FED-STD-228A
Method 7123.1
18 APRIL 2014
CONDUCTOR COATING, AMMONIUM PERSULFATE
1. SCOPE
1.1 This method is intended for use in determining the uniformity of the coating on copper conductors of
insulated wire and cable. It is applicable to lead- and lead-alloy-coated copper. For determining the
uniformity of lead or lead-alloy coatings this method gives more conclusive results than method 7121 and
it should be used in case of dispute when these two coatings are involved.
2. SPECIMEN
2.1 The specimen should be the conductor removed from the inspection unit. The length of the
specimen should be determined by substituting the appropriate value of K, given in table I, in the formula:
L=K/D, where L is the length in inches of the specimen and D is the diameter in inch of the coated
conductor.
TABLE I
Wire diameter (inch)
K
0.400 0.321 - - - - - - - - -
1.2
0.320 0.161 - - - - - - - - -
0.8
0.160 0.0810 - - - - - - - -
.4
0.0800 0.0400 - - - - - - -
.2
0.0390 0.0830 - - - - - - -
.1
3. APPARATUS AND REAGENTS
3.1 The apparatus and reagents shall be as follows:
3.1.1 Glass container of sufficient size for immersion of the specimen.
3.1.2 White paper.
3.1.3 Ammonium persulfate solution.
3.1.4 Reference color standard solution.
4. PROCEDURE
4.1 Preparation of test solutions. The test solutions, 3.1.3 and 3.1.4 shall be prepared as follows:
4.1.1 Ammonium persulfate solution. The ammonium persulfate solution shall be prepared by dissolving
10 grams of c.p. ammonium persulfate crystals in 500 ml. of distilled water, adding 75 ml. of ammonium
hydroxide, sp. gr. 0. 90, and diluting to 1 liter with distilled water. The ammonium persulfate crystals shall
contain not less than 95 percent ammonium persulfate. The solution shall be freshly prepared each day
and shall not be subjected to temperatures above 38°C (100°F).
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