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 6304.2

March 22, 2001

KNIFE TEST

SCOPE

1.1

Scope. This method should be limited to testing the brittleness and quality to ribbon

when a film is cut with the knife. This method should not be used as a test for adhesion as

other methods are more accurate.

APPARATUS

2.1

Knife. A serviceable knife with a very sharp blade.

REAGENTS

3.1

Reagents. None.

PROCEDURE

4.1

Preparation. Apply and dry the film of the coating material to be tested as specified

in the product specification. Test for brittleness, toughness and tendency to ribbon by cutting

a narrow ribbon of the coating from the test panel with the standard knife while holding the

blade at an angle of approximately 30 degrees to the panel. Determine if the cut film

conforms to the specified requirements.

PRECISION

5.1

Data. No data.

NOTES

6.1

Notes. None.

FED. TEST METHOD STD. 141D