You don't. Ion-strengthened glassware is manufactured in at least Turkey (Nude glass), France (Duralex) and Portugal (closed the tab and don't remember). Ther

You don't. Ion-strengthened glassware is manufactured in at least Turkey (Nude glass), France (Duralex) and Portugal (closed the tab and don't remember). There doesn't appear to be a US brand making glassware with the process, which is a shame. But the US is the leading manufacturer of ion-strengthened glass for technical products, supplying Asian brands. You probably have a piece of it in your pocket.