The specifications of term words NIJ standards

1. Compliance Test Group A group of armor samples six,four,or nine complete garments,submitted to the NIJ ctp for testing according to standard(sec.4.7).

2. Deformation The maximum momentary displacement of the rear surface of an armor pannel,caused by a fair hit that does not penetrate the armor,when the armor is in initial contact with the backing material.

3. Fair Hit A bullet that impacts the armor sample or panel at an angle of incidence no greater than ±5°from the intended angle of incidence,no closer to the edge of the ballistic panel than 76mm(3.0in)and no closer to a prior hit than 51mm(2.0in),at an impact velocity within ±9.1m/s(30ft/s)of the requiredreference test velocity. A bullet that impacts the armor sample or panel at an angle of incidence no greater than ±5°from the intended angle of incidence,no closer to the edge of the ballistic panel than 76mm(3.0in)and no closer to a prior hit than 51mm(2.0in),at an impact velocity less than 9.1m/s(30ft/s) below the required reference test velocity which produces a penetration or an excessive backface signature. A bullet that impacts the armor sample or panel at an angle of incidence no greater than ±5°from the intended angle of incidence,no closer to the edge of the ballistic panel than 76mm(3.0in)and no closer to a prior hit than 51mm(2.0in),at an impact velocity less than 9.1m/s(30ft/s) above the required reference test velocity which does not produce a penetration or an excessive backface signature.

4. Full Metal Jacketed Bullet(FMJ) A bullet consisting of lead core completely covered, except for the base,with copper alloy(approximately90% copper and 10%zinc)."Tatal Metal Jacket(FMJ),""Totally Enclosed Metal Case(TEMC),"and other commercial teminology for bullets with electro deposited copper and copper alloy coating have been tested and are considered comparable to Full Metal Jacked(FMJ)bullets for this standard.

5. Insert A removable or nonremovable unit of ballistic material which can be part of either the armor in a specific area (also known as "trauma packs"or "trauma plates").

6. Jacketed Hollow point Bullet(JHP) A bullet consisting of a lead core which has a hollow cavity or hole in the nose of the bullet and is completely covered except for the hollow point with a copper alloy (approximately 90% copper and 10% zinc)jacket.

7. Jacketed Soft Point Bullet(JSP) A lead bullet,also known as a Semi Jacketed Soft Point (SJSP),completely covered,except for the point,with copper alloy(approximately 90% and 10% zinc)jacket.

8. Lead Bullet A bullet made entirely of lead,which may be alloyed with hardening agents.

9. Mimum Velocity The designated NIJ Standard-0101.04 reference impact velocity(sec.5.4,table 1) less 9.1m/s(ft/s).

10. Model A manufacturer's designation(name,number,or other description)that serves to uniquely identify a specific configuration of body armor based upon the details of the ballistic panel construction(i.e.,the number of layers of one or more types of ballistic resistant material assembled in a specific manner or the manner in which the armor is held in place upon the torso).

NIJ verifies the ballistic resistance of a model based on ballistic testing of model samples in accordance with this standard.As an exmple,differences in stitching (e.g.,box sitch versus quilt stich)would make the ballistic panels different models.If a model of armor fails compliance testing,the manufacturer may never resubmit any armor under that model designation.