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Significance and Use
The percent NCO is used to establish unit ratios for stoichiometric reactions with co-reactants.
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.
D841 Specification for Nitration Grade Toluene
ICS Number Code 71.080.99 (Other organic chemicals)
UNSPSC Code 12352118(Cyanates or isocyanates or thiocyantes or isothiocyanates); 31211511(Urethane primers)