The product you are looking for is made by PQ Corporations, I'm not sure if it's still sold there. I'd give their customer service centers a call. One of the products they specialize in is silicas.

http://www.pqcorp.com/pc/North-America/Products/Silicas

I think you'll probably have to do some digging yourself, but I hope this gets you a start in the right direction.

Cheers!

Thanks Michael,

Martin

Thanks for the help guys!!!! I already got two kinds of silica from the company you suggested.