Hardness Test

1. NOTE:

   
   N97279-UN-13APR12

   A - Granule

   B - Hardness Tester

   C - Hardness Tester, Open End

   Only use granules of equal size when comparing data. Crushing strength increases with particle size.

   Place individual granule (A) on hard surface.

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2. Place hardness tester (B) over granule, open end (C) flush with surface.

3. 
   N97277-UN-13APR12

   A - Hardness Tester

   With one hand on handle, press tester (A) down until granule breaks.

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4. 
   N97278-UN-13APR12

   A - Marker

   B - Indicator Mark “3”

   C - Indicator Mark “4”

   Release handle and note where marker (A) rests on number scale. This is the granule crushing strength.

   For example, the marker is between 3 (B) and 4 (C) on the scale. Thus, the crushing strength is 3.5.

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