Black Plastic Cap with Inner Dropper, 28/410

The 28/410 plastic dropper cap is a drop-dosing closure for bottles and vials with a 28/410 type neck. It combines two functions in one piece: it seals the bottle and at the same time lets you dispense the contents precisely, without spilling and without swapping the dropper and cap after every use. It is especially suited to liquid products dosed in small amounts – tinctures, herbal extracts, oil blends, bath concentrates or diluted fragrance compositions. The black colour matches both brown and black bottles, and on clear glass it works as a contrast.

The cap is made of polypropylene (PP), a light and durable plastic commonly used for closures for both cosmetics and food. The closure has certification for direct food contact as well as suitability for cosmetic products, so it will serve for homemade oils, syrups, vinegar or spirit extracts just as well as for cosmetics.

How the dropper works

Under the screw-off cap there is a dropper with a narrow opening, through which the contents flow out drop by drop when the bottle is tilted, instead of in a continuous stream. With a plastic bottle you can help by gently squeezing the walls; with a glass one it is enough to tilt it and, if needed, lightly tap the bottom. The size and pace of the drops depend on the viscosity of the contents. Thin liquids (alcohol tinctures, hydrosols, aqueous solutions) drip quickly, thicker oils more slowly and in larger drops. For very thick products, such as syrups or viscous serums, the dropper is not a suitable dosing method and a pump will serve better.

After taking a dose you simply screw the cap back on, with the dropper remaining in the bottle. The contents are thus not needlessly exposed to air and the bottle can be safely stored or carried.

Key features

• Drop-by-drop dosing – lets you take small amounts precisely, which will be appreciated especially by users of tinctures, extracts and concentrates.
• Closure and dropper in one – no need to open and decant the bottle, or to swap two different closures.
• Food and cosmetic certification – the same closure will serve for both kitchen and cosmetic products.
• Durable and light – suitable also for bottles that are often carried around.
• Black colour – a neutral look that suits both dark and clear bottles.

Which bottles it fits

The cap fits all bottles and vials with a 28/410 neck, that is, with a neck diameter of 28 mm. This is a widespread size found on larger plastic and glass bottles. You will find bottles with the same neck type as well as ready-made bottle + closure combinations in the Handymade range. For your own combination we recommend checking the tightness, the behaviour of the dropper with the specific contents, and whether the bottle neck matches not only in diameter but also in height.

Which products it suits

• Herbal tinctures and spirit extracts – thin, dosed drop by drop.
• Oil blends and body oils – for dosing into the palm or the bath.
• Concentrates and aromatic blends for diffusers – if diluted in a carrier oil or alcohol.
• Homemade food products – flavoured oils, vinegars, herbal syrups of thinner consistency.

Good to know

Before first use we recommend to wash, rinse with clean water and disinfect both the cap and the dropper with isopropyl alcohol or ethanol, then let them dry completely. This applies especially when filling cosmetics without preservation or food.

The cap can be reused if you thoroughly clean the dropper after emptying the bottle. When changing the contents (for example from oil to tincture), bear in mind that the narrow opening is harder to clean than a smooth cap.

Polypropylene is a recyclable plastic and at the end of its life belongs in separated plastic collection according to the rules in your locality.

Frequently asked questions