---
title: "ASTM D2556"
url: "https://mat-cs.com/astm-d2556/"
description: "This test method covers the measurement of the apparent viscosity of shear-rate-dependent adhesives using a rotational viscometer."
---

ASTM Standard

# ASTM D2556

Standard Test Method for Apparent Viscosity of Adhesives Having Shear-Rate-Dependent Flow Properties Using Rotational Viscometry

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## Significance and Use

4.1 The principle of measurement is based upon a reversible isothermal change in apparent viscosity with change in rate of shear produced by a change in rotational speed.

4.2 Measurement is performed with a rotational viscometer under standardized conditions with rigid control of the time intervals of measurement. Viscosity readings are obtained at the end of 1 min for each rotational speed. Changes from the lowest speed to the highest speed, and return to the lowest speed, are made without stopping the instrument.

## Scope

1.1 This test method covers the measurement of the apparent viscosity of shear-rate-dependent adhesives using a rotational viscometer.

1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.