ISO 3681:2018
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Liants pour peintures et vernis — Détermination de l’indice de saponification — Méthode titrimétrique
| Published By | Publication Date | Number of Pages |
| ISO | 2018-11 | 12 |
Le présent document prescrit une méthode titrimétrique pour la détermination de la teneur en acides estérifiés des liants pour peintures et vernis tenant compte nécessairement des acides libres et des anhydrides d'acide.
En raison des variations de la résistance à la saponification des différents liants, le domaine d'application du présent document est limité. Si nécessaire, la saponification complète peut être vérifiée en recommençant l'essai dans des conditions plus strictes avec une durée de saponification plus longue, une solution d'hydroxyde de potassium plus concentrée ou un alcool à point d'ébullition plus élevé comme solvant.
L'Annexe A spécifie un mode opératoire adapté aux liants difficilement saponifiables.
La méthode n'est pas applicable aux produits présentant une réaction supplémentaire aux alcalis, après la saponification normale.
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