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ISO 9020:1994

Binders for paints and varnishes — Determination of free-formaldehyde content of amino resins — Sodium sulfite titrimetric method

95.99 Withdrawal of Standard   Mar 3, 2004

General information

95.99     Mar 3, 2004

ISO

ISO/TC 35

International Standard

87.060.20  

Scope

The method specified is based on reacting free formaldehyde and alcohol formaldehyde semiacetals in a test portion with excess sodium sulfite solution at a temperature of 0 °C to form hydroxymethane sulfonate, titrating the excess sodium sulfite with iodine solution, decomposing hydroxymethane sulfonate with sodium carbonate solution and titrating the sodium sulfite liberated with iodine solution. The method is applicable to resins resulting from the polycondensation of urea and melamine with formaldehyde and to furan resins resulting from the polycondensation of furfuryl alcohol with formaldehyde without further modification.

Life cycle

NOW

WITHDRAWN
ISO 9020:1994
95.99 Withdrawal of Standard
Mar 3, 2004

CORRIGENDA / AMENDMENTS

Corrected by
ISO 9020:1994/Cor 1:1996

REVISED BY

ABANDON
ISO/DIS 11402

PUBLISHED
ISO 11402:2004

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