Wide-Mouth Bottle, PTFE FEP bottle, Tefzel ETFE screw closure The extraordinary chemical and temperature resistance of PTFE FEP, with the convenience of a wide mouth are combined in this bottle. These virtually clear, autoclavable bottles are ideal for high- or low-temperature work, trace metal analysis and applications with organic solvents. Bottles with closure withstand temperatures from -105°C to +150°C. Packaged individually. Autoclavable/Leakproof† . NOTE: Before autoclaving, just set cap or closure on top of the container without engaging the threads.