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 4061.3

March 22, 2001

DRYING TIME

1. SCOPE

1.1 Scope. This method determines the various stages and rates of film formation in the drying or

curing of organic coatings normally used under conditions of ambient room temperature.

2. APPARATUS. Not applicable.

3. REAGENTS

3.1 Reagents. None.

4. REQUIREMENTS

4.1 Film thickness and manner of drying.

4.1.1 Thickness of dried film. The film thickness used shall be stated in the product specification.

If the specification does not give this information, table I shall be used.

TABLE I. Dry film thickness.

Dry Film

Test

(thickness, mils)

Notes

Material

1.2 � 0.2

Clear coatings

1.2 � 0.2

Drying oils

See 4.1. Add driers a minimum

of 24 hours before test.

1.0 � 0.1

Varnishes

1.0 � 0.1

Lacquers

1.0 � 0.1

Resin solutions

1.2 � 0.2

Enamels

1.8 � 0.2

Oil-based paints

See 4.1.

1.2 � 0.2

Water-thinned paints

See 4.1.

1.2 � 0.2

Rubber-based paints

1.2 � 0.2

New synthetics

4.2 Air-drying.

4.2.1 Routine testing. Air-drying shall be done in a well-ventilated room or chamber free from

drafts and dust, and in diffused light (not in direct sunlight). An illumination of approximately 25

foot-candles (270 lx) is preferred for drying oil films. The temperature of the air shall be between

FED. TEST METHOD STD. 141D