The "JC/T 423-1991 Water-soluble interior-wall Coatings" standard specifies the technical requirements and test methods for water-soluble interior-wall Coatings, which are applicable to interior-wall Decorative Coatings with aqueous compounds as binders. The standard includes the performance requirements of coatings, such as viscosity, fineness, hiding power, whiteness, etc., which are classified into Class I for bathrooms and kitchens and Class II for general walls. The standard also describes the test methods and equipment requirements in detail to ensure that the Appearance, water resistance, adhesion and abrasion resistance of the coating after construction meet the predetermined standards and ensure its actual use effect in the interior-wall of the building.