Cold Bend
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UL 1581-580
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Scope:
Cold bend measures a materials resistance to cracking when being bent in a cold environment. It is often used to evaluate plastics insulation on electrical wires.
Test Procedure:
Specimens are placed in a cold chamber for four hours. The specimens are then wound six times around different mandrels having specified diameters. The rate of winding is about three seconds per turn. The specimens are then examined for cracks.
Specimen size:
The test often uses insulated wire. Enough wire is needed to wrap around the mandrels six times.
Data:
Cracking is noted at various diameters of mandrels.
Equipment Used:
Freezer
Mandrels
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