Pyrex® beakers are the science industry standard worldwide. Choose the right size for your lab needs, ranging from 50 ml to 2000 ml. Made of high-quality borosilicate glass that can be heated directly in an open flame and withstand thermal shock, Pyrex® beakers are primarily used for mixing and heating. Graduations are approximate and not intended for accurate liquid measurement. Pyrex® beakers details: Pyrex low form Griffin beakers (or Pyrex) are made from high quality borosilicate glass that meets ASTM E960 specifications Low coefficient of thermal expansion means this glass withstands typical laboratory temperature variations Markings are accurate to +/-5%