FED-STD-228A
Method 8221.1
18 APRIL 2014
MOISTURE ABSORPTION, FIBROUS COVERING
1. SCOPE
1.1 This method is intended for use in determining the amount of water absorbed by the fibrous covering
other than tapes over the insulation of a wire or cable.
2. SPECIMEN
2.1 The specimen should consist of a piece of the inspection unit 24 ± ¼ inch in length from which any
covering over the fibrous covering to be tested has been removed.
3. APPARATUS AND REAGENTS
3.1 The apparatus and reagents shall be as follows:
3.1.1 A desiccator.
3.1.2 Analytical balance and weight.
3.1.3 Water bath equipped with a cover to keep out dust and dirt and capable of maintaining the
specimen at the required temperature within ± 1°C (2°F).
3.1.4 Mandrel of the size required in table I.
TABLE I. Mandrel sizes. 1/
Size of wire, AWG, or circular
Diameter of Size of wire, AWG, or circular Diameter of
mil area
mandrel
mil area
mandrel
(inches)
(inches)
No. 14
1 3/8 450,000 cir. mils
6 5/8
No. 12
1 9/16 500,000 cir. mils
6¾
No. 10
1 5/8 550,000 cir. mils
10 ½
No. 8
1 ¾ 600,000 cir. mils
11
No. 6
1 ¼ 650,000 cir. mils
11 ¼
No. 4
1 3/8 700,000 cir. mils
11 ½
No. 2
1 9/16 750,000 cir. mils
12
No. 1
2 1/16 800,000 cir. mils
12 ¼
No. 0
2 7/8 850,000 cir. mils
12 ½
No. 00
3 900,000 cir. mils
12 7/8
No. 000
3 ¼ 950,000 cir. mils
13 ¼
No. 0000
3 ½ 1,000,000 cir. mils
13 ½
250,000 cir. mils
5 13/16 1,250,000 cir. mils
17 ½
300,000 cir mils
5 ½ 1,500,000 cir. mils
18 ½
350,000 cir mils
5 7/8 1,750,000 cir. mils
19 ¾
400,000 cir mils
6 ¼ 2,000,000 cir. mils
20 ½
1/ The values for mandrel diameter in the table apply throughout to insulated conductors having two
fibrous coverings. For Nos. 14, 12, 10, and 8 AWG conductors having one fibrous covering, the mandrel
diameters are to be 5/16, 3/8, 9/16 and 11/16 inch, respectively.
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