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FLEXIBILITY (CYLINDRICAL MANDREL) –EN 435:1994 (adapted)

1. TOOLS
1.1 Mechanical convection-type oven
1.2 Mandrel (size 25.4 mm or other sizes as per clients’ request)
1.3 Mandrel support

2. SAMPLING
12*250x50 mm (6 samples parallel and 6 samples perpendicular to the plank’s length)

3. ENVIRONMENTAL CONDITIONS
Condition the samples on a flat surface for 24 hours at 23(+/-2)°C and 50(+/-5)% relative humidity

4. TESTING PROCEDURE
COLD FLEXIBILITY (6 samples)
On one parallel and one perpendicular sample:
4.1 Place the sample, face out, over the mandrel, with the major axis of the sample perpendicular to the major axis of the mandrel

4.2 Bend the sample around the mandrel at a uniform rate through a 180-degree angle while holding the sample at each end. Take 5 s to complete the bend. Maintain a good contact between the sample and the mandrel

4.3 Examine the sample face visually in the bent position for breaks, cracks, or other damage at the completion of the bending operation. Then straighten the sample at the same rate at which it was bent and examine the back for the same faults. Ignore any effects within 10 mm from the edges of the sample.



On the second parallel and on the second perpendicular sample, repeat 4.1, 4.2 and 4.3 with the sample face in (face touching the mandrel). Examine the back, while the sample is still in the bent position, for cracks, breaks or other damage. Then straighten the sample and examine the sample face



HOT FLEXIBILITY (6 samples)
The remaining 6 samples should be kept in the oven at 82 (+/-2 °C) for 60 minutes before performing the above tests

5. ASSESSING TEST RESULTS
Neither face nor back may exhibit breaks, cracks, or other permanent damage



 
  
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