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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 2131.2
March 22, 2001
APPLICATION OF SPRAYED FILMS
1. SCOPE
1.1 Scope. This method covers procedures for both the manual and automatic application of
finishing materials by using spraying apparatus.
2. APPARATUS. Not applicable.
3. REAGENTS. Not applicable.
4. PROCEDURE
4.1 Manual application.
4.1.1 Cold spray.
4.1.1.1 Reduction of material. When dilution is necessary, the material shall be reduced with the
specified thinner to the required solids content or viscosity. Where no viscosity is specified, spray-
outs performed with standard type guns shall be done at a viscosity of 17 to 25 seconds in a No. 4
Ford cup at 25°C (see ASTM D1200) for pigmented materials, and 0.65 to 1.00 stokes at 25°C
(see ASTM D1545) for clear materials.
4.1.1.2 Application. The air pressure shall be kept constant and the air line provided with a
moisture trap. The flow, gun distance from the test panel, and spray pattern shall be so adjusted that
the deposited film is kept smooth, level, and wet. Application shall be made so as to produce a dry
film thickness of (a) 0.0008 to 0.0011 or (b) 0.003 ± 0.0003 inch depending on the nature of
material applied or the number of coats and thickness specified in the product specification.
4.1.2 Hot spray.
4.1.2.1 Application. The packaged material shall be applied with an approved hot spray unit.
When dilution is necessary, the material shall be reduced with the specified thinner to the required
viscosity for hot spray application. The conditions of operation with respect to temperature of
heating unit, at spray gun, and of atomization air; pressure of atomization air and feed tank; type
and adjustment of air cap and fluid tip on spray gun; distance of gun from work; and rate of flow of
material at spray nozzle shall be as specified.
4.2. Automatic application.
4.2.1 Spray. Any automatic spraying machine that combines reciprocating rectilinear motion with
variable speed controls and means of adjusting distance from spray gun to test specimen shall be
used. The speed of the traversing mechanism and the distance from the spray gun to the test
specimen shall be varied until satisfactory spraying properties and the specified dry film thickness
are obtained. There shall be no change in operating conditions after correct settings have been
FED. TEST METHOD STD. 141D
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