FED-STD-228A
Method 8131.1
18 APRIL 2014
COVERAGE, WRAP OR SERVING
1. SCOPE
1.1 This method is intended for use in determining the coverage of a cotton serving or wrap covering on
insulated wire or cable.
2. SPECIMEN
2.1 The specimen should be a piece of the inspection unit of sufficient length to include at least 20
square inches of the wrap or serving from which any covering over the wrap or serving has been
removed. (See methods required in 4.)
3. APPARATUS AND REAGENTS
3.1 The apparatus and reagents shall be as described in the methods reference in 4.
4. PROCEDURE
4.1 The length of lay of the serving or wrap shall be determined as described in method 1531 and the
value recorded as L.
4.2 The angle of the serving shall be determined as described in method 1621 and the value recorded as
A.
4.3 The total number of ends of yarn in the specimen shall be determined as described in method 8031
and the value recorded as N.
4.4 The yarn size shall be determined as described in method 8041 and the value recorded. The
constant D for yarn size is given in table I.
4.5 If two wraps or servings are present, each shall be tested separately.
TABLE I
Size of yarn
Value of D
14/1 or 30/2
0.0096
12/1 or 26/2
.0105
10/1 or 20/2
.0114
12/2
.0155
5. RESULTS
5.1 Calculation. The coverage of the cotton wraps or servings of the specimen shall be calculated as
follows:
Coverage of serving or wrap, percent = N D x 100
W
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