Dropper pipette cap DIN18

01 · WHAT DIN 18 IS

It is the neck thread, not the bottle size

DIN 18 is a neck standard: it fixes the diameter and thread pitch of the bottle's mouth. That means any bottle with a DIN 18 neck takes this closure, whether it holds 20, 30 or 50 ml — capacity plays no part in the fit. It is the same logic as twist-off lids: the neck decides, not the container. Before ordering quantity, check the reference of your bottles or measure the neck; if yours is another thread, this closure will not do however well the capacity matches.

02 · WHY THERE ARE THREE MODELS

Chosen by the bottle's height, not the liquid

The three models — 20, 30 and 50 ml — do not change the thread or the diameter: what changes is the length of the tube. And that is the selection criterion, which is not obvious: the tube has to reach the bottom of the bottle. A short one leaves product stranded in the base and forces you to tilt it; a long one in a shallow bottle bends against the bottom and draws badly. So you choose by the internal height of your bottle, not by what goes inside it. The ribbed cap helps opening and closing with thin gloves or damp hands, which is normal when filling batches.

03 · BEFORE YOU BUY

Sold singly, with the model chosen from the dropdown. And the limit that has to be respected: according to the product documentation, it is for cosmetics and non-food derivatives. If what you are packing is ingested — a tincture, an extract for consumption — ask us first and we will tell you which closure applies: it is not a formality, it is what will be required of you if you sell.