirements and conditions of supply. Changes in this new edition include: - a new Clause 2: Normative references; - under Clause 4: Description of material - new Subclause 4.2.1 to cover flexible mica material impregnated with B stage resin, - new Subclause 4.2.2 to cover flexible mica material, porous for post-impregnation; - a new Clause 5 covering general requirements and conditions of supply.