(a) the ASTM International method ASTM D 1331-89 (Reapproved 2001), Standard Test Methods for Surface and Interfacial Tension of Solutions of Surface-Active Agents, except Method B, as amended from time to time, if measured with a tensiometer; or
a) conformément à la méthode ASTM D 1331-89 (réapprouvée en 2001) intitulée Standard Test Methods for Surface and Interfacial Tension of Solutions of Surface-Active Agents, de l’ASTM International, sauf la méthode B, avec ses modifications successives, si un tensiomètre est utilisé;
