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This guide is established in response to regulatory requirements for the determination of complex branched phthalates by CAS numbers. This guide is intended to provide information on how to interpret and analyze data from a chromatographic analysis involving complex phthalates with defined CAS numbers. This guide provides a logical approach to determine levels of complex branched phthalates meeting regulatory and CAS number requirements. The specific complex phthalates covered within this guide are DINP and DIDP. Limitations—This guide does not recommend any specific test method. In some cases, it is necessary to deduce the quantity of substance present through the analysis and quantification of its components. Although this approach is routinely used some degree of uncertainty exists in the final result due to the reduced accuracy of the method. The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 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. 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.