UNE 21347-2:1991
MATERIALES AISLANTES ELECTRICOS. MATERIALES A BASE DE MICA. ESPECIFICACIONES PARA MATERIALES PARA CALEFACCION
SPECIFICATION FOR INSULATING MATERIALS BASED ON MICA. PART 2: SPECIFICATIONS FOR INDIVIDUAL MATERIALS. SHEET 2: SPECIFICATION FOR RIGID MICA MATERIALS FOR HEATING EQUIPMENT.