EN ISO 1061:1999

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

Publication date:   Dec 1, 2001

General information

60.60 Standard published   Jun 23, 1999


CEN/TC 249 Plastics

European Norm

83.080.01   Plastics in general



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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


EN ISO 1061:1999
60.60 Standard published
Jun 23, 1999


Adopted from ISO 1061:1990 IDENTICAL