FED-STD-228A
Method 1051.1
18 April 2014
THICKNESS, VARNISHED CLOTH
1. SCOPE
1.1 This method is intended for use in determining the thickness of varnished cloth.
2. SPECIMEN
2.1 The specimen should be a piece of the varnished cloth at least 12 inches in length taken from a
single tape layer of the inspection unit.
3. APPARATUS
3.1 The apparatus should consist of a dial micrometer having a flat anvil not less than 0.25 inch in
diameter and a flat presser foot 0.25 ± 0.01 inch in diameter which exerts a total force of 3.0 ± 0.1 ounce
on the specimen, the force being applied by means of a weight. The surfaces of the anvil and presser
foot should be parallel to within 0.0001 inch. The dial should be graduated to read in mils or 0.0001 inch.
4. PROCEDURE
4.1 At least 12 inches of each tape layer shall be removed from the inspection unit. Unless otherwise
specified in the detail specification, 10 percent of the tapes but not less than five tapes shall be selected
at random for test.
4.2 The specimen shall be placed on the anvil of the dial micrometer and the presser foot lowered gently
(not dropped) until it contacts the surface of the tape. The thickness of the specimen shall be read from
the dial and the value recorded. Five measurements equally spaced along the length of the specimen
shall be made.
5. RESULTS
5.1 Unless otherwise specified in the detail specification, one specimen from each tape selected for test,
4.1, shall be measured.
5.2 The average thickness of the tape shall be the average of the five measurements made on the
specimen tested.
5.3 The minimum thickness of the tape shall be the smallest of all values averaged in determining the
average thickness, 5.2.
5.4 The maximum thickness of the tape shall be the largest of all values averaged in determining the
average thickness, 5.2.
5.5 The average, minimum, and maximum thicknesses of each tape tested shall be recorded to the
nearest mil or 0.0001 inch.
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