Glass Dropper Bulb Function

The bulb in a glass dropper system creates the pressure change that draws liquid into the pipette and later releases it. Squeezing expels air; releasing while the tip is submerged allows atmospheric pressure to push product up the tube. Bulb material, wall thickness, elasticity, and recovery affect suction strength, dose consistency, and how quickly the pipette refills. Its fit on the collar or closure also influences seal integrity and leakage. Because bulb performance interacts with pipette diameter, formula viscosity, and user technique, buyers should assess it as part of the full dropper assembly rather than as an isolated component.