---
title: "ASTM D2572"
url: "https://mat-cs.com/astm-d2572/"
description: "This test method covers the determination of the isocyanate group (NCO) content of a urethane intermediate or prepolymer."
---

ASTM Standard

# ASTM D2572

Standard Test Method for Isocyanate Groups in Urethane Materials or Prepolymers

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## Significance and Use

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

## 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.