These heavy-duty bottles can be used for storage as well as mixing and sampling. A protective PVC coating helps prevent glass from shattering and reduces spills. Resistant to thermal shock. Bottles come complete with autoclavable, one-piece, colored, polypropylene plug seal screw cap with drip-free pouring ring, graduations and marking spot. Glass bead indicates full capacity line. Do not place over direct heat or flame. Do not heat above 121°c (248°f) moist heat or 110°c (230°f) dry heat. Autoclavable (121°c/248°f). replacement caps and pouring Rings are available (sold separately). protective PVC coating prevents glass from shattering.