Blue Glass Bottle, Black Aluminium Cap, 50 ml

A blue glass medicine bottle with a capacity of 50 ml and a black aluminium cap is used for filling and storing liquid cosmetic preparations. Blue glass filters out part of the light, which in a clear bottle speeds up the oxidation of oils and changes in fragrance. The glass does not react with common cosmetic ingredients, does not absorb oil or fragrance compounds, and withstands formulations with a higher proportion of alcohol or essential oils.

The set is declared suitable for contact with cosmetics. The cap closes the bottle without a dispensing element; the contents are poured out or measured out. It is therefore suitable for face and body oils, serums, toners, tinctures and concentrated fragrance blends that are poured or decanted when used. It also works for samples and test batches, where 50 ml is enough to check a formulation.

What it is suitable for

• Face and body oils – vegetable oils sensitive to oxidation, whose fragrance and colour are better preserved in darker glass.
• Serums and toners – both water-based and alcohol-based formulations; the glass does not change its properties on contact with solvents or at a lower pH.
• Tinctures and alcohol extracts – homemade herbal tinctures intended for cosmetics.
• Essential oil blends and perfume compositions – concentrated fragrance components belong in glass, which does not absorb them and can be reused after washing.
• Samples and test batches – you can try out a formulation in the actual packaging before larger-scale production.

Filling and volume

The nominal volume is the quantity the packaging is designed for under normal filling. The total brimful volume, which you will find in the parameters, expresses the physical space of the bottle up to the neck. The difference between them is a reserve for the cap with its sealing liner and room for the contents to expand when the temperature changes. Fill up to the nominal volume, never to the brim, otherwise part of the contents is pushed onto the cap liner when closing.

Cap and seal

The aluminium cap with an 18 mm thread has a foam polyethylene liner inside that sits on the bottle neck and seals it. Tighten it by hand. Excessive force compresses the liner and the seal deteriorates with repeated opening. Thin aluminium deforms easily, so do not open the cap with pliers or any other tool.

Closures with the same neck type and ready-made bottle-plus-closure combinations are available in the Handymade range. If you make your own combination, for example with a dropper for dispensing drop by drop, we recommend checking the tightness and behaviour of the closure with your specific formulation.

Good to know

Blue glass dims light but does not block it completely. Store the finished product away from direct sunlight, especially for oils with a high proportion of unsaturated fatty acids and for citrus essential oils.

After washing and disinfection, the bottle can be reused. When changing the contents from a fragrance composition to an unscented preparation, replace the cap, as the foam liner retains fragrance. For recycling, it is enough to unscrew the cap; the glass belongs in glass collection and the aluminium cap with metals.

The set is intended for cosmetic products; it is not approved for food.

Frequently asked questions