Nontoxic, biologically neutral. FDA/BGA approved. For test tubes. Easy to install. Good chemical inertness and sterilizable. Suitable for temperatures between -60° and 220°C. Size refers to the outside diameter of the tube or flask to be closed.
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Colonial Scientific has teamed up with the industry leaders, Fisher Scientific and VWR, and now offers their entire product line. Colonial Scientific provides any part from the Fisher Scientific site with a part number.