NOTE: The consumer drinking glass market is dominated by soda-lime glass — most brands, including well-regarded names, do not manufacture borosilicate. Many Amazon listings claiming "borosilicate" are Chinese-manufactured products with a label claim but no supporting documentation. The CI Gold Standard requires explicit manufacturer disclosure of borosilicate composition, ideally to ISO 3585 / ASTM 438 Type I Class A 3.3 standard. Only one brand in the consumer-retail market meets that bar cleanly: Borosil Vision Glass.