A primary ingredient as a flux in a glaze.
£7.58 ex. VAT
The Gerstley Borate Substitute. This is a blended borate mineral; they claim it is better than the Gerstley it replaced, having fewer impurities.
Source: UK
Other details: 31% LOI
For advice and further reading, read our 'Using Raw Materials' PDF.
B2O3 25%, CaO 23%, 4% total alkali* There should be silica content, but they have not declared it.
*Typical analysis, supplied by the supplier.
Considered a nuisance dust; therefore, we recommend wearing an FFP3/P3 Mask. Keep working areas free of dust by cleaning up with a damp sponge.
Children should not work with raw materials.
See the SDS in the product attachments for more information.
