초록 ▼

The invention relates to a glass having the composition (in % by weight, based on oxide) SiO2about 78.5-about 79.5, B2O3about 13.0-about 14.0, Al2O3about 2.0-about 3.0, Na2O about 4.5-about 5.5, K2O 0-about 0.6, which may be used in the production of thermal shock-resistant beverage containers, part

The invention relates to a glass having the composition (in % by weight, based on oxide) SiO2about 78.5-about 79.5, B2O3about 13.0-about 14.0, Al2O3about 2.0-about 3.0, Na2O about 4.5-about 5.5, K2O 0-about 0.6, which may be used in the production of thermal shock-resistant beverage containers, particularly teapots, coffee machine jugs and baby-milk bottles.

대표청구항 ▼

1. A glass comprising in % by weight, based on oxide: SiO2about 78.5-about 79.5, B2O3about 13.0-about 14.0, Al2O3about 2.0-about 3.0, Na2O about 4.5-about 5.5, K2O 0-about 0.6, and optionally at least one fining agent; and Er2O3,CoO, or a combination thereof. 2. A process for making glass comprising

1. A glass comprising in % by weight, based on oxide: SiO2about 78.5-about 79.5, B2O3about 13.0-about 14.0, Al2O3about 2.0-about 3.0, Na2O about 4.5-about 5.5, K2O 0-about 0.6, and optionally at least one fining agent; and Er2O3,CoO, or a combination thereof. 2. A process for making glass comprising melting together: about 78.5 to about 79.5 weight percent based on oxide SiO2; about 13.0 to about 14.0 weight percent based on oxide B2O3; about 2.0 to about 3.0 Al2O3weight percent based on oxide; and about 4.5 to about 5.5 Na2O weight percent based on oxide; and Er2O3,CoO or a combination thereof. 3. A glass comprising in % by weight, based on oxide: about 78.5 to about 79.5 SiO2; about 13.0 to about 14.0 B2O3; about 2.0 to about 3.0 Al2O3; about 4.5 to about 5.5 Na2O; and Er2O3,CoO, or a combination thereof. 4. A glass according to claim 1, wherein the glass has a coefficient of linear thermal expansion α20/300between about 3.5 and about 3.7·10-6/K, a working point VAof ≤about 1220° C., and a modulus of elasticity of ≤about 65 GPa. 5. A glass according to claim 1, wherein the glass has a hydrolytic resistance in accordance with DIN ISO 719 in hydrolytic class 1, an acid resistance S in accordance with DIN 12 116 in acid class 1, and a caustic lye resistance L in accordance with DIN ISO 659 in lye class 2. 6. A glass according to claim 3, wherein the glass has a coefficient of linear thermal expansion α20/300between about 3.5 and about 3.7·10-6/K, a working point VAof ≤about 1220° C., and a modulus of elasticity of about 65 GPa. 7. A glass according to claim 3, wherein the glass has a hydrolytic resistance in accordance with DIN ISO 719 in hydrolytic class 1, an acid resistance S in accordance with DIN 12 116 in acid class 1, and a caustic lye resistance L in accordance with DIN ISO 659 in lye class 2. 8. A teapot, coffee machine jug or baby milk bottle comprising a glass according to claim 1. 9. A teapot, coffee machine jug or baby milk bottle comprising a glass according to claim 3. 10. A thermal shock-resistant container comprising the glass according to claim 1. 11. A thermal shock-resistant container comprising the glass according to claim 3. 12. A process according to claim 2 further comprising heating the oxides in a heated melting unit to no more than about 1620 degrees Celsius.