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LARGE BALL IMPACT RESISTANCE - ANSI NALFA LF01:2008 (3.5) (adapted)

1. TOOLS
1.1Impact apparatus

1.2 Overhead white fluorescent lights with bulb(s) parallel to the line of sight and providing an intensity of 800 to 1100 Lux on the specimen surface
1.3 Polished stainless steel ball (38.1 mm in diameter and 224 +/-3 gr.)
1.4 Clamping jig to test the test specimen flat
1.5 Manufacturer’s underlayment or underlayment foam as a closed-cell foam with a thickness of 2+/- 0.5 mm and a density of 35+/- 5 Kg/m3
1.6 Black, water washable marking pen (suitable for overhead transparencies)
1.7 A clean, damp, soft, white cloth

2. SAMPLING
1  300 x 300 mm sample (with a joint if needed)

3. ENVIRONMENTAL CONDITIONS
The samples shall be stabilized to a constant mass in a 23+/-3 ˚C and 50+/-5% relative humidity environment, and then tested in the same environment

4. TESTING PROCEDURE
4.1 Place the sample on underlayment foam of similar size as the sample
4.2 Loosely clamp the sample and the underlayment the jig


4.3 Drop the ball from any arbitrary height above the sample, making sure the ball only impacts once on the sample surface
4.4 Impacts shall be at a minimum 50 mm apart and 50 mm from any edge of the specimen
4.5 Use the marking pen to ink over impact points. Use the cloth to wipe each impact point. Fractures may appear as hairline cracks, concentric circles, or chips

4.6 Examine the impact spot for cracks or fractures

4.7 Raise or lower the drop height as necessary and repeat steps 4.4-4.6 until the maximum height at which no fractures occur is determined
4.8 Drop the ball from the height determined in 4.7 two additional times in two different locations of the sample. If any of these drops fails, reduce the height by 25 mm and continue testing until a total of three successful results has been obtainer at the same height

5. ASSESSING TEST RESULTS

  • Residential  >800 mm
  • Light commercial  >1000 mm
  • Commercial  >1200 mm
  • Heavy commercial  >1400 mm

Passing requirement per the sales contract


 
  
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