Why air bubbles matter In a dropper, the glass pipette draws liquid up when you release the teat. If air gets in, the pipette holds less liquid than it appears to, and the dose is less accurate. With a graduated pipette, bubbles also make the marking harder to read. Most bubbles come from technique, but…
Introduction A glass pipette for a dropper and a Pasteur pipette look similar, because both are narrow glass tubes with a tapered tip. They are made for different jobs, though. This article explains how they differ and which one suits which application. What is a Pasteur pipette? A Pasteur pipette is a simple laboratory tool…
Why residue builds up Oils, resins, sugars and dried product can collect inside the narrow bore of a glass pipette and around the tip. Left in place, they can block the flow, make dosing less accurate and contaminate the next product. Cleaning works best if you know what the residue is made of. Before you…
Overview The two names sound similar, but the tools do different jobs. A glass dropper pipette is part of a dropper closure on a bottle and dispenses liquid by the drop or in approximate doses. A micropipette is a laboratory instrument for measuring and transferring precisely set volumes. This article explains how they differ and…
To clean a glass pipette with dried-on residue, soak it in warm water with detergent or in a suitable solvent for the residue type, flush it repeatedly by drawing and releasing liquid, then rinse thoroughly with purified water and dry it. Patience works better than force, because scratching or chipping the glass makes future cleaning…
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 terms “Pasteur pipette” and “glass pipette for droppers” are often mixed up, because both are thin glass tubes that draw up and release liquid with a rubber bulb. They are made for different purposes, though. A Pasteur pipette is a laboratory tool. A dropper pipette is one component of a bottle closure, used…
Why air bubbles matter Air bubbles in a dropper pipette reduce the amount of liquid drawn up, so doses become less consistent. This is most noticeable with graduated pipettes, where the fill level is read against a scale. Most bubbles come from filling technique, the liquid itself or a poorly fitting part, and all of…
A used dropper is made of several materials: a glass pipette, a rubber or elastomer teat and a collar. Each part is disposed of differently, and the thin glass of a pipette can break easily and cut. This article explains how to handle used pipettes safely and which rules to check first. Why disposal needs…
Short answer Glass pipettes can be used in sterile applications, but only if sterility is achieved and maintained by a validated process. Glass withstands heat and cleans well, so it suits several sterilisation methods. A pipette is not sterile just because it is made of glass, and an assembled dropper is a different matter again,…
AI assistant – answers may contain mistakes. Prices and stock are checked live in the shop.
