Tubes feature a protective polymer coating for longer product life and safety. Protective coating helps prevent glass from shattering and reduces spills. Autoclavable (121°C) and resistant to thermal shock. Furnished with deep-form phenolic caps to facilitate handling and sealing. Caps are autoclavable and feature glued-in, white rubber liners. Do not place over direct heat or flame, moist heat above 121°C or dry heat above 110°C.