Tough-Tags are chemically inert labels that strongly adhere to microtubes, test tubes, storage boxes and other microscope slides. They are temperature resistant from 121°C to ?40°C and withstand autoclaving, boiling water baths, freezer temperatures, organic solvents and caustic agents. For best adhesion it is recommended that siliconized surfaces be avoided. Tough-Tags are perfect for accurately identifying important samples stored in tubes, microplates or boxes that will be autoclaved or stored in moderate freezer temperatures.