My friends, Goodmedicine and his son MEAD, sent me some interesting material called "multi-ply Kevlar / thermoset resin laminate sheet".

This stuff is used as a "spall liner".

Here's what we could find out about spall liner.

"Recently, many manufacturers have added a spall liner to the inside of the armour, which is designed to absorb fragmentation (spallation) released from the impact of an enemy shell, protecting soldiers and equipment inside. They tend to be made from Kevlar or similar materials.”

Goodmedicine warned me, "Do not try to cut this stuff with any of your saws, if you do you will get nothing but blue smoke and a VERY dull blade. (Don't ask me how I know this. )"

MEAD advises that they use water-jet cutters to cut this material. It looks like a combination of fiberglass and Kevlar.

It is stiff and hard as can be. It is about 1/2 inch thick.

This is the set-up. We placed four sheets on a board and cross laid 4 more the other direction.

This gave us about 1 inch thickness.

This material is not designed to stop bullets, we are doing this to see how tough this stuff really is.

I am not trying to conduct any scientifically valid test. We are just having some fun and seeing if this stuff will stop bullets, even though that is not its primary purpose.

First a .22 LR from a pistol.

You will notice that I stood back a ways. Wasn't sure if the bullet would bounce off the material or what.

It slightly penetrated the front of the first layer, but did not penetrate the first layer.

Next a 9mm 115 grain Ball from my Hi-Power.

Notice the brass in the air.

It kind of flattened out and was "squished" out of the side of the first layer.