Globe Glass™ Erlenmeyer flasks meet ASTM E1404 specifications for narrow mouth, wide mouth and screw cap options and are available in a wide range of sizes. Wide mouth flasks allow easy access to contents, while screw cap flasks include a GL45 cap with a PTFE liner for a leak resistant closure. Globe Glass™ narrow and wide mouth Erlenmeyer flasks are designed with reinforced, beaded rims for strength and resistance to chipping.