Dropper bottle
A dropper bottle is a (mostly smaller) bottle made of glass or plastic with which individual drops of a liquid contained in it can be dispensed. They are mainly used for liquid drugs (pain relievers, eye drops , nasal drops, etc.), but also for reagents , e.g. B. when analyzing water ( aquarium , rivers, ponds, lakes, sewage, etc.)
Bottles with a screw-in pipette , which is designed as a " normal drop counter ", and special inserts in the neck of the bottle, which allow individual drops to flow out when the bottle is held vertically with the opening facing down, are common.
Plastic dropper bottles usually have a pointed attachment with a narrow diameter, which releases drops when the flexible bottle is squeezed (tip down).
Dropping bottles with pipettes made of soda-lime glass are also offered in the laboratory equipment sector. A dropping pipette with a rubber cap is integrated in the standard ground joint (NS) stopper. They are available in clear glass and amber glass with a volume of 50 or 100 ml. The rubber cones are made of natural rubber (NR) and are suitable for all sizes.
There are also dropper bottles made of PE-LD (low-density polyethylene), are flexible and have a screw-off dropper attachment with an attached nipple for closing. They are offered with volumes of 20, 30, 50, 100, 250, 500 and 1000 ml. The matching and interchangeable drip attachments have threads GL 14, GL 18, GL 25 and GL 28.
Dropper bottles made of PTFE (polytetrafluoroethylene) are flexible, have excellent chemical resistance and have a dropper with a screw cap. They usually have a volume of 25 or 50 ml.
Dropper bottles made of glass with a conical ground glass stopper with grooves are opened for dripping by turning the stopper so far that the short grooves on the cone shells overlap and complement each other so that (mostly) two channels that lead from the inside to the outside through rich, be trained. While a finger or thumb presses the stopper into its seat, the bottle is tilted by more than 90 ° and some liquid runs through the lower tubule to a laterally protruding then downward nose of the knob on the stopper, from where a drop falls off or can be stripped off. Typical volumes are 10 to 100 ml.
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Individual evidence
- ↑ Gerhard Meyendorf: Laboratory Equipment and Chemicals , People and Knowledge Volkseigener Verlag Berlin, 1965, p. 219.