the mainly specifications are as follows: (1) Specs.: CaF2: 95% MIN SiO2: 4% MAX Size: 10-50mm 90% min (2) Specs.: CaF2: 92% MIN SiO2: 7% MAX Size: 10-50mm 90% min (3) Specs.: CaF2: 90% MIN SiO2: 8% MAX Size: 10-50mm 90% min (4) Specs.: CaF2: 85% MIN SiO2: 14% MAX (A) Size: 10-50mm90% min (B) Size: 0-20mm90% min