TEXT: By: Kevin Dockery copyright 1999
  ARMOR (SWORD OF JUSTICE)
    
    The following chart lists various thicknesses of materials 
  according to an armor equivalent (armor class) that allows the 
  penetration of a round to be measured against it. To use the 
  chart the armor class is found for the type and thickness of 
  material that is being penetrated. the armor class is subtracted 
  from the rounds penetration, if there is a positive number 
  remaining the round penetrated the material and the target 
  receives the appropriate damage. If after the subtraction of the 
  armor class from the penetration the number remaining is negative
  or zero,  the projectile was stopped by the armor and the target 
  received no damage.
                                  INCHES OF  INCHES OF
  ARMOR  INCHES OF   INCHES OF     REINF.    CEMENT OR
  CLASS    STEEL        WOOD      CONCRETE     STONE
  5          -            2           .2         -                 
  10         .133         4           .4         3
  15         .2           6           .6         -
  20         .25          8           -          - .25 in 
  fiberglass
  25         .3          10          1.5         6.5
  35        -           -          -         -   22 Layer  Kevlar 
  vest
  40         -            -           -          -   3/4 in Lexan
  50         .5          18          4          12
  75         .7          26          7.5        17
  100        -           35         11.5        22
  105        .9           -           -          -
  120       1.0           -           -          -
  125        -           43         15.5        26
  150        -           51         20          30
  205       1.5           -           -          -
  225       1.6          75         36          42
  250       1.75          -           -          -
  300       2.0           -           -          -
  400       2.5           -           -          -
  500       3.0           -           -          -
  625       3.5           -           -          -
  750       4.0           -           -          -
  875       4.5           -           -          -
  1000      5.0           -           -          -
  1125      5.5           -           -          -
  1250      6.0           -           -          -
                               
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SOURCE: textdata/thevault/Morrow Project, The/Unofficial/The Supply Bunker/Sword of Justice - Weapon Damage System (for Compendium of Modern Firearms)/Sword of Justice - Armor Types.pdf