View detailed export data, price, monthly trends, major exporting countries, major ports of frits ceramic Nov 13, 1990 · lead-free glass frit compositions for use in vitreous coatings consisting essentially of na 2 o--zno--b 2 o 3--sio 2 in appropriate concentrations including molar amounts of at most 17.5 mole percent of b 2 o 3 and at least 40 mole percent of sio 2. Typically, the glass frit in front contact silver paste for silicon solar cells is usually lead-based , , . it is well known that several researchers have been devoting to the substitute for lead-based silver paste due to its exposure and pollution , . bi-based glass frit turned out to be the most promising substitute . Dairy farming constitutes three per cent of saudi arabia's gdp with current production totalling 1.13 billion kg at an annual growth rate of four per cent. yet despite this large production capacity, saudi arabia does not have the capability to meet growing demand for dairy products, which is forecasted to grow to 1.3 billion kilogram by 2018.