Dropper Assemblies with Rubber Bulb

A dropper assembly turns a bottle into a precise drop-dosing system. Squeezing the rubber or silicone bulb draws liquid up the glass pipette, and releasing it dispenses controlled drops; the screw collar holds the assembly on the bottle and its liner seals the bore between uses. It is the standard closure for serums, oils, tinctures and liquid medicines dosed by the drop.

Pipettes can be plain or graduated with calibration marks for measured dosing, and collars come in child-resistant versions for products that require them, so the same basic assembly serves cosmetics, supplements and pharmaceuticals.

Facial serums and oils, essential oils and tinctures, CBD and herbal extracts, pharmaceutical and homeopathic drops, cosmetic actives, aromatherapy blends, flavor and food drops, and pet or veterinary drops.

A glass pipette (plain, graduated, bent or ball-tip), a nitrile or silicone bulb, and a screw collar (PP or aluminum-shelled) with a sealing liner, sized to standard dropper necks including the 18 mm Euro neck. Standard and child-resistant collars are available; the bulb color and collar finish are part of the look.

Match the collar to the bottle neck and the pipette length to the bottle so it reaches the liquid. Confirm bulb material compatibility with the product — citrus and other essential oils degrade some rubbers, so silicone bulbs are used for them. Headspace must allow the pipette to enter without overflow, and the collar liner must seal to prevent leaks and evaporation.

The glass pipette is drawn and cut (and printed if graduated), the bulb is molded from nitrile or silicone, and the collar is molded and lined, then the parts are assembled. Pipette length and tip consistency, bulb compatibility and collar seal are the key quality checks.