FED-STD-228A
Method 3161.1
18 APRIL 2014
TENSION SET, INSULATION AND SHEATH
1. SCOPE
1.1 This method is intended for use in determining the elongation remaining in rubber insulation and
sheath compounds after a specimen has been held at a specified elongation for a given period of time,
then relieved of the force and allowed to rest for a definite period of time.
2. SPECIMEN
2.1 The specimen should be as described in method 3021.
3. APPARATUS
3.1 The apparatus shall be as follows:
3.1.1 Grips as used in the testing machine described in method 3021.
3.1.2 Any satisfactory device for stretching the specimen at a uniform speed and which will hold it at a
specified elongation for a definite period of time. An apparatus that has been found satisfactory is shown
on figure 3161.
3.1.3 Stop watch or other suitable timing device which will register the time in seconds and minutes.
3.1.4 Measuring scale or other device graduated in 0.01 inch for indicating the elongation or set. A
straight rod of a length equal to the exact distance required between the bench marks after stretching has
been found suitable for determining the required elongation.
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