Significance and Use
This test method can be used for research or for quality control to characterize toluene diisocyanates. Hydrolyzable chlorine correlates with performance in some polyurethane systems.
1.1 This test method determines the hydrolyzable chlorine content of toluene-2,4-diisocyanate, toluene-2,6-diisocyanate, or mixtures of the two. It is acceptable to apply this test method to other isocyanates of suitable solubility. (See Note 1.) The main sources of hydrolyzable chlorine in the isocyanates are carbamoyl chloride and dissolved phosgene. Both of these compounds react with alcohols and water, forming ureas, carbamates, carbon dioxide, and hydrochloric acid. (See Note 2.)
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—It is possible that this test method is applicable crude polymeric isocyanates. However, the precision with crude polymeric isocyanates has not been established.
Note 2—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
D1193 Specification for Reagent Water
aromatic isocyanates; hydrolyzable chlorine; isocyanates; polyurethane raw materials; titration; toluene diisocyanate; Carbamoyl chloride; Carbon dioxide; Chlorine content--plastics; Hydrochloric acid (HCL); Hydrolyzable chlorine; Isocyanates; Methanol (methyl alcohol); Phosgene (dissolved); Polyurethane raw materials--isocyanates; Quality control (QC)--plastics; Reactivity; Toluene diisocyanate (TDI);
ICS Number Code 83.080.10 (Thermosetting materials)
ASTM International is a member of CrossRef.
Citing ASTM Standards
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