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Home > Quality Control > Lab Testing > Vinyl Flooring
  
  
  
  

CURLING AFTER EXPOSURE TO HEAT EN 434:1994 (adapted)

1. TOOLS
1.1 Thermostatically-controlled ventilation oven
1.2 Solid metal support plates, ground and covered with a film of polytetrafluoroethylene
1.3 Vernier caliper accurate to 0.01 mm

2. SAMPLING
3*250x250 mm where the machine and across machine directions are clearly marked. The distance between the outer edge of the plank and the nearest edge of the sample should be at least 100 mm

3. ENVIRONMENTAL CONDITIONS
Condition the samples for 24 hours at 23(+/-1)℃ and 50(+/-5)% relative humidity. Perform the test under the same environmental conditions

4. TESTING PROCEDURE
4.1 Place the samples face up on the plates. If present, measure the initial curling in 4 places around the edge (usually the corners) before carrying out the test

4.2 Place the plates into the oven at 80 (+/-2 C) for 360 (+15) min (the oven should have been previously stabilized)

4.3 Take the exposure plates with the samples on top out of the oven and let them recondition for 24 hours

4.4 Remeasure the maximum vertical distances on each edge (usually at the corners)

4.5 Reduce each of the actual measurements by the mean thickness of the floor covering. Calculate the mean value of the four differences for each test piece and then mean value for the three test pieces. Express the results in mm to the nearest 0.5 mm

5. ASSESSING TEST RESULTS
Max. 2 mm



 
  
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