FED-STD-228A
Method 8041.1
18 APRIL 2014
YARN SIZE, WRAP AND SERVING
1. SCOPE
1.1 This method is intended for use in determining the size of cotton yarn in cotton wraps or cotton
servings of insulated wire and cable.
2. SPECIMEN
2.1 The specimen should be a piece of the covering at least 20 square inches in area taken from the
inspection unit in the form of a continuous ribbon, unbroken except for binder threads.
3. APPARATUS AND REAGENTS
3.1 The apparatus and reagents shall be as follows:
3.1.1 Soxhlet extraction apparatus.
3.1.2 Oven maintained at 70° ± 2°C (158° ± 4°F).
3.1.3 Analytical balance and weights.
3.1.4 Steel scale graduated to 1/32 inch or finer or its decimal equivalent.
3.1.5 Scissors.
3.1.6 Alcohol or other suitable solvent.
4. PROCEDURE
4.1 The ends of the specimen shall be cut square, the length measured with a steel scale to the nearest
1/32 inch and the value recorded as L. The specimen shall be folded and transferred to an extraction
apparatus.
4.2 The specimen shall be extracted with the solvent until all the saturants and finishing materials have
been removed. The extraction is complete when the solvent from the siphon tube is clear. The specimen
shall then be removed from the extraction apparatus and dried to a constant weight in the oven at 70° ±
2°C (158° ± 4°F). The binder threads shall be removed from the specimen, the total number of ends of
yarns counted and the value recorded as N.
4.3 The specimen shall be conditioned for 1 hour at 65 ± 2 percent relative humidity and temperature of
70° ± 2°C (158° ± 4°F), weighed and the value recorded as W.
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