Plastic cap with tamper-evident ring and dropper, 18 mm, white ribbed

A plastic cap with tamper-evident seal and dropper insert, 18 mm, is a ready-to-use closure for glass vials with an 18/410 neck. It combines two things that come up most often when filling vials: drop-by-drop dispensing and a first-opening seal. The clear dropper insert fits into the vial neck and the contents then flow out slowly and in a controlled manner. The white ribbed cap closes the vial, and its tamper ring shows whether it has already been opened.

Suitable for liquid products where precise quantity matters and which are sold in smaller glass vials. The set is declared suitable for contact with cosmetics; it is not approved for contact with food.

Key benefits

• Drop-by-drop dispensing – the dropper insert with a narrow opening releases one drop at a time when the vial is tilted. This makes it easier to follow a formula and prevents spilling more than needed.
• First-opening seal – on first unscrewing, the tamper ring separates from the cap and remains on the neck. Both customer and manufacturer can see that the product was not opened before purchase.
• Ribbed surface – the grooves around the cap make opening easier even with wet or oily fingers, which is particularly useful when working with oils.
• Long dropper insert – a longer version of the dropper designed for glass vials with an 18 mm neck; contents are dispensed only through the dropper opening.
• Ready-made combination – the cap and dropper insert are matched to the same neck type, so there is no need to test whether the dropper fits the vial and whether the cap seals above it.

How to use the set

Fill the vial with its contents, press the dropper insert into the neck by hand until it reaches its collar, then screw on the cap. The dropper must sit straight and fully in the neck; otherwise the cap will not seal and the contents may leak during transport. When screwing on for the first time, tighten the cap so that the tamper ring clicks under the neck. This click ensures that the ring will break off when the cap is opened.

Dispensing is done by tilting or turning the vial upside down. The drip rate depends on the viscosity of the contents: thin essential oils and alcohol tinctures drip quickly, thicker oil serums more slowly. Very thick contents, such as blends with a higher proportion of thickeners or butters, barely flow through the dropper insert and are better suited to pumps or jars.

Suitable for products such as

• Essential oils and their blends – the traditional use of a dropper, dispensing into a diffuser or into a carrier oil drop by drop.
• Perfume compositions and fragrance oils – measuring out a precise number of drops into soap, a candle, or a cream.
• Oil serums for face and hair – small daily amounts where a pump often dispenses too much.
• Tinctures and alcohol extracts – dispensing drop by drop into water or into a formula.
• Samples and testers – small vials with a first-opening seal appear trustworthy as samples and the contents do not spill during testing.

Good to know

The cap is made of polyethylene (PE), the dropper insert of polypropylene (PP). With concentrated essential oils, especially citrus ones, and with solvents, it is advisable to check the behaviour of the dropper insert with the specific formulation. Some components may soften the plastic over time or extract its scent. A simple test is to fill one vial, leave it for a few weeks at room temperature as well as in a warmer spot, and check the seal and the appearance of the dropper insert.

Before the first use, we recommend washing the cap and dropper insert, disinfecting them with isopropyl alcohol or ethanol, and allowing them to dry completely. Moisture trapped in the dropper insert would enter an anhydrous product and could degrade it.

The dropper insert can be removed from the neck after use and cleaned. With sticky contents, such as resins or thick fragrance oils, the opening can easily become blocked and cleaning is laborious. For such contents it is more practical to replace the dropper insert with a new one.

The white colour of the cap has no effect on protecting the contents from light; that is the responsibility of the vial material. For oils and essential oils sensitive to light, choose a brown or blue glass vial with the same neck type. Vials with an 18/410 neck and further ready-made combinations are available in the Handymade range; when using your own combination, we recommend checking the seal and dispensing performance with the specific formulation.

Both the cap and the dropper insert belong in sorted plastic waste. Before disposal, simply pour out any remaining contents and rinse the parts.

Frequently asked questions