The test method details a standard procedure for determining the porosity of white or near-white mineral oil insoluble paint films by staining to indicate the degree of penetration of subsequent coatings. This test method shall require the use of a film applicator, reflectometer, vacuum extraction plate, camel hair brush, plastic washing bottle, test plate, penetration medium and filter paper. The test paint was applied to a non-porous surface, air dried, and then the reflectivity was measured. A special colored penetrating medium was applied to remove the excess in the specified manner and the reflectivity was measured again. The difference between two readings indicates porosity; The smaller the difference is, the lower the porosity of the film is and the stronger the resistance to penetration is.

ASTM D3258-2019 Porosity of Paint Film Abstract

の範囲
1.1 The test method covers the determination of the porosity of white or near-white mineral oil insoluble paint films to indicate the degree of penetration of subsequent coatings.

1.2 The texture of the film will affect the cleaning and thus the test results. A stain applied to a high shading paint does not reduce the reflectivity as much as the same stain applied to a low shading paint with equal porosity. These points need to be considered when comparing different paints.

1.3 SI単位で表した値を基準とします。. 括弧内の値は参考値です。.

ASTM D3258-2019 Porosity of Paint Film Abstract

1.4 この規格は、すべての安全問題に対処することを目的としたものではありません, もしあれば, その使用に関連する. 適切な安全性を確立するのは、この規格の使用者の責任です。, 健康および環境慣行を確認し、使用前に規制制限の適用可能性を判断するため.

1.5 この国際規格は、国際規格開発の原則に関する決定で確立された国際的に認められた標準化原則に従って開発されました。, 世界貿易機関の貿易の技術的障壁に関する委員会が発行したガイドラインと勧告.