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

1. 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 and health practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements, see Section 8.

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

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; 2,4–Diisocyanate based intermediate; Isobutyl alcohol; Isocyanates; Prepolymers; Toluene; Urethane intermediate/prepolymer; Urethanes;

ICS Code

ICS Number Code 71.080.99 (Other organic chemicals)

Citing ASTM Standards

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