International Standard
ISO 1061:1990
Plastics — Unplasticized cellulose acetate — Determination of free acidity
Reference number
ISO 1061:1990
Edition 2
International Standard
Read sample
ISO 1061:1990
Published (Edition 2, 1990)
This standard was last reviewed and confirmed in 2020. Therefore this version remains current.

ISO 1061:1990

ISO 1061:1990
CHF 42
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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.

General information

  •  : Published
     : 1990-11
    : International Standard confirmed [90.93]
  •  : 2
     : 2
  • ISO/TC 61/SC 9
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