Liners and closures

What a liner is for

Sealing against the land of the neck finish, and doing it without being attacked by the contents. A pulp or plain foam liner that is fine over a cosmetic will swell, break down or contaminate against a solvent or an amine.

The two that are serious about chemicals

F217 is a foamed polyethylene core between two solid layers and is the common general chemical liner. A polycone, where a cone of the cap material seals into the neck rather than a separate disc, removes the liner question by having no separate liner at all and seals well on thin liquids.

Which of them we publish

Liner is recorded on part of the range rather than all of it, and on this shelf the closures carrying F217 and polycone are a minority of what is there. Where it is published it is on the container page; where it is not, that is a question for us rather than an assumption to make.

Neck finish decides what fits

Not diameter by eye and not the look of the thread. Every container page lists the closures verified against its own neck, which matters more here than in the food properties because the cost of a wrong match is a leaking chemical rather than a stale product.

Vented and child-resistant closures exist for a reason

Some products off-gas slightly in storage and some ought not to be easy for a child to open. If what you are storing warrants either, that is a closure specification rather than an afterthought.

Label the decanted container

The moment chemical goes into a container that is not its original, the original label is gone and so is the hazard information. That is the subject of the labeling section and it starts here, at the bench.

References