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Significance and Use
5.1 This test method can be used for research or for quality control to determine the dimer ratio of Pure MDI.
5.2 Uretidinedione begins forming in Pure MDI with the rate of formation increasing with increasing temperature. High levels can affect the appearance of Pure MDI and the quality of products made from it.
1.1 This test method determines the ratio of the infrared absorbance of uretidinedione (dimer) in methylene-4,4’- di(phenylisocyanate) to an infrared absorbance at a reference wavelength within the same material. It is applicable to monomeric methylene-di(phenylisocyanate), or “Pure MDI,” containing 95 % or greater methylene-4,4’-di(phenylisocyanate).
1.2 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.
Note 1: There is no known ISO equivalent to this standard.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D883 Terminology Relating to Plastics
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
ICS Number Code 83.040.10 (Latex and raw rubber)
UNSPSC Code 12352118(Cyanates or isocyanates or thiocyantes or isothiocyanates)
|Link to Active (This link will always route to the current Active version of the standard.)|
ASTM D8036-16, Standard Test Method for Polyurethane Raw Materials: Determination of Dimer Ratio in Pure MDI, ASTM International, West Conshohocken, PA, 2016, www.astm.orgBack to Top