Re: how much silicon dioxide is safe to mix with dried foods for non-caking

Ms. Torberson,

The FDA regulations concerning the use of silicon dioxide as an anticaking 
agent states - It is used in an amount not to exceed 2 percent by weight of 
the food. It can be found on the FDA website - http://www.fda.gov/ It is 
part of the Code of Federal Regulation 21CFR172.480.

I hope this provides the information you were looking for.

Al Bushway
Professor of Food Science