5.1 The regulatory candidate list classifies substances by CAS number. Complex branched phthalates, such as DINP or DIDP, manufactured with a defined alcohol distribution and registered by CAS number with a chemical description of the composition, shall be considered a single substance with that composition as described.

5.2 It is possible for the alcohols used in the manufacture of complex branched phthalates to vary in isomer composition. Care must be used to ensure a representative standard is used to the quantitation of the level of a complex branched phthalate.

5.3 This guide is intended to provide a method on how to interpret and determine data from an analysis involving complex branched phthalates with defined CAS numbers. The test procedure employed shall be used to provide speciation information to assist use of the schematic flow diagram.

Note 3: A discussion on analytical challenges in complex branched phthalate analysis is found in: “Analytical Challenges in Detecting Regulated Phthalates in Flexible PVC Products,” SPI Flexible Vinyl Products Division, 23rd Annual Compounding Conference, July 17, 2012.

1.1 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.

1.2 This guide provides a logical approach to determine levels of complex branched phthalates meeting regulatory and CAS number requirements.

1.3 The specific complex phthalates covered within this guide are DINP and DIDP.

1.4 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.

1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.6 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 and health practices and determine the applicability of regulatory limitations prior to use.