FED-STD-228A
Method 8033.1
18 APRIL 2014
YARNS PER INCH, VARNISHED CLOTH
1. SCOPE
1.1 This method is intended for use in determining the number of ends (warp yarns) per inch and the
number of picks (filling yarns) per inch in varnished cloth used in the insulation of insulated wire and
cable.
2. SPECIMEN
2.1 The specimen should be a piece of the varnished cloth at least 6 inches in length and the full width of
the tape taken from a single tape layer of the inspection unit.
3. APPARATUS AND REAGENTS
3.1.1 A thread counter, pick glass or other suitable instrument consisting of a low power ocular mounted
on a rack and pinion over a graduated scale. The position of the ocular with respect to the scale shall be
indicated by a pointer.
3.1.2 A needle or other pointed instrument.
3.1.3 A 200-ml. beaker with cover glass.
3.1.4 Blotting paper.
3.1.5 Alcohol or other suitable solvent.
4. PROCEDURE
4.1 At least 6 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 in no case less than 5 tapes shall be
selected at random for test.
4.2 Warp yarns. Any saturants or finishing materials shall be removed from the specimen by means of
the solvent. The specimen shall then be dried by pressing it between blotting paper and laid out smoothly
on a flat surface without tension. The counting instrument shall be placed on the specimen so that the
graduated edge is at right angles to the yarns to be counted. Starting with the zero graduation of the
scale and the pointer flush with one of the ends (warp yarns), the number of ends (warp yarns) in a
distance of 1 inch of the specimen shall be counted and the value recorded. If the fabric tape is 1 inch or
less in width, all ends shall be counted and the results expressed as ends (warp yarns) per inch.
4.3 Filling yarns. The number of picks (filling yarns) per inch shall be determined as described in 4.2.
5. RESULTS
5.1 Unless otherwise specified in the detail specification, one specimen from each inspection unit shall
be tested.
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