THICKNESS EXPANSION - GB/T18102-2007 (6.3.4) (adapted)

1. TOOLS
1.1 Constant temperature water tank
1.2 Micrometer

2. SAMPLING
2*150x50 mm

3. ENVIRONMENTAL CONDITIONS
Water temperature: 20 (+/-1)℃

4. TESTING PROCEDURE
4.1 Measure each sample’s thickness at 6 points (see below)

4.2 Immerse the samples into the water tank for 24 hours+/-15 minutes



4.3 Take the samples out of the water tank and dry them with a cloth



4.4 Within maximum 30 minutes of drying, measure the thickness at the same original 6 points



4.5 Calculate average thickness swelling: D=((h2-h1)/h1)*100

D – Average thickness coefficient
H1 – 6 point average thickness prior to inmersion
H2 – 6 point average thickness after inmersion

5. ASSESSING TEST RESULTS
Passing requirement: average thickness swelling ≤ 18%