Glass Dropper, Silver Black, 71 mm

A dropper is a cap with a glass tube and a squeeze bulb that dispenses liquid cosmetic preparations drop by drop. It is suitable for serums, facial oils, oil blends with active ingredients and tinctures – wherever a few drops need to be measured out rather than poured from the neck.

The dropper screws onto bottles with an 18/410 thread. The glass tube withstands both oily and alcohol-based contents, the silicone bulb retains its elasticity with repeated squeezing, and the polypropylene cap holds the tube firmly in the neck.

What you get

• Precise dosing – one squeeze of the bulb draws up a few drops, which you release one by one onto your palm or directly onto skin. With concentrated serums and oils, you won't use more than needed.
• Glass tube – glass does not absorb scents or dyes, won't cloud from essential oils, and can be thoroughly cleaned. After washing, you can use it with different contents without transferring any odour.
• Silicone bulb – resists oils and hardens less over time than ordinary rubber, so dosing stays smooth.
• Hygienic dispensing – the contents are not poured from the neck or scooped with a finger; the tube only touches the liquid inside the bottle.
• Clean appearance – a black cap with a silver collar gives the bottle a neat look and complements both dark and clear glass.

Choosing a bottle and fill volume

Two pieces of information are decisive: the thread type and the dropper length. The 18/410 thread must match the bottle's thread exactly, otherwise the dropper won't seal or cannot be tightened properly. The length of the glass tube should correspond to the height of the bottle: a correctly sized tube reaches just above the bottom, drawing up the contents even when the product is nearly depleted, without resting against or bending at the bottom. A tube that is too long cannot be tightened; one that is too short leaves some of the contents unused.

When filling, it is useful to know the difference between nominal and total volume. Nominal volume is the amount the bottle is intended for under normal filling conditions. Total volume to the brim is the physical capacity right up to the neck. The difference creates a reserve for the tube, which displaces some of the contents when screwed in, and for the expansion of the liquid with temperature changes. The bottle should therefore be filled to the nominal volume, not to the brim.

Suitable preparations

The dropper dispenses liquid and low-viscosity contents: water-based and oil-based facial serums, vegetable oils and oil blends, oil extracts, tinctures and alcohol-based infusions, active ingredient concentrates, and essential oil blends for dilution. It is not suitable for thick serums with a high content of gelling agents, emulsions, or creams. Dense contents will not be drawn into the tube or drip out, and the bulb will be strained unnecessarily.

With water-based serums and hydrolat preparations, the tube remains in contact with the contents. Proper preservation of the formulation is therefore just as important with such products as with any other closure.

Useful information

• Preparation before first use – wash the dropper before use, disinfect it with isopropanol or ethanol and allow to dry completely. No moisture must remain in the bulb.
• Repeated use – the glass tube and cap can be washed and reused. The bulb can simply be rinsed and dried; prolonged soaking in solvents shortens its lifespan.
• Tightening – hand-tighten the dropper. Excessive force will not improve the seal and is more likely to damage the cap thread.
• Transport – before shipping finished products, check that the dropper seals on the specific bottle even when lying on its side. For low-viscosity oils, additional protection with packaging or film wrap is advisable.
• Recycling – this is a multi-material closure. Before disposal, separate the glass tube, aluminium collar, and plastic parts by material.

Frequently asked questions