Part of the GL (glass laboratory) thread standard, the GL38 thread has become essential for packaging solvents in laboratory settings. It's commonly found on amber 4-liter glass bottles from chemical suppliers and is valued for its secure fit with airtight safety caps, ensuring the safe storage of volatile chemicals.

While the GL38 thread technically features a 38-430 thread finish, its slightly different height makes it incompatible with the 38-430 threads on plastic bottles. Specifically designed for glass containers, GL38 threads are a trusted choice for solvents, reagents, and other chemicals in both laboratory and industrial applications.