Believe me I was worried I would slip on the damn thing and break my ass! It crushed into a million pieces literally. It was a casting from a well known person here. If you look at the cross section of the resin it is all bubbled like a sponge. Small air pockets. I figured out it is from using filler in the resin, using that fumed silica stuff.. I know because I used the fumed silica on a different armor resin part. When I snapped a piece off of it I could see the a Sponge Like resin. It also was significantly lighter.
Whatever the silica does it makes the bio significantly weaker. That BOAR helmet was actually hot glued back together in the face, it was dropped while packaged INSIDE a carboard box and the thing cracked into three pieces. Was not a particularly hard fall either, I attribute it to the Sponge Like structures, and not being a solid non-filler resin.
Some of advantages to using the filler is it becomes quickly and easily brushable in a mold. Which saves on material and time.
I have never used the filler in my Bio helmets to this degree. It was always more important to me that the helmet be stronger, rather than have it crack from a gentle fall. We all know how much abuse these things get at conventions, imagine it snapping and not having a backup.
Another reason I like my personal helmets to be fiberglass, imagine a helmet that is 1/8" thick and strong enough to stand on. And has half the weight of a regular resin helmet are all used too. Fiberglass is slow to cure and stinks, which is not good for mass production. A downside for some.
I am about to leave to pickup the silicone. I will just show some pictures of what I have and go with a decent priced silicone.
I plan on pouring the mold this weekend, I will take pictures and video for everyone.
Thanks for all the help, it is MOST APPRECIATED! Happy thanksgiving guys.