Cold boxes for tubes (CB)

Convenient box prevents expensive enzymes and critical samples from warming. Handy unit consists of a molded polystyrene container with cover. Internal support holds twelve 1.5 ml microcentrifuge tubes. The space surrounding the tubes is filled with a sealed-in material that maintains the low temperature required for safe storage and transport. When the container is removed from a -20°C freezer, it will maintain a -15°C temperature for 1.5 hours, and will remain below 0°C for 4 hours.