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This document specifies the testing method for evaluating the formaldehyde purification performance of interior wall coatings using the bag method, which mainly includes principles, apparatus, reagents and materials, experimental system validation, formaldehyde concentration analysis, sampling, standard test conditions, test procedures, precision, and test reports. This document is applicable to the measurement and evaluation of formaldehyde purification performance of various types of interior wall coatings. Other indoor decoration materials with formaldehyde purification performance, such as wallpaper, carpets, decorative panels, etc., can also refer to this document. Acetaldehyde, propionaldehyde, butyraldehyde, valeraldehyde, isovaleraldehyde, capronaldehyde, benzaldehyde, 2,5-dimethylbenzaldehyde, o-tolualdehyde, m-tolualdehyde, p-tolualdehyde and other carbonyl compounds can also refer to this document.