FED-STD-228A
Method 4223.1
18 APRIL 2014
RESISTANCE TO OIL, INSULATION AND SHEATH (RECOVERY METHOD)
1. SCOPE
1.1 This method is intended for use in determining the effect of oil on oil-resisting insulation and sheath
of insulated wire and cable. The procedure may be used for determining the resistance of insulation and
sheath to oil at any desired temperature. The tensile strength, elongation, or other characteristic used for
determining the degree of deterioration is determined after the material has been permitted to recover for
a definite period of time after exposure to the oil.
2. SPECIMEN
2.1 The specimen should be as described in method 4221.
3. APPARATUS AND REAGENTS
3.1 The apparatus and reagents shall be as described in method 4221.
4. PROCEDURE
4.1 Unless otherwise specified in the detail specification, the test shall be carried out at a temperature of
121° ± 1°C (250° ± 2°F) for a period of 18 ± ¼ hour.
4.2 Unless otherwise specified in the detail specification, tensile strength and elongation tests, method
3021 and 3031 respectively, shall be used to determine the deterioration of the insulation and sheath due
to aging.
4.3 Unless otherwise specified in the detail specification, the specimen shall be permitted to recover 4 ½
± ¼ hour in the air at room temperature after exposure to the oil before determining the tensile strength
and elongation or other characteristics.
4.4 After adjusting the immersion oil to the required temperature, the specimen shall be completely
immersed so that the liquid can circulate freely around the specimen during the period of exposure. The
immersion container shall be fitted with a reflux condenser and the specimen exposed for the required
time at the specified temperature.
4.5 At the end of the immersion period the specimen shall be removed from the liquid, placed
immediately in a fresh supply of the same liquid at room temperature, and allowed to remain for 35 ± 5
minutes.
4.6 At the end of the cooling period in the fresh liquid the specimen shall be removed from the liquid,
quickly dipped into acetone, and blotted lightly with filter paper. The specimen shall be suspended in air
and allowed to recover for the required period of time (see 4.3) before tests are made.
4.7 At the end of the recovery period the width, thickness, and cross-sectional area of the specimen shall
be determined as follows:
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