DUE TO CHANGES IN COURIER WEIGHT REGULATIONS, WE CAN NO LONGER SHIP 25KG BAGS IN A BOX AS IT IS OVER THE 25KG MAXIMUM SHIPMENT. THEY WILL NEED TO BE SHIPPED IN HEAVY DUTY PLASTIC BAGS. IF 6 OR MORE BAGS ARE ORDERED, WE CAN SHIP VIA A PALLET. UNFORTUANETLY, WE WONT BE ABLE TO ASSIST IN ANY CLAIMS IF THERE IS DAMAGE IN TRANSIT, AS THIS IS OUT OF OUR CONTROL.
Feldspar Potash 200F (200 mesh) is also known as K-Feldspar, Orthoclase, K Feldspar, Potassium Feldspar.
One of the most important materials for medium and high temperature ceramic glazes. A feldspar is typically referred to as 'potash' if there is significantly more potassium than sodium (typically there will be 2-5% Na2O). If the amounts are closer to equal they are termed potash-soda feldspars (or vice versa). Of course, real potash feldspars also have small amounts of CaO, MgO, Fe2O3, etc.
Potassium feldspar melts at around 1200C (higher than soda feldspar) producing a more a viscous melt than does sodium feldspar. It can also produce a crystalline phase (leucite) that contributes to opacity. Thus, in industry, potash feldspars are often used more for matte glazes while soda feldspar is used for glossy glazes.
Glazes high in feldspar (35% or more) are plagued by crazing problems, yet still used by tens of thousands of potters. 'Flux saturated' glazes with more than 50% feldspar may be unbalanced and lack adequate glass former or alumina to create a stable hard glass resistant to leaching.