ISO 817-2014 pdf free.Refrigerants一Designation and safety classification. ISO 817 provides an unambiguous system for assigning designations to refrigera nts. It also establishes a system for assigning a safety classification to refrigerants based on toxicity and flammability data, and provides a means of determining the refrigerant concentration limit. Tables listing the refrigerant designations, safety classifications and the refrigerant concentration limits are included based on data made available. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable to its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. A N SI/AS HR A E Standard 34, Designation and Safety Classification of Refrigerants ASTM E681, Standard Test Method for Concentration Limits of Flammability of Chemicals (Vapours and Gases) 3 Terms, definitions, abbreviated terms and symbols 3.1 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1.1 acute toxicity adverse health effect(s) from a single, short-term exposure 3.1.2 acute-toxicity exposure limit ATEL maximum recommended refrigerant concentration determined in accordance with the established systems and intended to reduce the risks of acute toxicity hazards…