This specification covers the requirements for HFC-125 (pentafluoroethane, C₂HF₅) as a fire-fighting medium. It does not however address the fire-fighting equipment or hardware that employs HFC-125, the conditions of employing such equipment like hand helds, fixed installations, etc., or the storage and transportation of HFC-125. Samples of HFC-125 taken in the liquid phase shall be taken from filled containers in accordance to a specific method and shall be tested for quality conformance using gas chromatography, sodium hydroxide titration, and Karl Fischer methods. HFC-125 shall conform to the purity, acidity, water content, nonvolatile residue, presence of fixed gases in the vapor phase, and suspended matter or sediment requirements when tested by the appropriate test methods.

1.1 This specification covers the requirements for HFC-125 as a fire-fighting medium.

1.2 This specification does not address the fire-fighting equipment or hardware that employs HFC-125 or the conditions of employing such equipment, for example, hand helds, fixed installations, etc.

1.3 This specification does not address the storage or transportation of HFC-125. Storage, handling, and transportation issues are addressed in Practice D6268.

1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.

1.5 The following safety hazards caveat pertains to the test methods portion, Section 6, of this specification. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific hazards statements are given in 4.3.

1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.