Bentonite (Clay)
From PyroGuide
Formula: (Na,Ca)0.33(Al,Mg)2Si4O10(OH)2·(H2O)n
Synonyms: Bentonite Clay, Gumbrin, Akajo, Aquagel (gold), Asama, Askangel, Baroco, Yellow stone, Western bond, Natural gel, and many others...
Description: Bentonite is a white solid, mostly in dust or pellet form. It is generally used for nozzles, since it doesn't disintegrate quickly like cardboard or other products. Because bentonite clay is a very important in making fireworks it is listed in the Beginners’ pages.
Hazards: Bentonite, in dust form, is suspected to be carcinogenic. Wear a dust mask or respirator when working with bentonite.
Sources: Bentonite is easy to obtain. Pottery stores sells it, but a cheaper alternative is "Clumping Kitty Litter," which is often Bentonite clay, and can be found in most supermarkets. One of the best brands to use is "Fresh Step," which (unlike many other types of clumping kitty litters) does not erode or crumble easily. In Australia ,rural store , Unimin "activegel" 20k bag used to seal leaking dam.
