FED-STD-228A
Method 4211.1
18 APRIL 2014
RESISTANCE TO PETROLATUM, VARNISHED CLOTH
1. SCOPE
1.1 This method is intended for use in determining the effect of hot petrolatum on varnished cloth and
tapes of insulated wire and cable.
2. SPECIMEN
2.1 The specimen should be a piece of the varnished cloth or tape at least 12 inches in length taken from
a single tape layer of the inspection unit.
3. APPARATUS
3.1 The apparatus shall be as follows:
3.1.1 A 200-milliliter beaker and cover glass.
3.1.2 An air oven equipped with an automatic temperature control capable of maintaining the specimen
at the required temperature within ± 1°C (2°F).
3.1.3 Thermometer with scale to at least 160°C (320°F) and graduated to 0.5°C (1°F).
3.1.4 Petrolatum, approximately 100 ml.
4. PROCEDURE
4.1 At least 12 inches of each tape shall be removed from the inspection unit. Unless otherwise
specified in the detail specification, 10 percent of the tapes but in no case less than 5 tapes shall be taken
at random for test.
4.2 Unless otherwise specified in the detail specification, the temperature of exposure shall be 150° ±
1°C (302° ± 2°F) for a period of 15 ± 1 minute.
4.3 The 200-ml. beaker containing the petrolatum shall be heated to the required temperature. After the
beaker and petroleum have reached the required temperature, the specimen shall be completely
immersed in the petrolatum and allowed to remain for the required time. At the end of the exposure
period the specimen shall be removed from the petrolatum and set aside to cool to the room temperature.
The specimen shall then be freed of any petrolatum with a cloth and examined for softening, tackiness, or
brittleness of the varnish.
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