Short answer There is no fixed number. A dropper bottle does not dispense a set number of drops per squeeze, and the number of drops per millilitre depends on the liquid and the dropper. As a rough reference, water-like liquids give about 20 drops per millilitre, or around 0.05 ml per drop. Thick, oily or…
Introduction An empty glass dropper bottle has no expiry date in the usual sense, because glass does not degrade on a shelf. What has a limited life is the liquid inside and, over time, the rubber teat and other closure parts. This article explains which factors set the practical shelf life of a filled dropper…
Introduction Dropper bottles store and dispense small amounts of liquid. They are used for essential oils, tinctures, cosmetic serums, oral drops and other liquids that are applied by the drop. A typical dropper consists of a glass pipette, a rubber or elastomer teat and a collar that fits the bottle neck. This article explains how…
Where evaporation comes from The glass pipette itself does not cause evaporation, and it does not prevent it either. Losses happen mainly where the dropper assembly meets the bottle and where the teat meets the pipette. Volatile liquids such as essential oils, alcohol-based tinctures and some fragrance blends are affected most. Heavier carrier oils lose…
Introduction The teat is the part of a pipette dropper that you squeeze to draw up and dispense liquid. Silicone and NBR (nitrile butadiene rubber) are two common teat materials, and they behave differently. The right choice depends mainly on what the teat will be in contact with and how long the product must stay…
A dropper and a pipette are closely related, but they are not exactly the same thing. A pipette is the general name for a tube used to draw up and transfer liquid, while a dropper is a specific kind of pipette that has a rubber teat and dispenses liquid in drops. In everyday language the…
Pharmaceutical bottles are brown, or more precisely amber, because the coloured glass absorbs a large part of ultraviolet and short-wavelength visible light, which can break down light-sensitive ingredients. Amber glass does not make a product last forever, but it slows photodegradation and so helps keep the contents closer to their intended quality for longer. How…
Droppers come in sizes that match the bottle they fit, and for standard dropper bottles the key size is the DIN18 (GL18) thread. A DIN18 dropper fits DIN18 bottles of 5, 10, 15, 20, 30, 50 and 100 ml, while the glass pipette inside is cut to a length that suits the bottle height. Thread…
AI assistant – answers may contain mistakes. Prices and stock are checked live in the shop.
