초록 ▼

There is disclosed a barium-free Type I, Class B laboratory glass according to the standard specification set forth in ASTM E 438-80a having a linear coefficient of expansion (0°to 300°C., cm/cm-°C.×10-7) of about 48 to 56 and having a chemical durability, maximum titration equivalent of: 0.2N H2SO4

There is disclosed a barium-free Type I, Class B laboratory glass according to the standard specification set forth in ASTM E 438-80a having a linear coefficient of expansion (0°to 300°C., cm/cm-°C.×10-7) of about 48 to 56 and having a chemical durability, maximum titration equivalent of: 0.2N H2SO4/10 g of glass of 1.0 ml, the composition consisting essentially of the following ingredients in approximate percent by weight: ________________________________ - Ingredient Percent ________________________________ SiO2 70-74 B2O3 9-13 Al2O3 5-8 Na2O 5-8 K2O 0-4 CaO 0-3 MgO 0-1 ________________________________ the glass composition having an annealing point of about 550°C. to 585°C., a liquidus of about 1730°F. to 1760°F. and a Log n at the liquidus about 5.0 to 5.5.

대표청구항 ▼

A barium-free Type I, Class B laboratory glass according to the standard specification set forth in ASTM E 438-80a having a linear coefficient of expansion (0°to 300°C., cm/cm-°C.×10-7) of about 48 to 56 and having a chemical durability, maximum titration equivalent of: 0.02 N H2SO4/10 g of glass of

A barium-free Type I, Class B laboratory glass according to the standard specification set forth in ASTM E 438-80a having a linear coefficient of expansion (0°to 300°C., cm/cm-°C.×10-7) of about 48 to 56 and having a chemical durability, maximum titration equivalent of: 0.02 N H2SO4/10 g of glass of 1.0 ml, the composition consisting essentially of the following ingredients in approximate percent by weight: ________________________________ - Ingredient Percent ________________________________ SiO2 70-74 B2O3 9-13 Al2O3 5-8 Na2O 5-8 K2O 0-4 CaO 0-3 MgO 0-1 ________________________________ the glass composition having an annealing point of about 550°C. to 585°C., a softening point of about 783°to 799°C., a liquidus of about 1730°F. to 1760°F. and a Log n at the liquidus about 5.0 to 5.5.