This part of ISO 14530 establishes a data block system for the designation of unsaturated-polyester powder moulding compounds (UP-PMCs). The various types of UP-PMC are differentiated from each other by a classification system based on information about the filler/reinforcement type and content, the intended method of processing, any special properties and those of the special properties used specifically for designation purposes (designatory properties). This part of ISO 14530 is applicable to all UP-PMCs ready for normal use in the form of powder, granules or ground material. It is not intended to imply that materials having the same designation necessarily give the same performance. This part of ISO 14530 does not provide engineering data, performance data or data on processing conditions which may be required to specify a material for a particular application and/or method of processing. If such additional properties are required, they shall be determined in accordance with the test methods specified in ISO 14530-2, if suitable. Whenever general requirement data, as covered by ISO 14530-3, neeed to be indicated, this is also done using this data block system. To ensure that code-letters and code-numbers remain unambiguous, and to avoid conflicts witin the system, any new code-letters or code-numbers for use in data block 1, 2 or 3 shall be approved before use by the secretariats of ISO/TC 61/SC 1, SC 12 and SC 13.