ISO 28706-3:2017描述了测定在25℃和95℃之间的温度下由碱性液体侵蚀的玻璃质和搪瓷制品的电阻的测试方法。所使用的设备是一个六角形容器，其中六个搪瓷样品或四个玻璃瓶，其中同时测试四个搪瓷样品。 注1:可以确定对任何碱性液体的耐受性。然而，该测试方法最初用于测定在中性和碱性范围内用于洗涤纺织品的热洗涤剂溶液的耐受性。 注2:由于洗涤剂的组成不断变化，所以规定了一种标准的测试溶液，就其碱性，润湿性能和络合行为而言，可以认为是市场上洗涤剂的典型组成。标准测试溶液的pH值和碱度取决于三聚磷酸钠，碳酸钠和过硼酸钠的存在比例;三聚磷酸钠同时作为络合剂。标准测试溶液的润湿性能通过加入烷基磺酸盐获得。不考虑更高的过硼酸钠含量因为氧对牙釉质的作用是不重要的，并且过硼酸盐含量的增加不引起标准测试溶液的碱度的任何显着改变。使用这种标准测试溶液和其他测试溶液（包括5％焦磷酸钠溶液）对不同瓷釉进行的测试证明使用这种标准测试溶液来测定搪瓷对热洗涤剂溶液的耐受性是合理的。

ISO 28706-3:2017 describes a test method for the determination of the resistance of vitreous and porcelain enamelled articles to attack by alkaline liquids at temperatures between 25 °C and 95 °C. The apparatus used is a hexagonal vessel in which six enamelled specimens or a tetragonal glass bottle in which four enamelled specimens are simultaneously tested. NOTE 1 The resistance to any alkaline liquid can be determined. However, the test method was originally used for the determination of the resistance to hot detergent solutions, within the neutral and alkaline range, used for washing textiles. NOTE 2 Since detergents are continually subject to alterations in their composition, a standard test solution is specified which, in respect to its alkalinity, wetting properties and complexing behaviour, can be considered as a typical composition for the detergents present on the market. The pH value and alkalinity of the standard test solution depend on the proportions of sodium tripolyphosphate, sodium carbonate and sodium perborate present; sodium tripolyphosphate acts simultaneously as a complexing agent. The wetting properties of the standard test solution are obtained by the addition of alkylsulfonate. A higher sodium perborate content is not considered necessary since the effect of oxygen on enamel is unimportant and an increase in the perborate content does not cause any significant alteration in the alkalinity of the standard test solution. The testing of different enamels using this standard test solution and other test solutions (including 5 % sodium pyrophosphate solution) has justified the use of this standard test solution for determining the resistance of enamels to hot detergent solutions.