Method for producing colored glass for pharmaceutical containers and colored glass for pharmaceutical containers
The present invention relates to a method of producing a colored glass for a pharmaceutical container by which the transmittance of a glass to be obtained is easily controlled so as to satisfy the standards of the Japanese Pharmacopoeia.
1. A colored glass for a pharmaceutical container, comprising as a glass composition, in terms of mass %, 65% to 75% of SiO 2 , 0% to 20% of B 2 O 3 , 1% to 10% of Al 2 O 3 , 1% to 10% of R 2 O, where R is selected from at least one of Li, Na, and K, 1% to 5% of R′O, where R′ is selected from at least one of Ca and Ba, 0.01% to 5% of Fe 2 O 3 , and 0.01% to 5% of TiO 2 , further satisfying a relational expression of 1.00≤[Fe 2 O 3 (content of Fe 2 O 3 )]×[TiO 2 (content of TiO 2 )]≤3.50, and satisfying a transmittance (ultraviolet transmittance) specified in “Light transmission test for light-resistant containers” of the Japanese Pharmacopoeia, section 7.01.
2. The colored glass for a pharmaceutical container according to claim 1 , wherein the colored glass has a thickness of less than 1 mm and satisfies a relational expression of 1.20≤[Fe 2 O 3 (content of Fe 2 O 3 )]×[TiO 2 (content of TiO 2 )] in terms of mass %.