Gerstley Borate is a sodium-calcium-borate compound used in ceramics as a low and mid-range temperature flux. It is essentially a source of boron in glazes, and acts as a melting agent. It also can act somewhat as an opacifier and prevent crazing.

See our Safety Data Sheets section under Customer Service for a downloadable copy of the SDS for this product.

NOTE: WE HAVE PUT A LIMIT ON THIS PRODUCT DUE TO LACK OF AVAILABILITY GOING FORWARD, YOU WILL ONLY BE ABLE TO ADD A MAXIMUM OF 5, 1KG UNITS TO YOUR CART. WE ARE TESTING SUBSTITUTES AND EXPECT TO HAVE ONE AVAILABLE SHORTLY.