ASTM D4663-98
Historical Standard: ASTM D4663-98 Standard Test Method for Polyurethane Raw Materials Determination of Hydrolyzable Chlorine of Isocyanates
SUPERSEDED (see Active link, below)
ASTM D4663
1. Scope
1.1 This test method determines the hydrolyzable chlorine content of toluene-2,4-diisocyanate, toluene-2,6-diisocyanate, or mixtures of the two. This test method may also be applied 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 problems, 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. For specific hazards statements see Note 3.
Note 1-This test method may be applicable with crude polymeric isocyanates. However, the precision with crude polymeric isocyanates has not been established. Note 2-There is no equivalent ISO 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.
ASTM Standards
D883 Terminology Relating to Plastics
D1193 Specification for Reagent Water
Keywords
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 Code
ICS Number Code 83.080.10 (Thermosetting materials)
DOI: 10.1520/D4663-98
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