The Last Straw – Glass Straws by Carli Rotating Header Image

FAQ on the Care and Feeding of Glass Straws

Q: What is borosilicate glass?
A: Borosilicate glass is a specific type of glass, the same glass you may know as Pyrex, which was created by Corning. Borosilicate glass, or “boro” for short, is made with the silica and boron oxide. Borosilicate glass is most well known for having very low thermal expansion, making it resistant to thermal shock, more so than any other common glass. What that means is, it doesn’t break easily, which is why it is used in glass cookware that goes in the oven,  microwave, and dishwasher. It is also a non-porous and Hypo-allergenic material,  which is why it is so safe for food use. Borosilicate glassware has increased durability and has microwave and dishwasher compatibility over other types of glass.

Q: Where is your glass from?
A:We use a glass called Simax for the main body of our straws. We prefer local businesses, but this is a very high grade borosilicate glass, and is not available locally. Research and testing of different boro glass led us to choose Simax, which is not made in Oregon, but we buy from a location less than one hundred miles away. However,  ALL of the colored glass used in accents on our straws IS local to our studio, less than 15 miles away. This helps lower our, and your,  carbon footprint when buying from our lines of straws.

Q: Can you make a special size straw for me? I have this favorite tumbler I use…
A: Yep! We can.  We can tailor make a straw to your desired length, width, or even thickness of the straw wall.  Please email us with your specifications and we will contact you with a quote.

Q: Will my straw ever break if I put it in the dishwasher?
A: Nope, unless you are throwing it in there with hurrican force! Straws will easily withstand dishwasher and even microwave use,  just like Pyrex cookware and dishware. We recommend sanitizing your straws in the dishwasher to help keep it clean. This sort of use and cleaning is normal use, and your straw will not break under normal, everyday use.

Q: What if my straw gets a crack, or chips?
A: If you ever notice any chipping, cracking or breaking,  stop using the straw!  If it is dropped there is a possibility of chipping or breaking.  It is, after all, glass, even if it is some of the strongest glass on the planet. Email us at: to let us know. If we cannot repair it to original condition when you return it to us, we will gladly replace it free of charge,  including shipping. We guarantee the life of your straw forever; if it breaks, we will gladly replace it for you.

Q: How do I get a refund if I am not satisfied with my glass straws?
A: Email us at: if you are not satisfied with your straw. We will issue you a refund for the total amount of your purchase (excluding shipping).

Q: My straws have become opaque and dingy looking, what can I do?
A: Think of your straws like other glasses in your dishwasher. Over time they can become more opaque due to the minerals in your water supply. If your glass drinking straws become “cloudy” from hard water conditions in the dishwasher, simply soak in distilled white vinegar.  Another tip for cleaning is to rinse them right after use, keeping them crystal clear and clean without using the brush!

Q: Can my child use your straws?
A: We recommend glass straw use only for kids 6 years of age and older. They are fun and pretty, but we would hate to have your child accidentally chomp down hard and hurt their teeth,  or their mouth,  even if the straw didn’t crack! Use good sense and teach your children about how to use this straw. Then they too can contribute to creating a cleaner, greener, healthier world! Not to mention being the hit of the lunchroom with their cool straw!

Q: Do you wholesale?
A: Of course! The more folks use glass straws, the less plastic straws are “needed” to be made! Email us at for wholesale pricing.