FED-STD-228 Test Methods For Cables And Wire, InsulatedThis method is intended for use in determining the thickness of the insulation of insulated wire and cable. It is not recommended for use when the thickness of the insulation is less than 3/64 inch.

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FED-STD-228A

Method 3111.1

18 APRIL 2014

TEARING STRENGTH, SHEATH

1. SCOPE

1.1 This method is intended for use in determining the resistance to tear of sheath compounds. It is

applicable to the usual grades of rubber and thermoplastic compounds used for sheaths.

2. SPECIMEN

2.1 The specimen should be a piece of the sheath taken from the inspection unit of the shape and

dimensions shown in figure 3111. The thickness at the enlarged end of the specimen should be not

greater than 0.150 inch and not less than 0.040 inch.

3. APPARATUS

3.1 The apparatus shall be as follows:

3.1.1 Apparatus as described in method 3021.

3.1.2 Sharp razor blade for slitting the specimen.

.5"

.25"

.15"

Figure 3111

4. PROCEDURE

4.1 Preparation of specimen.

4.1.1 Buffing. If the piece from which the specimen is to be prepared is too thick or has an uneven

surface that may interfere with the determination of thickness, the piece or portion of the piece shall be

buffed as described in method 3011.