Monofrax in February Issue of Glass International Monofrax in February Issue of Glass International March 2, 2021 Valerie Weber If you would like to learn what a lipstone is, check out Glass International magazine’s February issue. Learn about lipstones, lip spouts in casings, and how they affect float glass production. Valerie Weber March 2, 2021 Categories:News Tags:lip spout, lipstone, spout lip, spout lip casing