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VARNISH IMPACT RESISTANCE - EN13696:2009 (7) (adapted)

1. TOOLS
1.1 Free-ball apparatus
1.2 Polished stainless steel ball having no damaged or flattened surface, 224 (+/-3) g, ∮38.1 mm
1.3 Polyethylene foam, thickness 2 (+/-0.5) mm, density 35 (+/-5) kg/m3

2. SAMPLING
5*300x300 mm

3. ENVIRONMENTAL CONDITIONS
Temperature: 23(+/-2) ° C 
Humidity: 50 (+/-5)%

4. TESTING PROCEDURE
4.1 Place the polyethylene foam onto the base
4.2 Place the sample onto the foam



4.3 Clamp the sample (and polyethylene foam) onto the base



4.4 Turn on the switch



4.5 Steel ball impacts onto the sample (minimum distance with the sample edge should be 50 mm)
4.6 Repeat 4.5 from different distances until the maximum height at which no fracture occurs is determined. Fracture can be a hairline crack, a concentric circle or a chip
4.7 Drop the ball from the height determined in step 4.6 two additional times in different locations on the sample. If any of these drops fails, reduce the height by 25 mm and continue testing until a total of 3 successful results has been obtained at the same height



4.8 Repeat the preceding with the other 4 samples. The final result will be the average value of the 5 samples

5. ASSESSING TEST RESULTS
Per the contract







 
  
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