ASTM D3258-04(2019)

Die Annotation des Normtextes ASTM D3258-04(2019) :

This test method details the standard procedure for determining the porosity of white or near white mineral spirits insoluble paint film by staining to indicate the degree to which a subsequent coat will penetrate. This test method shall require the use of film applicators, reflectometer, vacuum drawdown plate, camelhair brush, plastic wash bottle, test panel, penetrating medium, and filter paper. The test paint is applied to a nonporous surface, air dried, then measured for reflectance. A special colored penetrating medium is applied, the excess removed in a specified manner, and reflectance measured again. The difference between the two readings indicates the degree of porosity; the smaller the difference, the lower the porosity of the film and the greater its ability to resist penetration.


Keywords:
film porosity, porosity, resistance´penetration (into paint films),, ICS Number Code 87.040 (Paints and varnishes)