ISO 2750:1974
Urea for industrial use; Measurement of colour in Hazen units (platinum-cobalt scale) of a urea-formaldehyde solution

Standard No.

ISO 2750:1974

Release Date

1974

Published By

International Organization for Standardization (ISO)

Status

Withdraw 2002-05

Latest

ISO 2750:1974

Scope

Lays down the principle of the visual comparison of the colour of a solution of the sample in formaldehyde, stabilized at a pH of 10 0.1, with that of colour standards. Expression of the results in terms of Hazen units. For routine control purposes, referring to ISO 2211. The method has also been approved by the IUPAC.

ISO 2750:1974 history

• 1974 ISO 2750:1974 Urea for industrial use; Measurement of colour in Hazen units (platinum-cobalt scale) of a urea-formaldehyde solution