Special Threat Plates
Special threat plates (STP), also known as multi-threat, special purpose, rifle, and special application plates, are plates that have a notably higher ballistic rating(NIJ standard) than the vest. There is no standard for materials or ballistics for these plates, though most meet the NIJ Standard for armor type III. Many of these plates are made of a combination of materials, like ceramic on plastic, plastic on metal, etc.
Some manufacturers use these labels more for marketing than really offering enhanced protection.
Read more about this topic: Ceramic Plate
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