ISO 11402:2004规定了以下三种测定游离甲醛含量的方法: 酚醛树脂，通过水溶液或有机溶液中的电位滴定（盐酸羟胺程序）。该方法适用于游离甲醛含量为15质量%以上且包含15质量%的树脂。对于游离甲醛含量在15质量%至30质量%之间，可能需要相应地调整所用标准容量溶液的浓度。氨基树脂和呋喃树脂（亚硫酸盐法）。该方法适用于由尿素和三聚氰胺与甲醛缩聚得到的树脂和由糠醇与甲醛缩聚得到的呋喃树脂而无需进一步改性。缩聚树脂（KCN方法），包括尿素树脂、呋喃树脂、三聚氰胺树脂和酚醛树脂，以及这些树脂的组合和改性。本国际标准的目的是建立公认的和有用的确定程序（例如，检查是否遵守关于处理危险工作场所材料的官方法规）。 使用本国际标准测定的甲醛缩合树脂中的游离甲醛含量代表测定时的实际含量。该值与加工期间或加工后的游离甲醛含量没有定量关系。

ISO 11402:2004 specifies three methods for determining the free-formaldehyde content in the following:

1. 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.
2. 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.
3. Condensation resins (KCN procedure), including urea resins, furan resins, melamine resins and phenolic resins, as well as combinations and modifications of these resins.

The purpose of this International Standard is to establish recognized and useful determination procedures (for instance in order to check whether official regulations on the handling of hazardous workplace materials are observed). The free-formaldehyde content determined in formaldehyde condensation resins using this International Standard represents the actual content at the time of the determination. The value bears no quantitative relationship to the free-formaldehyde content during or after processing.