FEA sizes, crimp control & glass quality at the neck
Five things that decide whether a crimped fragrance pack holds for two years.
Fine fragrance bottles use FEA necks, where the pump's aluminum ferrule is rolled down over a formed glass bead. There is no thread. That makes the bead profile the critical dimension on the whole bottle, and it means the assembly is permanent — the reason fragrance houses treat the neck and the pump as one specification rather than two.
FEA identifies the bead, not just the diameter
FEA 13, 15, 18 and 20 describe fragrance neck standards where the collar runs slightly wider than the nominal size — around 16.3 mm on FEA 15, for instance. The number defines a bead profile the crimp jaws grip. Specifying a bottle as simply a 15 mm neck leaves that profile undefined, which is where mismatched samples come from.
Neck glass quality matters more than body quality
The crimp applies real force to a small area of glass, so a neck with a heavy seam, an out-of-round bead or thin distribution is where cracks start — sometimes in the machine, sometimes weeks later in a warehouse. Neck inspection deserves tighter attention than the body of a fragrance bottle, however decorative the body is.
Crimp force is proved on your own glass
Too little and the pump loosens and the fragrance evaporates over months; too much and the shoulder cracks. The setting is established on the bottle actually being used and re-proved whenever the glass supplier or mold changes, because bead dimensions vary between sources even at the same nominal FEA size.
Permanent assembly changes the cost of a mistake
Because the pump cannot be removed without damage, a filled bottle with a fault is scrap rather than rework. That raises the value of getting fill, crimp and inspection right first time, and it is why fragrance lines run tighter in-process controls than most cosmetic filling operations do.
The overcap is a design object with a functional job
The cap is what a customer handles most and it also protects the actuator from accidental spraying in a bag. Weighted caps in metal, wood or resin carry much of a fragrance's perceived value, and they have to fit the collar rather than the neck, which is a different dimension and a separate approval.
Once crimped, the fill is fixed, so the fragrance has to be final
There is no way to open a crimped bottle without destroying it, which means every unit filled before a formulation is signed off is scrap. The sequencing that follows is the real constraint on this format: fragrance approval comes first, always.
