Hi Rita,
Here is the reply that I got from my friend Ken in Canada. Hope it helps !
Marc
Hi Marc:
What you are looking for is generically called 'desiccant' (spelling varies, either having one 'c' or two.), the most common type is a silica-gel based one. It should be widely available and obtainable for the public.
-Silica-gel usually comes in any size up to 2kg.
-They are individually packaged in a heat resistant and porous package.
-They will absorb 35% of their own weight in atmospheric moisture.
-They can be re-activated by heating to 120 degrees Centigrade for twelve hours.
-They are inert and non-toxic.
-In extreme moisture they will heat up slightly as they absorb, this is not a factor unless they are in contact with liquid water. (They are exothermic)
-Usually come with re-usable humidity indicator cards that will tell you when to change the desiccant.
http://desiccare.com/homeprod.htm (located in Santa Fe Springs)
Have provided a link above for reference. Seems over priced and shipping a granulated powder seems a little 'iffy' these days. Still, it will give you a better idea of what you are after. You are in Silicon Valley, they must use the stuff by the ton and have several local retailers.
Did a quick search and found a few:
Sun Garden Packing
1582 Monterey Hwy
San Jose, CA 95110
800-866-6001
Silica Gel Desiccant Products
734 E Hyde Park Blvd
Inglewood, CA 90302
800-426-1529
Hope this helps, will also get the address of the company that provides us with desiccant, though I think they only do 45 gallon drums of it.
Ken.