PC. Resist ultra-low storage-temperatures from - 196 up to + 121 °C. Autoclavable. With grid numbers on the lid for reliable identification of individual samples. Lid fits one way only to maintain the correct grid orientation. Box fits most st. steel racks. PC. Resist ultra-low storage-temperatures from - 196 up to + 121 °C. Autoclavable. With grid numbers on the lid for reliable identification of individual samples. Lid fits one way only to maintain the correct grid orientation. Box fits most st. steel racks.