What are glass straws made of?

Cocktail glass straw

Seastraws, just like most other glass straws you will come across, are made from a material called 'Borosilicate Glass'. 

If you haven't read our blog post about why we decided to go for glass straws, read our blog post "Glass drinking straws over stainless steel and bamboo, any day!" first. Now, let's move on. 

What is 'Borosilicate Glass'?

Borosilicate glass is a combination of boric oxide (aka boron trioxide), silica sand, soda ash (aka sodium carbonate), and alumina. Combining and melting these materials under extreme heat creates, what we call, borosilicate glass.

We're not claiming to be scientists here, so we'll leave the detailed manufacturing procedure to someone else. All we needed to know when researching materials for our reusable straws was that the structure of borosilicate glass makes it one of the most durable, temperature- and chemical resistant glass materials in the world. That's why almost ALL laboratory glassware is made out of borosilicate glass.

We agreed on that borosilicate glass would be the best and safest material for our glass straws.

Glass straws, I get it! But, can I find borosilicate glass in other products too?

Other areas where you can find the same material as we use for Seastraws is in cookware, dental cartridges, lighting, optic lenses, smoking pipes, and solar thermal technology, just to name a few.

Short glass straw in cup.

Where can I buy glass straws?

Check out our full collection of glass straws! We have everything from shorter cocktail straws to wide bubble-tea straws and every straw in between!


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