FED-STD-141 Paint, Varnish, Lacquer And Related Materials: Methods Of Inspection, Sampling And TestingThis standard elaborates the methods used to determine the physical and chemical properties of paint, varnish, lacquer, and related materials. The purpose of this standard is to establish standardized testing methodologies and to eliminate unnecessary or undesirable variations in test results when evaluating a product??s adherence to specification requirements. If any variation or modification of the methods established in this standard is required by any specification, the procedures listed in the specification will take precedence. Any conflict between this standard and any particular specification will be resolved in favor of the specification.

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METHOD 4321.3

March 22, 2001

BRUSHING PROPERTIES

1. SCOPE

1.1 Scope. This method provides a means for determining the brushing properties of coatings.

This test is quite subjective; however, someone experienced in the art can produce quite consistent

results, particularly in the determination of the "drag" properties.

2. APPARATUS

2.1 Brush. A 2-1/2-inch wall brush of good quality.

2.2 Panel. A 2 by 2 foot cold-rolled steel or aluminum panel.

3. REAGENTS

3.1 Reagents. None required.

4. PROCEDURE

4.1 Application to metal panels.

4.1.1 Panel preparation. The panel shall be solvent cleaned.

4.1.2 Application of material under test. Pre-wet the brush with the coating to be applied. The

idea is to have as much of the coating in the brush prior to beginning the test as there is at the finish

of the test. The coating shall be applied at 500 square feet per gallon unless otherwise specified.

4.2 Application to sheet rock panels.

4.2.1 Panel preparation. The panel shall be a 2 by 4-foot piece of 1/4 inch gypsum sheet rock

meeting ASTM C36. Unless otherwise specified, the panel shall be primed with an undercoater

meeting the minimum requirements of A-A-2994 (see 6.1). Allow to dry at least 24 hours prior to

applying the material under test.

4.2.2 Application of material under test. Apply the material at a spreading rate of 500 square feet

per gallon unless otherwise specified. The material shall be applied in sections, first brushing the

coating using back and forth strokes, then coming back and leveling the material by brushing to 90

degrees of the first strokes. Proceed to the next section always working to a "wet edge". Repeat this.

Place the panel in a vertical position.

4.3 Observations. Note whether the material under test brushes easily and has good flowing and

spreading qualities. After the film has dried, the surface shall be inspected for freedom of lap marks

(see 6.1). Take notice of gloss variations and obvious brush marks.

FED. TEST METHOD STD. 141D