These 160mL Pyrex® narrow mouth bottles are for general storage of solutions and tissue culture work. Uses a GPI 28-400 threaded phenolic screw cap (Cat.No. 1-9999-28) with rubber liner. Will withstand autoclaving at 121°C. Meets the requirements for milk dilution bottles stated in the Standard Methods for the Examination of Dairy Products, published by the American Public Health Association.