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ISO 1061:1990

Plastics — Unplasticized cellulose acetate — Determination of free acidity

Nov 8, 1990

General information

90.20     Apr 15, 2025

ISO

ISO/TC 61/SC 9

International Standard

83.080.20  

French   English  

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Scope

The free acidity determined by this method includes acidity extractable by water and acidity due to acidic groups directly attached to the cellulose acetate, e.g. carboxyl groups. This method is not suitable for cellulose acetate containing any additives which may affect the test. The principle consists in treating a test portion of cellulose acetate with water and titrating the resultant solution with sodium hydroxide solution. The free acidity is calculated as the percentage, by mass, of free acetic acid in the cellulose acetate. This second edition cancels and replaces the first edition ISO 1061:1975, of which it constitutes a minor technical revision.

Life cycle

PREVIOUSLY

WITHDRAWN
ISO 1061:1975

NOW

PUBLISHED
ISO 1061:1990
90.20 Standard under periodical review
Apr 15, 2025

National adoptions

SRPS EN ISO 1061:2012  
ISS

Plastics - Unplasticized cellulose acetate - Determination of free acidity (ISO 1061:1990)

60.60   Standard published

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