Induction Seal or Foam Liner? How to Choose
Every child-resistant cap has a liner inside it, and the liner decides how the bottle seals. There are two common types: an induction foil seal and a foam pressure-sensitive liner. Both go in the same cap. The right one depends on how you cap your bottles and where they go after they leave your hands.
Induction foil seal
An induction foil seal is a thin aluminum foil disc inside the cap. After the cap goes on, an induction sealer heats the foil for a moment and bonds it to the bottle rim. The mouth of the bottle is now sealed under the cap.
It gives you a tamper-evident seal. The foil has to be peeled or punctured to reach what is inside, so anyone can see at a glance whether the bottle has been opened.
It holds liquids. Because the foil is bonded to the rim, it keeps liquid medication in even if the cap works loose in a bag.
It needs an induction sealer. Induction sealers work with foil-lined caps only, not foam or pressure-sensitive liners.
Foam pressure-sensitive liner
A foam liner is a 1.0 mm LDPE foam disc. It seals against the rim when the cap is tightened, and it re-seats every time the bottle is closed. No sealer, no heat, no second step.
It is quick. The seal happens as part of capping, which suits hand capping at a pharmacy counter.
There is no equipment to buy or keep running.
It is a reliable barrier, not a record of first opening. If you need to see whether a bottle was opened, choose the foil seal.
How to choose
Choose the foil seal for bottles that leave your building, travel, or hold liquid medication.
Choose the foam liner for hand capping without an induction sealer on the bench.
You do not have to pick one for everything. Bottles and caps are separate line items, so many pharmacies run both and match the cap liner to the use.
Sizes
Both liners come on our 28-400 child-resistant cap, which fits our 30cc and 45cc medicine bottles. Our 60cc bottle takes a 32-400 cap. Caps ship 2,000 to a case. These wide mouth packer bottles hold tablets, capsules, powders and liquid medication.
Who uses them
Pharmacies and compounding pharmacies · hospital and health-system pharmacy · long-term care and skilled nursing · home health and hospice · urgent care and physician offices · correctional health · veterinary practices
