ISO 8501-4 《Preparation of steel substrates before application of paints and related products — Visual assessment of surface cleanliness — Part 4: Initial surface conditions, preparation grades and flash rust grades in connection with water jetting》 Related products

ISO 8501-4 is part of the visual assessment criteria for surface cleanliness of steel surface preparation before painting. This part is the initial surface condition, treatment grade and flash rust grade during water spraying. The standard specifies the method for evaluating the surface cleanliness of steel during water spraying treatment to ensure that the steel surface is suitable for painting. The standard defines different initial surface conditions, treatment grade and flash rust grade and provides corresponding assessment criteria. Specifically, the standard requires that the steel surface be observed after water spraying treatment and the treatment grade and flash rust grade be determined according to the Appearance and degree of flash rust of the surface.