Why teat cleaning matters The teat is the part of a pipette dropper that you squeeze to draw liquid into the glass pipette. It is in contact with the pipette and often with the contents, so residue on it can affect the next fill. This guide covers how to clean teats for DIN18 (GL18) droppers…
Short answer Sometimes. Whether a teat can be sterilised depends on its material, the method used and how many times the process is repeated. Rubber and elastomer teats differ in how well they tolerate heat, steam and chemicals, so there is no single method that suits every teat. The material specification or the supplier’s guidance…
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…
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…
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…
Why handling matters A glass pipette is the part of a dropper that touches the liquid, so any residue, dust or skin contact on it can end up in the product. Contamination can change the contents, give inaccurate dosing and cause cross-contamination between products. The rules below apply to laboratory work, filling lines and everyday…
Why cleaning matters Residues of oils, extracts or cosmetic formulations can change the amount a pipette draws up, carry over into the next product and make the glass cloudy. This guide covers how to clean a glass dropper pipette for reuse and what to do with the other dropper parts. Before you start Separate the…
Most problems with droppers for pharmaceutical and similar bottles can be fixed by checking four things: the seal between collar and bottle, the fit of the pipette and teat, the compatibility of the teat with the liquid, and the user’s technique. Leaks, weak suction, dripping and sticking caps usually have a simple cause once you…
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