Significance and Use
These test methods can be used for research or for quality control to characterize isocyanates used in polyurethane products.
1. Scope
1.1 These test methods measure the isocyanate content of aromatic isocyanates used as polyurethane raw materials.
1.1.1 Test Method A—Unheated toluene-dibutylamine determines the toluene diisocyanate content, the amine equivalent and the isocyanate content of refined toluene-2,4-diisocyanate and toluene-2,6-diisocyanate, or mixtures of the two. Other isomers, if present, will be included in the determination. This test method may also be applied to other isocyanates of suitable reactivity and solubility.
1.1.2 Test Method B—Heated toluene-dibutylamine determines the amine equivalent and the isocyanate content of crude or modified isocyanates derived from toluene diisocyanate, methylene di-(4-phenylisocyanate) and polymeric (methylene phenylisocyanate).
1.1.3 Test Method C—Unheated trichlorobenzene-toluene-dibutylamine determines the amine equivalent and the isocyanate content of crude or modified isocyanates derived from toluene diisocyanate, methylene-di-(4-phenylisocyanate) and polymeric (methylene 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—Method C of this test method is equivalent to Method B of ISO 14896.
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
E180 Practice for Determining the Precision of ASTM Methods for Analysis and Testing of Industrial and Specialty Chemicals
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
ISO Standard
ISO14896 Polyurethane Raw Materials-Determination of Isocyanate Content
Keywords
isocyanates; isocyanates aromatic; methylene-bis-(4-phenylisocyanate); polymethylene polyphenylisocyanate; polyurethane; raw materials; test method; titration; toluene diisocyanate; Dibutylamine; Heated toluene-dibutylamine method; Isocyanates; Methylene-bis-(4-phenylisocyanate); Polymethylene polyphenylisocyanate; Polyurethane raw materials--isocyanates; Toluene diisocyanate (TDI); Unheated toluene-dibutylamine method; Unheated trichlorobenzene toluene-dibutylamine method ;
ICS Code
ICS Number Code 83.080.20 (Thermoplastic materials)
DOI: 10.1520/D5155-10
ASTM International is a member of CrossRef.
Citing ASTM Standards
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