Plastic Bottle Caps — Child-Resistant

Neck finishes

Two sizes cover the range. The 28-400 fits our 30cc and 45cc bottles — one cap across two bottle sizes. The 32-400 fits the 60cc only. Match on neck finish rather than bottle size when checking against capping or sealing equipment, since the neck is what the machine engages with.

Choosing a liner

This is the decision that matters, and it is operational rather than technical.

A foam liner seals the moment the cap is applied. No induction sealer, no heat, no second operation — the practical default where capping happens at a counter, where volumes are moderate, or where sealing equipment cannot be justified.

A foil induction seal does one thing foam cannot: it shows whether the container has been opened. The foil bonds to the bottle rim and cannot be lifted and replaced without leaving a mark. It requires an induction sealer, which is a real purchasing constraint worth naming before you order.

Certification and materials

Each closure is tested together with the bottle it fits, as a package system, to 16 CFR 1700.15 and 1700.20 and to ISO 8317. Testing is performed by Unitec Laboratory Services, an ISO/IEC 17025-accredited independent lab — the cap alone is not child-resistant on its own; certification belongs to the bottle-and-closure pair as tested together. These are natural HDPE plastic bottle caps, tested to FDA food-contact standards under 21 CFR 177.1520 and 175.300, the same standard applied to the bottles themselves.

Ordering child-resistant packaging by the case

Closures are sold by the case, matched to the bottle they close: the 28-400 foam or foil cap fits our 30cc and 45cc packer bottles, and the 32-400 fits the 60cc. Buying a case of caps and a case of matched bottles together means nothing is left over on either side. There is no minimum order beyond one case, and free sample packs are available so you can confirm fit and finish — foam or foil, 28-400 or 32-400 — before committing to a volume.

Who orders these

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, and veterinary practices all specify a neck finish and liner type when they order bottles for dispensing, then reorder closures on the same schedule as the bottles.