Glass compositions and fibers made therefrom

Claim 2

A glass composition, having improved chemical resistance to alkali attack, consisting essentially of: from 50 to 75 percent by weight Silica from 10 to 25 percent by weight R 2 O from 1 to 15 percent by weight Titania from 1 to 20 percent by weight Zirconia from 0.8 to 20 percent by weight Rare Earth Oxide from 0 to 20 percent by weight Boric Oxide from 0 to 10 percent by weight R 1 O from 0 to 1 percent by weight Fluorine (as fluoride) from 0 to 2 percent by weight A1 2 O 3 from 0 to 1 percent by weight P 2 O 5 from 0 to 1 percent by weight Chlorine (as chloride) wherein R 2 O is selected from the group consisting of Na 2 O, K 2 O, mixtures thereof, and mixtures thereof containing up to 5% by weight lithium oxide (based on the total weight of the composition) and R 1 O is selected from the group consisting of MgO, CaO, BaO, and SrO, and mixtures of two or more thereof.

Claim 3

A glass composition according to claim 1, including not more than 30% by weight of the titania and zirconia together.

Claim 4

A glass composition according to claim 1, comprising at least 20% by weight of ZrO 2 and TiO 2 together.

Claim 5

A glass composition according to claim 1, comprising at least 23% by weight of ZrO 2 , TiO 2 and rare earth oxide together.

Claim 6

A glass composition according to claim 1, including not more than 7% by weight of the R 1 O.

Claim 7

A glass composition according to claim 1, wherein any of R 1 O, fluorine, Al 2 O 3 , P 2 O 5 or chlorine's present in impurity amounts.

Claim 8

A glass composition according to claim 1, containing not more than 15% by weight of zirconia.

Claim 9

Glass fiber having a composition as defined in claim 1.

Claim 10

Cementitious material, including as reinforcement therein up to 30% by weight of glass fiber as defined in claim 6.

Claim 11

A glass composition consisting of: Silica 50% by weight Sodium Oxide 10% Lithium Oxide 1% Boric Oxide 3% Titania 10% Zirconia 10% Cerium Oxide 15% Sodium Fluoride 1%.

Claim 12

A glass composition consisting of: Silica 50% by weight Sodium Oxide 10% Lithium Oxide 1% Boric Oxide 3% Titania 10% Zirconia 10% Cerium Oxide 15% Sodium Fluoride 1%.

Claim 13

A glass composition according to claim 10, in the form of fibers.

Claim 14

A glass composition consisting of: Silica 58% by weight Sodium Oxide 13% Titania 9% Zirconia 12% Boric Oxide 3% Ceric Oxide 5%.

Claim 15

A glass composition consisting of: Silica 58% by weight Sodium Oxide 13% Titania 9% Zirconia 12% Boric Oxide 3% Ceric Oxide 5%.

Claim 16

A glass composition according to claim 12, in the form of fibers.

Claim 17

A glass composition consisting of: Silica 56% by weight Sodium Oxide 12% Titania 8% Zirconia 13% Boric Oxide 3% Calcium Oxide 6% Ceric Oxide 2%.

Claim 18

A glass composition consisting of: Silica 56% by weight Sodium Oxide 12% Titania 8% Zirconia 13% Boric Oxide 3% Calcium Oxide 6% Ceric Oxide 2%.

Claim 19

A glass composition according to claim 14, in the form of fibers.

Claim 20

A glass composition consisting essentially of: Silica 58% by weight Sodium Oxide 14% Titania 10% Zirconia 13% Boric Oxide 4% Barium Oxide 0.1% Mixture of naturally accuring rare earth oxides 0.8% Cl 0.1%.

Claim 21

A glass composition consisting essentially of: Silica 58% by weight Sodium Oxide 14% Titania 10% Zirconia 13% Boric Oxide 4% Barium Oxide 0.1% Mixture of naturally accuring rare earth oxides 0.8% Cl 0.1%.

Claim 22

A glass composition according to claim 16, in the form of fibers.

Claim 23

A glass composition consisting essentially of: Silica 58% by weight Sodium Oxide 13% Titania 7% Zirconia 14% Boric Oxide 0.5% Calcium Oxide 4% Barium Oxide 0.6% Mixture of naturally accurring rare earth oxides 2.5% Cl 0.4%.

Claim 24

A glass composition consisting essentially of: Silica 58% by weight Sodium Oxide 13% Titania 7% Zirconia 14% Boric Oxide 0.5% Calcium Oxide 4% Barium Oxide 0.6% Mixture of naturally accurring rare earth oxides 2.5% Cl 0.4%.

Claim 25

A glass composition according to claim 18, in the form of fibres.

Claim 26

A glass composition, having improved chemical resistance to alkali attack, consisting essentially of: from 50 - 58 percent by weight Silica " 11 - 14 " " " R.sub.2 O " 8 - 10 " " " Titania " 10 - 14 " " " Zirconia " 0.8 - 15 " " " Rare Earth Oxide " 0.5 - 4 " " " Boric Oxide " 0.1 - 6 " " " R.sup.1 O " 0 - 1 " " " Fluorine (as fluoride) " 0.1 - 0.4 " " " Chlorine (as chloride) Wherein R20 is selected from the group consisting of Na 2 O, K 2 O, mixtures of the two, and mixtures thereof additionally containing up to 1% by weight lithium oxide (based on the total weight of the composition) and R 1 O is selected from the group consisting of MgO, CaO, BaO, SrO and mixtures of two or more thereof.

Claim 27

A glass composition, having improved chemical resistance to alkali attack, consisting essentially of: from 50 - 58 percent by weight Silica " 11 - 14 " " " R.sub.2 O " 8 - 10 " " " Titania " 10 - 14 " " " Zirconia " 0.8 - 15 " " " Rare Earth Oxide " 0.5 - 4 " " " Boric Oxide " 0.1 - 6 " " " R.sup.1 O " 0 - 1 " " " Fluorine (as fluoride) " 0.1 - 0.4 " " " Chlorine (as chloride) Wherein R20 is selected from the group consisting of Na 2 O, K 2 O, mixtures of the two, and mixtures thereof additionally containing up to 1% by weight lithium oxide (based on the total weight of the composition) and R 1 O is selected from the group consisting of MgO, CaO, BaO, SrO and mixtures of two or more thereof.

Claim 28

A glass composition according to claim 20, in the form of fibers.