ASTM D7252-22 PDF

Scope: 1.1 This test method determines the percent by weight of monomeric isomers and total monomer in crude or modified isocyanates. The test method is applicable to methylene di(phenylisocyanate) (MDI) and polymeric (methylene phenylisocyanate) (PMDI). (See Note 1.) 1.2 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 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. NOTE 1—There is no known ISO equivalent to this standard. 1.4 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.

ASTM D7252-22 Referenced Document

ASTM D883 Standard Terminology Relating to Plastics*， 2024-02-01 Update
ASTM E2935 Standard Practice for Evaluating Equivalence of Two Testing Processes
ASTM E456 Standard Terminology for Relating to Quality and Statistics
ASTM E682 Standard Practice for Liquid Chromatography Terms and Relationships
ASTM E691 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

2022 ASTM D7252-22 Standard Test Method for Polyurethane Raw Materials: Determination of Monomer and Isomers in Isocyanates
2017 ASTM D7252-17 Standard Test Method for Polyurethane Raw Materials: Determination of Monomer and Isomers in Isocyanates
2006 ASTM D7252-06(2011)e1 Standard Test Method for Polyurethane Raw Materials: Determination of Monomer and Isomers in Isocyanates
2006 ASTM D7252-06 Standard Test Method for Polyurethane Raw Materials: Determination of Monomer and Isomers in Isocyanates