How to Choose a Perfume Bottle Cap – Neck, Size, Weight and Fit

To choose a cap for a perfume bottle, start with the bottle: identify the neck type and the pump, measure the height of the pump above the shoulder and the diameter of the bottle, then decide what weight and proportions you are looking for. The cap should go on with slight resistance, should not rotate, should not press the pump button and should not make the bottle unstable. The final decision is made after a sample on the actual bottle.

Start with the bottle, not the cap

The most common mistake is to choose a beautiful cap and then look for a way to "attach" it to the bottle. The cap is the last element of the bottle – pump – cap system and depends on the other two. Before talking to a manufacturer, prepare:

• a sample of the bottle with the pump fitted, or at least a technical drawing with dimensions;
• the type of pump – crimped or screw-on – and its model;
• the height of the pump including the button (actuator) above the shoulder of the bottle;
• the outer diameter of the neck and of the pump's metal ferrule;
• an idea of the shape and colour, and the logo in vector format.

The bottle neck and the pump type

Crimp neck

On most spray perfumes the pump is crimped – its metal ferrule is pressed tightly around the rim of the neck. These necks follow the FEA standards (European Aerosol Federation). The most common are FEA 13, FEA 15, FEA 18 and FEA 20, with the number corresponding approximately to the neck diameter in millimetres. FEA 15 is especially widespread on classic bottles, while FEA 18 and larger are used on more substantial bottles. For the cap, this means that the insert must be sized to the ferrule of the specific pump, not just to the glass.

Screw neck

Screw necks are found on perfume oils, refill bottles and many cosmetic products. They are designated by two numbers – diameter and thread type, e.g. 18/415. Here the cap must have a thread that exactly matches the neck, and tightness is ensured by a seal. If your bottle has a screw neck, send the exact designation or a sample.

Where the cap "sits"

A push-on cap can grip the pump ferrule or rest on the shoulder of the bottle. The first option is more universal; the second gives a tighter visual connection between the glass and the cap. In both cases there must be free space inside above the pump button – otherwise the perfume will spray when the cap is put on.

Size and proportions

The size is determined by two things: the technical minimum – the cap must cover the pump – and the visual balance. A low cap on a tall bottle looks clean and modern; a tall cap on a short bottle creates an accent and a jewel-like feel. It is useful to compare the options with a mock-up or a 3D rendering before approving the shape.

If the line includes several sizes of one fragrance, decide whether the cap will be the same for all bottles or scaled proportionally. A single cap simplifies production, while a scaled one emphasises the product family.

Weight and balance

Weight is a strong signal of quality – the customer "feels" the value in their hand. But the weight must be measured:

• zinc alloy gives the greatest weight and is suitable for low, stable bottles;
• aluminium is light and suitable for narrow, tall bottles;
• polyester is lighter than zinc alloy and allows large shapes without excessive weight;
• a combined cap lets you add a metal accent without making the whole cap heavy.

A heavy, tall cap moves the centre of gravity upwards and the bottle tips over more easily. In addition, if dropped, a heavier cap puts more stress on the neck and the pump. Check the stability of the bottle on an inclined surface and when opening it with one hand.

Fit: the role of the insert

The insert is the inner plastic part that holds the cap in place. A good fit means:

• the cap goes on with slight, even resistance;
• it does not rotate freely or tilt;
• it comes off with one hand without lifting the bottle;
• it does not loosen after repeated opening and closing;
• it does not press the pump button or scratch the ferrule.

Glass bottles have larger tolerances than metal parts, so the fit is always checked on several bottles from a real batch, not just on one.

Checklist before approval

Caps for cosmetics and home fragrances

The same principles apply beyond perfume. On cream jars the cap is screw-on and must close tightly so that the product does not dry out. On dropper serums and home diffusers the neck is often narrower and the cap taller, which makes balance even more important. If a brand is developing a whole line, it is useful to plan from the start one cap shape that can be scaled to the different packs, rather than deciding each one separately.

The sample: the step you do not skip

Whatever drawings exist, the final decision is made with a sample on the actual bottle with the pump fitted. The sample is used to check the fit, the weight, the colour under daylight and artificial light and the details of the logo. If the product will be sold in a box, also place the bottle with the cap in the insert of the perfume box – sometimes a larger cap requires a change to the packaging as well.

Common mistakes when choosing

• the cap is designed from a photo, without the pump dimensions;
• no space is left above the button and the cap sprays fragrance when closed;
• a cap that is too heavy is chosen for a narrow, tall bottle;
• the colour is approved on screen only, without a physical sample;
• the box is ordered before the cap has been finally approved.

Made-to-measure caps from Polkom

Polkom is a manufacturer of perfume accessories – metal caps in any metal colour and polyester caps in any Pantone colour, in any size and shape and with your logo. We adapt the cap to the neck of your bottle and prepare a sample before the production run. Minimum quantities depend on the article – send an inquiry with the bottle or its drawing.