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RESISTANCE TO FREEZE-THAW - GB/T 24508-2009

1. TOOLS
1.1 Freezer reaching -35℃ accurate to+/-1℃
1.2 Panel Universal Testing Machine accurate to 1N

2. SAMPLING
6*(14xthickness of sample +50 mm) xwidth of product mm. If the product width is>180 mm, the sample width should be 180 mm

3. TESTING PROCEDURE
3.1 Immerse 3 samples in water at room temperature for 24 hours

3.2 Place the samples in the freezer at -29(+/-1) ℃ for 24 hours

3.3 Take the samples out of the freezer and subject them to room temperature for 24 hours

3.4 Repeat 3.1, 3.2, 3.3 two more times, and leave the samples at room temperature for another hour
3.5 Measure the width and thickness accurate to 0.01 mm of both the 3 samples subjected to freezing and the 3 samples which were kept at room temperature



3.6 Adjust tester span to be 14x sample thickness

3.7 Input the above data and record the results of the two sets of samples (F1 for samples which have not been frozen and F2 for samples which have been subjected to freezing)



3.8 Calculate B=〔1-(F1-F2)/F1〕x100%

4. ASSESSING TEST RESULTS

Passing requirement: ≥80%



 
  
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