ASTM-D2572 › Standard Test Method for Isocyanate Groups in Urethane Materials or Prepolymers

ASTM-D2572 - 2019 EDITION - CURRENT
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Standard Test Method for Isocyanate Groups in Urethane Materials or Prepolymers
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Scope

1.1 This test method covers the determination of the isocyanate group (NCO) content of a urethane intermediate or prepolymer.

1.2 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. For specific hazard statements, see Section 8.

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.

Significance and Use

4.1 The percent NCO is used to establish unit ratios for stoichiometric reactions with co-reactants.

Keywords

dicyclohexylmethane-4,4-diisocyanate (rMDI); hexamethylene diisocyanate; isophorone diisocyanate (IPDI); polymeric MDI; toluene, 2,4-diisocyanate based intermediate; toluene, 2,4-diisocyanate based prepolymer; urethane intermediate; urethane prepolymer; 2,4-diphenylmethane diisocyanate; 4,4-diphenylmethane diisocyanate;

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Document Number

ASTM-D2572-19

Revision Level

2019 EDITION

Status

Current

Modification Type

Reinstated

Publication Date

Oct. 1, 2019

Document Type

Test Method

Page Count

2 pages

Committee Number

D01.33