Patent ID: 8042363

Claim:
Composition for production of continuous basalt fiber containing the mixture of silicon (SiO 2 ), aluminum (Al 2 O 3 ), titan (TiO 2 ), iron (Fe 2 O 3 and FeO), calcium (CaO), magnesium (MgO), manganese (MnO) oxides and admixtures, wherein this composition further contains potassium (K 2 O), sodium (Na 2 O), barium (BaO) oxides with the following components ratio (in mass %): Al 2 O 3 15.90-18.10 TiO 2 0.75-1.20 Fe 2 O 3 + FeO 7.51-9.53 CaO 6.41-8.95 MgO 2.50-6.40 K 2 O 1.60-2.72 Na 2 O 3.30-4.10 P 2 O 5 0.23-0.50 SO 3 0.02-0.15 MnO 0.12-0.21 BaO 0.05-0.19 admixtures, up to 1.00 SiO 2 the rest, the fiber composition having an upper crystallization limit temperature T ucl in the range of 1210° C. to 1230° C.