Engler distilling flasks, DURAN^®, ASTM, with beaded rim

Uniform wall thickness distribution makes these flasks ideal for heating applications and distillations. The flasks are manufactured from a hydrolytically resistant borosilicate glass 3.3, which is defined as "Type I, Class A" in the ASTM Specification E 438.

• ASTM D86
• DIN EN ISO 3405