Comparative Ballistics Data for Types of Armor

Ambient temperature Charpy test?

Would be indicative - if I could find the numbers for the range, but so far have only one or two steel products that quote them.

_{BTW GA}

of course I know nothing about this subject.. but came across this text in a pdf book I was reading.

"Bulletproof vests, unlike regular clothing,
must undergo stringent protection testing as
required by the National Institute of Justice
(NIJ). Not all bulletproof vests are alike.
Some protect against lead bullets at low
velocity, and some protect against full metal
jacketed bullets at high velocity. Vests are
classified numerically from lowest to highest
protection: I, II-A, II, III-A, III, IV, and special
cases (those for which the customer
specifies the protection needed). Each classification
specifies which type of bullet at
what velocity will not penetrate the vest.
While it seems logical to choose the highestrated
vests (such as III or IV), such vests are
heavy, and the needs of a person wearing one
might deem a lighter vest more appropriate.
For police use, a general rule suggested by
experts is to purchase a vest that protects
against the type of firearm the officer normally
carries."

so when I searched for it.. there is this site http://www.closefocusresearch.com/html/site_map.html

but couldn't get any further...

good luck

Thanks Chris, I found my way in, prowled about, found some relevant stuff, but not exactly, so have asked them the question. We shall see if the answer is forthcoming, meanwhile;

Score 1 Great Assistance