Not sure of the spelling of it but I will give it a shot.
ALUMINUM TiHYDRATE…
My new rep that deals with the aerospace industry here in New Mexico is going to send me a new tooling resin and some of this additive to try out and see if I like it.
Supposedly its a great resin for tooling as the additive keeps it from shrinking too much and ruining your mold after awhile.
I was told that the manufacturer recommends that you use it as a 50/50 mix with your resin and you catalyze at the resin weight before adding the ATH. It supposed to still wet out really well but after telling him my skepticism about it I got him to offer up a 5 gal pal and some of the powder to mix to my liking and give it a serious try.
If it works for me I will let you all know my results