2018-10-27 · Product Specification. Sodium Feldspar contains high amount of Na-Feldspar (Na2O>7.5%), or highly mixed of Na2O and K20 minerals with total flux more than 9.0%. The sodium feldspar is used in production of wall, floor tiles, sanitary ware, earthenware, sheet glass, glass, etc. This product can be prepared according to customers'' needs. Resources.