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Low-boron, high-barium glass compositions and fine-diameter glass fibers for forming clean room HEPA and ULPA filters, are provided. The compositions and resulting glass fibers preferably comprise a low concentration, less than about 1 weight percent, of boric oxide, a relatively high concentration

Low-boron, high-barium glass compositions and fine-diameter glass fibers for forming clean room HEPA and ULPA filters, are provided. The compositions and resulting glass fibers preferably comprise a low concentration, less than about 1 weight percent, of boric oxide, a relatively high concentration of barium, such as from about 5.5 to about 18 weight percent barium oxide, and a concentration of alkali oxide ranging from about 10 to about 14.5 weight percent. Alumina is preferably present in the glass fiber compositions and the resulting glass fibers in a range of from about 4 weight percent to about 8 weight percent, and calcium oxide and magnesium oxide are preferably present in a range of from about 1 weight percent to about 6 weight percent and from about 0 weight percent to about 3.5 weight percent, respectively. The glass fiber compositions also preferably include from about 2 to about 6 weight percent zinc oxide, from about 0.1 to about 1.5 weight percent fluorine, and very low concentrations of manganese oxide, ferric oxide and various impurities such as strontium oxide, lithium oxide, titanium oxide, and zirconium oxide. Preferably, the balance of the composition is silicon dioxide.

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1. A low-boron, high-barium concentration glass fiber composition comprising:less than about 1 weight percent boron;from about 5.5 to about 18 weight percent barium oxide;from about 10 to about 14.5 weight percent alkali metal oxide;from about 4 to about 8 weight percent alumina;from about 1 to abou

1. A low-boron, high-barium concentration glass fiber composition comprising:less than about 1 weight percent boron;from about 5.5 to about 18 weight percent barium oxide;from about 10 to about 14.5 weight percent alkali metal oxide;from about 4 to about 8 weight percent alumina;from about 1 to about 9 weight percent alkaline earth oxide, excluding barium oxide;from about 2 to about 6 weight percent zinc oxide;from about 0.1 to about 1.5 weight percent fluorine; anda balance of the glass fiber composition being silica. 2. The glass fiber composition of claim 1, wherein the boron is present as B 2 O 3 , alkali metal oxide is present as Na 2 O or K 2 O, and alkaline earth oxide is present as GaO or MgO. 3. The glass fiber composition of claim 1, wherein the alkali oxide is present as Na 2 O and K 2 O and alkaline earth oxide is present as CaO and MgO. 4. The glass fiber composition of claim 1, further comprising less than about 0.2 weight percent of one or more compounds selected from the group consisting of MnO, SrO, Li 2 O, TiO 2 , ZrO 2 and Fe 2 O 3 . 5. A low-boron, high-barium glass fiber composition comprising:less than about 1 weight percent of boric oxide;from about 6 to about 16 weight percent barium oxide;from about 10 to about 12.5 weight percent of alkali metal oxide;from about 5 to about 6 weight percent of alumina oxide;from about 1 to about 9 weight percent alkaline earth oxide, excluding barium oxide;from about 2 to about 5 weight percent zinc oxide;from about 0.1 to about 1.0 weight percent fluorine; anda balance of the composition being silica. 6. The glass fiber composition of claim 5, wherein the glass fiber composition forms glass fibers having an average diameter of from about 0.1 μm to about 3.0 μm. 7. The glass fiber composition of claim 5, wherein boron is present as B 2 O 3 , alkali metal oxide is present as Na 2 O and K 2 O, and alkaline earth oxide is present as CaO and MgO. 8. The glass fiber composition of claim 5, further comprising less than about 0.2 weight percent of one or more compounds selected from the group consisting of MnO, SrO, Li 2 O, TiO 2 , ZrO 2 , and Fe 2 O 3 . 9. A low-boron, high-barium glass fiber composition comprising:less than about 1 weight percent of boron;from about 6 to about 16 weight percent barium oxide;from about 10 to about 12.5 weight percent of alkali metal oxide;from about 5 to about 6 weight percent of alumina oxide;from about 1 to about 9 weight percent alkaline earth oxide, excluding barium oxide;from about 2 to about 5 weight percent zinc oxide;from about 0.1 to about 1.0 weight percent fluorine;a balance of the composition being silica; andwherein the glass fiber composition forms glass fibers having an average diameter of from about 0.1 μm to about 8.15 μm. 10. The glass fiber composition of claim 9, wherein the glass fibers have an average diameter of from about 0.1 μm to about 3.0 μm.