Teflon® FEP. With ETFE screw cap. The extraordinary chemical and temperature resistance of Teflon® FEP, with the convenience of a wide mouth. 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 to + 150 °C. Autoclavable, leakproof. Teflon® FEP. With ETFE screw cap. The extraordinary chemical and temperature resistance of Teflon® FEP, with the convenience of a wide mouth. 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 to + 150 °C. Autoclavable, leakproof.