Tropferkappen

Tropferkappen are small closures designed to fit onto droppers or bottlenecks of bottles that are used to dispense liquids dropwise. They serve primarily to seal the container, protect the tip of the dropper, and prevent contamination or spillage. Depending on the application, Tropferkappen may also help preserve the contents by reducing evaporation.

The term is used in several contexts and the exact design can vary. In laboratory, pharmaceutical, and cosmetic settings, Tropferkappen are commonly made from plastics such as polypropylene or polyethylene, or from silicone. They can be screw-on caps, snap-fit caps, or rubber stoppers that fit into the neck of a bottle or onto a glass dropper. In gardening and irrigation contexts, similar caps may be used to protect drip emitters or droppers during transport or storage and to keep dirt and debris out of the outlet.

Typical features include compatibility with standard bottle or dropper sizes, durability under typical storage conditions, and chemical resistance to common reagents. Properly fitting Tropferkappen help ensure hygienic dispensing and reduce the risk of leaks or contamination.

Care and maintenance involve keeping the caps clean, inspecting seals for wear, and replacing damaged parts to maintain an effective seal. The specific choice of cap depends on the bottle neck finish, the dispensing needs, and the environment in which the dropper is used. See also: dropper bottle, cap, irrigation emitter.