Filling
When filling your product avoid getting any liquids on the rim, as this can create lubrication between the bottle/jar and closure.
For oil-based products, a dry fill is recommended. Even if oil on the rim is wiped away, residue can remain and affect the closure over time, potentially causing the lid to loosen or “unwind.”
It’s also important not to overfill your container. For more guidance, see our page “What is the correct fill point for a bottle?”
Closures
Some bottles/jars have many closure options to meet different needs:
Wadded caps
Wadding refers to a liner inside the cap, often made from foam, that provides an additional barrier against air and leakage. It may be a separate insert or integrated into the cap as a built-in component.
Wadding is recommended for liquids or products sensitive to air and moisture exposure.
Plastic vs Aluminium
Aluminium closures are naturally malleable and can deform if over-tightened or impacted, which may compromise their seal.
If your product is likely to be transported frequently or handled in transit, a plastic closure may offer more durability.
Droppers
For oil-based products, we recommend using Dripulator bottles with the OV3 droppers. These are specifically designed for oils and preventing ‘unwind’ (see above under filling).
Metal Twist Caps
See our page “Applying metal twist caps” for advice on creating a proper seal.