Cold Bend Test Apparatus conforms to the standard requirements of IEC540. It is used for cold bend test of the circular insulation wire core whose diameter is small and the sector-shaped insulation wire core which cannot be used for dumbbell. The apparatus shall be held in a refrigerator before and during the test. The diameter of the mandrel shall be between 4 and 5 times the diameter of the test piece (see below).The mandrel shall be uniformly rotated at a rate of one revolution in about 5 s and the number of turns shall be as specified in the following table.
Technical Parameters
| Overall diameter (d) of the test piece (mm) | Number of turns |
| d≤2.5 | 10 |
| 2.5＜d≤4.5 | 6 |
| 4.5＜d≤6.5 | 4 |
| 6.5＜d≤8.5 | 3 |
| 8.5＜d | 2 |
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