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£5.75 GBP
Type: fluxes
In stock - 11 in stock, ready to ship

Colmanite - 1kg

B2O3 43.9%, CaO 26%, SiO2 4.5%.  

Insoluble source of boron. A powerful flux which can intensify colouring oxides and increase craze resistance.

Sieve course material before use.