Large amber polypropylene bottle with polypropylene screw closure. Excellent chemical resistance to most acids, bases and alcohols. For storing chemicals and standards, collecting and storing distilled water. The 4-and 8-liter sizes (Cat. Nos. B6762-4 and B6762-8) have a built-in shoulder loop for attaching an identification tag. B6762-2 comes without shoulder loop. Amber PP to help protect light-sensitive materials. NALGENE amber bottles comply with U.S. Pharmacopoeia 23, 661 requirements for maximum allowable light transmission. These containers can be used for long-term storage, but direct UV exposure should be avoided. NOTE: Before autoclaving, just set cap or closure on top of the container without engaging the threads. Good for freezer storage to -100°C.