Made of borosilicate 3.3 glass, these Class A, round media bottles provide outstanding corrosion resistance and meet ASTM E438 requirements. Able to withstand temperatures from -50 to 550 °C (-58 to 1022 °F), they have a wide mouth opening that allows for easy pouring. The clear, colorless walls have a marking spot for labeling and graduations showing approximate volume. Both the bottle and polypropylene cap are autoclavable.