Wide-Mouth Bottle PTFE FEP, ETFE screw closure. The extraordinary chemical and temperature resistance of PTFE FEP, with the convenience of a wide mouth. These 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. NOTE: Before autoclaving, just set cap or closure on top of the container without engaging the threads.