Howard Industries Inc.

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Particle Size Conversion Chart

US Mesh                                                  Micron

     4                                                           4760

     8                                                           2380

    10                                                          1680

    14                                                          1410

    20                                                            841

    30                                                            595

    40                                                            420

    60                                                            250

    80                                                            177

   100                                                           149

   120                                                           125

   140                                                           105

   170                                                             88

   200                                                             74

   230                                                             63

   270                                                             53

   325                                                             44

   400                                                             37

   625                                                             20

   1250                                                           10