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ISO 5402-1 Leather Flex Resistance - Bally Flexing Test

ISO 5402-1 Leather Flex Resistance – Flexometer method – Unuo

ISO 5402-1 (IULTCS/IUP 20) is a method to test leather dry or wet flex resistance. This method will flex leather with fold for a certain cycles to check if tested leather will have damage or not.

1. Application

ISO 5402-1 is suitable for all kinds of flexible leather whose thickness is below 3mm.

2. Required Machine/Tool

  • Bally flexometer which has required grip to cause fold, counter and can continuously runs at a certain speed.
  • Magnifier
  • Desiccator
  • Vacuum pump
  • Glass dishes
  • Cutting knife

Unuo Instruments supplies all of the above machines and tools. Contact us for a price quote and more details.

3. Sample preparation

Cut sample with pneumatic sample cutter by using cutting die.

4. Dry Flex Test

Condition the samples as per required by ISO 2419 and test in lab atmosphere.

5. Wet Flex Test

Place the sample in a glass dish, then out the dish in the desiccator and reduce the pressure to below 4kPa for 2 min by using vacuum pump. Then take out to normal atmospheric pressure. Repeat the pressure reduction twice.

6. Clamp the sample

Please pay attention to this step. Clamp the sample according to standard requirement. If any question, please contact our tech dept for details.

ISO 5402-1 Bally leather flex test

7. Periodically check sample

-Dry flex: 500, 1000, 5000, 10000, 10000, 25000, 50000, 100000, 150000, 200000, 250000 cycles

-Wet flex: 500, 1000, 2500, 10000, 20000, 25000, 52000 cycles

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