DIN EN ISO 11402 Berichtigung 1-2006 酚醛树脂、氨基树脂和缩合树脂.游离甲醛含量的测定
Phenolic, amino and condensation resins - Determination of free-formaldehyde content (ISO 11402:2004); German version EN ISO 11402:2005, Corrigenda to DIN EN ISO 11402:2005-09; German version EN ISO 11402:2005/AC:2006
This International Standard specifies three methods for determining the free-formaldehyde content in the following: a) Phenolic resins, by potentiometric titration in aqueous or organic solution (hydroxylamine hydrochloride procedure). The method is applicable to resins with free-formaldehyde contents up to and including 15 % by mass. For free-formaldehyde contents between 15 % by mass and 30 % by mass, it may be necessary to adjust the concentrations of the standard volumetric solutions used accordingly. b) Amino resins and furan resins (sulfite procedure). The method is applicable to resins resulting from the polycondensation of urea and melamine with formaldehyde and to furan resins resulting from the polycondensation of furfuryl alcohol with formaldehyde without further modification. c) Condensation resins (KCN procedure), including urea resins, furan resins, melamine resins and phenolic resins, as well as combinations and modifications of these resins.