FED-STD-228A
Method 2231.1
18 APRIL 2014
INSULATION STRIPPABILITY
1. Scope.
1.1 This method is intended for use in determining the strippability (adhesion between insulation and
conductor) of insulated conductors.
2. Specimen.
2.1 The specimen shall be free of splices, surface cracks, or other visible defects and shall be prepared
as shown on figure 1. Preparation shall be done carefully.
3. Apparatus.
3.1 The apparatus shall consist of a tensile tester and a test fixture such as shown on figure 2.
4. Procedure.
4.1 The adhesion to conductors test shall be performed with a tensile tester and a test fixture such as
shown on figure 2. The diameter of the hole in the test plate shall be 0.004 ±1.001 inch larger than the
diameter of the applicable conductor. The conductor extending through the test plate hole shall be pulled
with a constant rate of 0.2 - 0.5 inch per minute. Avoid sudden pulls and jerking. Conductor adhesion
shall be defined as the highest tensile tester reading obtained when the conductor - to-insulation bond is
broken. In performing this test, physical handling of the specimen shall be kept to a minimum to avoid
specimen degradation.
5. Results
5.1 The adhesion to conductor (strippability) requirement, as noted by the reading on the tensile tester,
shall meet the specified value.
5.2 Where the insulation is stripped, there shall be no evidence of conductor damage and only a trace of
insulation or adhesive remaining which can be easily removed by peeling.
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