Dropper Bottles: 18/410, Glass vs Plastic, and Dose per Drop
By Joe Joo · 8PCK · Shantou · Updated 2026
A dropper bottle is a bottle, a collar and a pipette that have to seal at three points. The 18/410 neck is the standard for serums and oils — the rest is a choice between glass weight and plastic economics.
Serums, oils and tinctures are dosed by the drop, which makes the dropper the product experience rather than a closure. A pipette that drips two drops when the label says one is a complaint waiting to happen.
We supply 18/410 bottles in PET with glass or plastic droppers, and test the assembly as a unit.
Glass vs Plastic
Glass reads premium and is inert — the right choice for essential oils and anything with a solvent. It is also heavier, breaks, and costs more to ship.
PET reads clean and modern, weighs a third as much, and is the pragmatic choice for e-liquid, travel sizes and sample kits. The dropper itself can still be glass in a PET bottle.
Why the Collar Matters More Than the Bottle
The collar holds the pipette and seals against the neck. If it is loose, the product leaks into the cap; if it is over-tight, the pipette cracks. This is the part we test on every batch rather than sampling.
Dose per Drop Is a Specification, Not a Guess
Drop size depends on the bore of the pipette and the viscosity of the liquid. Water-like serums give about 0.05 ml per drop; oils give less. If your label says “3 drops”, test with the actual fill before printing the carton.
Questions We Get on This
Can you supply the dropper separately?
Yes — 18/410 droppers at 1,000 pcs MOQ, glass or plastic, whether or not you buy the bottle from us.
Is a 30 ml dropper bottle really 30 ml?
Nominal capacity is to the shoulder, not the brim. With the dropper inserted, usable fill is typically 25–28 ml — plan the label claim accordingly.
Do you offer child-resistant droppers?
Yes, in 18/410 for CBD and essential oil markets where the destination market requires it.
Can the pipette be printed with a logo?
On the bulb or the collar, yes. Printing on the glass pipette itself is not practical at these volumes.
Sizes That Fit This Guide
Get a Price on This, in 24 Hours
Tell us the capacity, the neck and the quantity. You get unit price, lead time and a sample plan — not a catalogue.
Every batch is gauged at the neck and weighed. The documents travel with the shipment.