We use both clear and color borosilicate glass to make our glass straws. This type of glass was discovered in the late 1800s.
The main ingredients of borosilicate are silica and boron oxide. We had all our glass tested by a third-party laboratory to verify the safety and toxin-free integrity of its composition. There is no lead or other harmful ingredients in the glass. Our glass is BPA-Free, Lead-Free and Toxin-Free.
Borosilicate is non-porous and hypo-allergenic. So even if there was a harmful ingredient in your glass straw, it would never leach into your beverage.
Borosilicate has super durability being more resistant to breaking than other glass, and colors stay brilliant after each use and wash.
Borosilicate is already used for high-quality beverage glassware and kitchenware (like measuring cups, coffee pots), so this is not a new type of glass.
Borosilicate is microwave, oven, freezer and dishwasher safe. You can heat it up to 1500 degrees Fahrenheit before it will melt!