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).