Glass Durability Specification Moves Up The Formulation Ladder
As serum active concentrations climb and pH falls, the container stops being neutral. Soda-lime glass leaches alkali into acidic aqueous formulations, and a shift of roughly 0.4 pH across shelf life is sufficient to degrade ascorbic acid below its label claim. Brands that discovered this the expensive way now specify internally treated or borosilicate glass at the formulation stage rather than the packaging stage. Borosilicate currently accounts for around 23% of units and rises steadily. The cost step is real, running several times moulded soda-lime, which is why adoption tracks active concentration rather than brand tier.
Market Impact: South Korea grows at 12.2%








