ISO 3681:2018 PDF

Scope: This document specifies a titrimetric method for determining the esterified-acid content in binders for paints and varnishes, free acids and acid anhydrides being necessarily included in the result obtained. Because different binders vary in their resistance to saponification, this document is of limited applicability. If necessary, completeness of saponification can be checked by repeating the test under more severe conditions achieved by the use of longer saponification time, more concentrated potassium hydroxide solution, or a higher-boiling alcohol as solvent. Annex A specifies a procedure suitable for binders that saponify with difficulty. The method is not applicable to those materials that show further reaction with alkalis beyond normal saponification.

ISO 3681:2018 Referenced Document

ISO 15528 Paints, varnishes and raw materials for paints and varnishes — Sampling*， 2020-05-13 Update
ISO 3696 Water for analytical laboratory use; Specification and test methods
ISO 385 Laboratory glassware - Burettes
ISO 4618 Paints and varnishes — Vocabulary*， 2023-02-06 Update
ISO 648 Laboratory glassware - Single-volume pipettes

2018 ISO 3681:2018 Binders for paints and varnishes — Determination of saponification value — Titrimetric method
1996 ISO 3681:1996 Binders for paints and varnishes - Determination of saponification value - Titrimetric method
1983 ISO 3681:1983 Binders for paints and varnishes; Determination of saponification value; Titrimetric method
1976 ISO 3681:1976 Title missing - Legacy paper document