ASTM D4941-2021 Preparation of Paste Pigments for Painters

Meaning and Purpose
5.1 Quality standards for artist paints require the assessment of various appearance characteristics of the paint film. The determination of colouration strength (test method D4838) specifically requires preparation of the drafting for colorimetric measurements. Other evaluations, such as color designation, transparency, gloss, and chromatic aberration measurements, also require a retracted sample.

5.2 Artists’ tube paints have a pasty consistency, which makes it difficult to use traditional methods of film application, especially for dry oil paints.

5.3 The artist’s pigments differ in two attributes that are important for film preparation, namely transparency and drying time. Colorimetric determination and some other types of evaluation require paint specimens that completely conceal the substrate. Very transparent coatings require such a thick film to produce a complete masking effect that the drying time is too long or the surface of the specimen is defective. When complete concealment is required, this practice aims to provide opaque films without these defects by applying a series of films.

ASTM D4941-2021 Preparation of Paste Pigments for Painters

Scope of
1.1 This practice includes the production of homogeneous films of artist tube paint and other non-flowing pigment coatings using paint coaters designed for low-viscosity coatings.

1.2 Includes information on how to obtain opaque specimens from these coatings.

1.3 Values expressed in SI units shall be regarded as standards. The values given in parentheses are for reference only.

1.4 This standard is not intended to address all safety issues, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health and environmental practices and to determine the applicability of regulatory restrictions prior to use.

1.5 This international Standard has been developed in accordance with the internationally recognized standardization principles established in the Decision on Principles for the Development of International Standards, Guidelines and Recommendations issued by the Committee on Technical Barriers to Trade of the World Trade Organization.

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