ISO 1389-3:1977
Phthalic anhydride for industrial use; Methods of test; Part III : Measurement of colour stability

Standard No.

ISO 1389-3:1977

Release Date

1977

Published By

International Organization for Standardization (ISO)

Status

Withdraw 2002-05

Latest

ISO 1389-3:1977

Scope

The principle is based on the measurement of the colour of a test portion, by the method specified in ISO 2211, after a specified heat treatment. The test sample is maintained in a colorimetric tube in an electrically heated aluminium block, controlled at (250 3) ?C for 90 min, in the molten state. The results are expressed in Hazen units. - ISO 1389, Parts 1 to 11, replace ISO Recommendation R 1389-1970.

ISO 1389-3:1977 history

• 1977 ISO 1389-3:1977 Phthalic anhydride for industrial use; Methods of test; Part III : Measurement of colour stability