Gerstley Borate

5KG GERSTLEY BORATE

Part #MGYB4

Regular price
CDN$41.33
Sale price
CDN$41.33
Regular price
Sold out
Unit price
per 
Shipping calculated at checkout.

A mixture of colemanite, ulexite and clay-like minerals, Gerstley borate is a naturally occurring source of boric oxide, a glass former which promotes early fusion. It is no longer being mined but significant supplies remain available. Good blended substitutes and borosilicate frits with similar, early melt properties are also available.