FED-STD-228A
Method 5111.1
18 APRIL 2014
MELT, FIBROUS COVERING
1. SCOPE
1.1 This method is intended for use in determining the softening of the saturants and finishing materials
in the fibrous covering of insulated wire and cable.
2. SPECIMEN
2.1 The specimen shall be a 6-inch length of the inspection unit from which any covering over the fibrous
covering has been removed.
3. APPARATUS
3.1 The apparatus shall be as follows:
3.1.1 A circulating air oven capable of maintaining the specimen at the required temperature within ±1°C
(2°F).
3.1.2 Means for suspending the specimen horizontally in the oven.
4. PROCEDURE
4.1 Unless otherwise specified in the detail specification, the specimen shall be subjected to a
temperature of 65° ± 1°C (149° ± 2°F) for a period of 30 minutes.
4.2 The specimen shall be wrapped, except for a distance of 1 inch at each end with a piece of clean,
white, glazed paper. The wrapped specimen shall be supported horizontally by the bare ends of the
conductor in the oven which has been pre-heated to the required temperature. The specimen shall be
heated for the required time at the required temperature, removed from the oven, and allowed to cool to
room temperature. The specimen shall be examined to determine whether the paper adheres to the
specimen or whether the saturants or finishing materials have become sufficiently fluid to be transferred
to the paper in sufficient quantity to form a ridge on the paper which is perceptible to the touch.
5. RESULTS
5.1 Unless otherwise specified in the detail specification, two specimens from each inspection unit shall
be tested.
5.2 The resistance to melting of the saturants or finishing materials of the fibrous covering of the
inspection unit shall be the results obtained from the specimens tested.
5.3 Whether the paper adhered to the inspection unit shall be recorded.
5.4 Whether the saturants or finishing materials transferred to the paper from the inspection unit shall be
recorded.
5.5 The temperature and time of exposure shall be recorded.
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