This part of the standard specifies a method of designation for epoxy resins. The objective of this designation method is to allocate to each commercial product a group of digits, called the ""designation"", giving in a coded form certain information on the product: chemical base, approximate values of main properties and the nature of modifiers, solvents or additives. Thus, all products having similar characteristics and therefore likely to have the same uses will have the same designation, so aiding users in their choice, provided that manufacturers quote the designation in their data sheets.