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.
EN ISO 3681-2018由CEN - European Committee for Standardization 发布于 2018-12-01，并于 2018-12-21 实施。
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