Why Does Fragrance Oil Come in an Aluminium Bottle?
If you buy fragrance oil by the kilo, you will have noticed that the bottle is metal, not glass. That is not a cost decision; it is a safeguard against the three main enemies of fragrance oil: light, impact and air.
Fragrance oil is a concentrated mixture. Citrus oils, aldehydes and many floral molecules slowly degrade when exposed to light and oxygen: the colour darkens, the top note dulls, and sometimes a sour or metallic off-note appears. An aluminium bottle blocks light completely, does not shatter when dropped, and is far lighter than a glass bottle of the same volume. For a raw material that will travel hundreds of kilometres by courier, those three properties are decisive.
Aluminium is also a material that can be recycled indefinitely. An empty bottle is not waste but a metal with scrap value.
Three Sizes, Three Uses: Dimensions and Closure System
On esans.com.tr the tamper-evident aluminium bottle comes in three sizes. The dimensions are taken from the manufacturer's technical drawing; you can plan shelving, cartons and labels from this table.
| Bottle | Diameter | Height (without cap) | Neck inner diameter | Empty weight | Brimful capacity |
|---|---|---|---|---|---|
| 250 ml (T36255) | 54.8 mm | 155 mm | 21.8 mm | 46 g | 295 ml |
| 500 ml (T36256) | 73.8 mm | 185.5 mm | 27.4 mm | 82 g | 620 ml |
| 1000 ml (T36257) | 88.7 mm | 259 mm | 27.4 mm | 130 g | 1300 ml |
Each bottle closes with a two-part system: a plastic inner plug that seats in the neck, and a tamper-evident screw cap over it. The inner plug provides the seal; the cap has a ring that breaks on first opening, showing that the bottle has not been opened before. If you ship fragrance oil to your own customers, that ring is proof that the product was not tampered with in transit.
The technical drawing for each size is available as a "Technical Drawing" document on the product page and in the app: 250 ml, 500 ml, 1000 ml.
Filling and Storing: Step by Step
The one weakness of an aluminium bottle is that you cannot see inside it. Because the level is not visible, you fill by scale, not by eye.
- Weigh the bottle and note the tare
Weigh the empty bottle together with its cap and plug. Write this value on the label; later you can find the remaining quantity simply by weighing.
- Fill by weight
Measure fragrance oil in grams, not by volume. 500 grams of an oil with a density of 0.95 g/ml occupies about 526 ml; make sure this does not exceed the bottle's brimful capacity.
- Leave headspace, but not much
Do not fill to the brim: liquid expands in heat and pushes against the plug. On the other hand, a half-empty bottle holds a lot of air and oxidation speeds up. Aim for headspace of roughly 5 to 10 percent of the volume.
- Seat the plug, tighten the cap
Press the inner plug in straight and fully, then turn the cap all the way. Wipe any oil from around the neck; a remaining film resinifies over time and glues the cap shut.
- Label it
Product name, batch number, filling date and tare weight. Metal bottles all look alike; an unlabelled bottle is the most expensive mistake in a workshop.
- Keep it cool and dark
Light is no longer an issue, but heat still is. Keep bottles away from radiators, window sills and car boots.
Know the Limits: Dents, Lining and Compatibility
Aluminium does not break, but it does dent. A dented bottle is usually only a cosmetic problem; a deformation at the neck or thread, however, compromises the seal.
Bottles of this type are generally lined with a protective lacquer on the inside; the oil is in contact with this lining, not with the metal. Confirm the type of lining and which products it is compatible with from your supplier. A deep dent or an internal scratch can damage the lining; do not use such a bottle for long-term storage.
For products that contain water or are acidic or alkaline (cleaning bases, aqueous solutions), aluminium may not be the right choice. No problem is expected with fragrance oils, aroma chemicals and anhydrous solvents; even so, when you fill a new product for the first time, keep it in a small bottle for a few weeks and check colour and odour.
| Symptom | Likely cause | Solution |
|---|---|---|
| Oily film around the cap | Plug not fully seated or neck dented | Replace the plug; if the neck is dented, replace the bottle |
| Cap will not open | Oil left on the neck has resinified | Wrap the cap in a warm cloth and wait; make wiping the neck after filling a habit |
| Colour darkening | Long storage in a half-empty bottle, warm environment | Transfer to a smaller bottle, store somewhere cool |
| Bottle bulging or plug pushed out | Filled to the brim, then exposed to heat | Leave headspace, keep away from heat |
Shipping, Labelling and Frequently Asked Questions
When you ship a bottle of fragrance oil, keep it upright and fix it in the carton so that it cannot move. Check that the tamper-evident ring is intact before dispatch. Many fragrance oils are classified as flammable or hazardous to the environment; transport rules and labelling obligations are determined by the product's safety data sheet (SDS). We cover these topics separately in our transport and labelling articles.
How long can fragrance oil be stored in an aluminium bottle?
Does an aluminium bottle change the smell of the oil?
Glass or aluminium: which is better?
How do I know how much oil is left in the bottle?
What is the tamper-evident cap for?
Can an aluminium bottle be reused?
Can alcohol-based perfume be stored in an aluminium bottle?
Which bottle holds 1 kilogram of fragrance oil?
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