When we started Starglass, our first major decision was choosing the core material for our bottles. The market is flooded with stainless steel and high-end plastics, but after months of testing, we chose borosilicate glass. Here's why.
The Taste Test
Have you ever left water in a stainless steel bottle overnight, only to wake up and find it tastes slightly metallic? Or used a plastic bottle that permanently holds the ghost flavor of last week's iced tea? That's because those materials are porous or reactive.
Borosilicate glass is entirely non-porous and chemically inert. It's the same glass used in high-end laboratories because it won't leach chemicals or absorb flavors. When you drink from a Starglass bottle, you taste exactly one thing: water.
Thermal Shock Resistance
Regular glass shatters when exposed to rapid temperature changes (like pouring hot tea into a cold bottle). Borosilicate glass contains boron trioxide, which gives it a very low coefficient of thermal expansion. This means it can withstand extreme temperature changes without cracking.
Whether you're filling it with ice water for a summer commute or hot green tea for a winter morning, your Starglass bottle can handle it safely.
The Purity Promise
Many metal bottles on the market actually contain hidden plastic linings to prevent the metal from rusting or affecting the taste of the water. With Starglass, there are no hidden linings, no BPA, no BPS, and no phthalates. Just pure glass and food-grade silicone.
"We didn't want to make just another water bottle. We wanted to make the last water bottle you'll ever need to buy."
Built for Life
Glass has a reputation for being fragile, which is why we engineered our signature silicone sleeves. They provide shock absorption for the inevitable bumps and drops of daily life, while giving you a secure, comfortable grip.
By choosing borosilicate glass, we're choosing a material that doesn't degrade over time, doesn't scratch easily, and remains crystal clear year after year.