Jun 18th 2025
Pipette Lengths for your Dropper Caps
The last thing you want is wasted product. That’s why it’s important to ensure your pipette is the correct length for your bottles, whether it’s housing essential oils, skincare serums, or medications. A properly sized pipette will reach near the bottom of the bottle, but will not touch it. This allows you to get as much product as possible, minimizing waste while doing so.
The guide below shows the optimal pipette length for Boston Round bottles and Euro bottles.
More About Boston Round Bottles
- Popular choice for liquid packaging due to their classic shape and closure compatibility
- Typically paired with straight-tip glass pipettes for easy, precise dispensing
- Commonly sized in imperial measurements: 0.5 oz, 1 oz, 2 oz, etc.
- Common neck finishes: 18-400, 20-400, and 22-400
- Each bottle size requires a matching dropper assembly for secure, leak-free use
More About Euro Bottles
- Often use pipettes with bent or ball tips for improved control, especially with thick or potent liquids
- Sizes based on metric system: 5 ml, 10 ml, 30 ml, etc.
- Standard neck: 18mm DIN finish designed for Euro-style caps
- Typically used with dropper inserts and tamper-evident caps
Pipette Markings
Clear, legible markings help ensure users draw the right amount every time. Depending on the material and style of the pipette, markings may be embossed, printed, or laser-etched—each offering different levels of visibility and durability.
- Laser-Etched Glass: These markings are burned into the glass so they remain permanent. They’re super precise and great for things that need to be measured exactly, like in science or medicine.
- Embossed Plastic (PP): These markings are raised up from the surface so they won’t rub off easily. They’re great for everyday products like cosmetics and medicine bottles. Just keep in mind—they can be tough to see in darker places.
- Printed Lines on Glass: These are easy to read and helpful for measuring things accurately, which is why you often see them on skincare bottles or in labs. A lead-free amber ink is used to meet FDA safety guidelines. It’s printed on pipettes and heat-treated so it bonds to the surface and stays clear through regular use.
Choosing the Right Dropper
The very first thing to check is that your dropper’s pipette is the right length for your bottle. If it’s too short, it won’t be able to reach all the liquid. If it’s too long, it may bend or not seal properly. Getting the right fit helps make sure your product is used efficiently and keeps waste at a minimum.
Once you figured out your pipette’s length, consider markings to help users measure and dispense their products with precision. This is especially useful for serums and tinctures.