FED-STD-228A
Method 8211.1
18 APRIL 2014
MOISTURE ABSORPTION, INSULATION
1. SCOPE
1.1 This method is intended for use in determining the amount of water absorbed by the insulation over a
conductor.
2. SPECIMEN
2.1 If the conductor size is No. 1 AWG or smaller, the specimen should consist of a piece of the
inspection unit 11 inch in length from which any covering over the insulation has been removed.
2.2 If the conductor is No. 0 AWG or larger, the specimen should consist of a piece of the insulation
approximately 4 inches in length, 1 inch in width, and 1/16 inch in thickness taken from the insulation of
the inspection unit. The specimen should be buffed, method 3011, to remove all corrugations and when
necessary to obtain a thickness of 1/16 inch.
3. APPARATUS AND REAGENTS
3.1 The apparatus and reagents shall be as follows:
3.1.1 Analytical balance and weights.
3.1.2 Cloth, absorbent gauze.
3.1.3 Dessiccator, vacuum.
3.1.4 Drying oven, ventilated, capable of maintaining the specimen at the required temperature within ±
2°C (4°F).
3.1.5 Mandrel with diameter of 4 times the overall diameter of the specimen to be tested (2.1).
3.1.6 Thermometer up to 100°C (212°F).
3.1.7 Vacuum pump.
3.1.8 Washers, nonferrous metal.
3.1.9 Water bath, capable of maintaining the specimen at the required temperature within ±2°C (4°F).
The bath shall consist of vitreous-enameled-steel or glass vessel equipped with a closely fitting, sheet-
metal cover plate having holes of sufficient size to accommodate the ends of the specimen. The cover
shall be of corrosion-resisting metal.
3.1.10 Calcium chloride, anhydrous, for desiccant.
3.1.11 Distilled water.
3.1.12 Ethyl alcohol, 95 percent.
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