FED-STD-228A
Method 8231.1
18 APRIL 2014
INSULATION SHRINKAGE (MOLTEN SOLDER METHOD)
1. SCOPE
1.1 This method is intended for use in determining the amount of insulation shrinkage or a wire.
2. SPECIMEN
2.1 The specimen should be a 6-inch length of insulated wire.
3. APPARATUS
3.1 The apparatus shall be as follows:
3.1.1 A suitable container in which the solder may be kept.
3.1.2 Mandrels of the size specified in 4.1.
4. PROCEDURE
4.1 Before the addition of any outer coverings, a 6-inch specimen of insulated wire shall be taken from a
point at least six inches from the end of an inspection unit and shall be prepared for testing by removing
½-inch of insulation at one end. At a point ½-inch from the skinned end of the wire, the specimen shall be
given a 90° bend over a mandrel of its own diameter. The end shall then be immersed for 5 seconds, to
within 1/8 inch of the insulation in a container of lead free solder maintained at a temperature of
approximately 320°C (608°F). There shall be no flux used in preparing the wire for soldering. The
insulation shall not flare away from the conductor, open up over the bent portion, nor shrink back more
than that specified in the detail specification or specification sheet.
5. RESULTS
5.1 Unless otherwise specified in the detail specification or specification sheet, one specimen from each
inspection unit shall be tested.
5.2 The amount of shrinkage shall be recorded.
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