Test means

We own a perfect quality test laboratory equipped with all necessary routine test apparatuses and instruments. Our test methods and standards are the same with many important customers.
      Routine test items include:
      gangue content
      free iron content
      grain size distribution (negative-pressure screening, wet testing, slap screening, laser grain size testing)
      whiteness
      bulk density
      moisture content...

Laser particle size analyzer curve as shown below