Significance and Use

As the brush drag of a paint increases, any natural tendency on the part of the painter to overspread the paint is reduced. When all other factors are held constant, increased brush drag will result in greater film thickness with consequent improvement in durability and hiding. Conversely, sometimes it might be preferred to have a lesser degree of brush drag for easier application (that is, the amount of time and effort in applying a paint to a specific area is reduced with a lesser degree of brush drag).

This test method provides a standardized brushout procedure for the evaluation of brush drag as an alternative to customary informal ad hoc procedures. Its objective is to maximize the reliability and precision with which this characteristic may be determined.

Note 1The brush drag of paints is directly related to their high-shear viscosity. There is generally good rank order agreement between results obtained by this method and Test Method D4287 . The sensitivity of this brushout method has been found sufficient to distinguish between brushabilities corresponding to high-shear viscosity differences not lower than 0.3 poise (0.03 Pa.s). Round robin data show that rank order agreement between the brushout and viscometric methods is poor when latex and solvent-borne paints are part of the same comparison group. This is the result of these two paint types having markedly different rheological properties that affect the relative perception of brush drag.

1. Scope

1.1 This test method is a standardized brushout procedure for comparing the brush drag of architectural type solvent-borne paints.

1.2 With slight modifications this test method is also applicable to solvent-borne paints.

1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

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

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D1475 Test Method For Density of Liquid Coatings, Inks, and Related Products

D3924 Specification for Environment for Conditioning and Testing Paint, Varnish, Lacquer, and Related Materials

D3925 Practice for Sampling Liquid Paints and Related Pigmented Coatings

D4287 Test Method for High-Shear Viscosity Using a Cone/Plate Viscometer

D5068 Practice for Preparation of Paint Brushes for Evaluation

Keywords

brushability; brush drag; drag ; ease of brushing; high shear viscosity; Brush drag; Drag; Durability--paints/related materials; Ease of brushing; Hiding power--paints/coatings; High shear conditions; Latex paints; Viscosity--paints/related coatings/materials ;

ICS Code

ICS Number Code 87.040 (Paints and varnishes)

DOI: 10.1520/D4958-10

ASTM International is a member of CrossRef.

ASTM D4958