FED-STD-228A
Method 4221.1
18 APRIL 2014
RESISTANCE TO OIL, INSULATION AND SHEATH
1. SCOPE
1.1 This method is intended for use in determining the effect of oil on oil-resisting insulation and sheath
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 immediately after exposure
of the material.
2. SPECIMEN
2.1 The specimen should be as described in methods 3021 and 3031 or other methods of test required
for determining the amount of deterioration, 4.2.
3. APPARATUS AND REAGENTS
3.1 The apparatus and reagents shall be as follows:
3.1.1 Glass tube having an outside diameter of 38 mm. and a length of approximately 300 mm. or other
suitable container for immersing the specimen in oil.
3.1.2 Reflux condenser suitable for fitting into the glass tube by means of a cork stopper.
3.1.3 Equipment for controlling the temperature within ±1°C (2°F), such as a constant temperature liquid
bath with thermostatic control.
3.1.4 Thermometer.
3.1.5 Aluminum or corrosion-resisting steel screens or glass frame-work to prevent the specimens from
touching each other or the surfaces of the container.
3.1.6 Filter paper.
3.1.7 Acetone.
3.1.8 Immersion oil conforming to the following requirements:
Flash point - - - - - - - - - - - - - - - - - 246° ± 5°C (475° ± 10°F)
Saybolt viscosity, sec - - - - - - - - - 100 ± 5
Aniline point - - - - - - - - - - - - - - - 93° ± 3°C (199° ± 5°F)
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 hours ± ¼ hour.
4.2 Unless otherwise specified in the detail specification, tensile strength and elongation tests, methods
3021 and 3031 shall be used to determine the deterioration of the insulation and sheath due to aging.
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