Nalgene 1630 Narrow-Mouth Teflon™ PFA Bottles with Caps are the most temperature-resistant, chemical-resistant, corrosion-resistant containers available. PTFE PFA is inert to virtually all chemicals except molten alkali metals, fluorine at elevated temperatures and certain complex halogenated compounds at elevated temperatures and pressures. Bottles with closure withstand temperatures from -270° to 250°C. Translucent bottles allow liquid levels to be seen. Linerless, leakproof closure made of PTFE PFA for a positive seal. Packaged individually.