Plastic test tubes with a screwtop cap are often called 'Falcon tubes' after a line manufactured by Becton Dickinson. Culture tubes for biology are usually made of clear plastic such as polystyrene or polypropylene by injection molding  and are often discarded after use. By tilting the tube, the bottom can be heated to hundreds of degrees in the flame, while the neck remains relatively cool, possibly allowing vapours to condense on its walls. Test tubes are usually placed in special-purpose racks. Test tubes are sometimes put to casual uses outside of lab environments, e.
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