ISO 1061:1990

Plastics — Unplasticized cellulose acetate — Determination of free acidity

Publication date: Nov 8, 1990

General information

Current stage: 90.93 Effective date: Jun 13, 2020

Originator: ISO

Owner: ISO/TC 61/SC 9

Type: International Standard

ICS: 83.080.20

Languages: French English

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Status: Published

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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

Revises
ISO 1061:1975

NOW

PUBLISHED
ISO 1061:1990
90.93 Standard confirmed
Jun 13, 2020

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