Plastic soap bottle, clear, 28/410, 500 ml

The 500 ml soap bottle is a clear PET bottle with a 28/410 neck, designed primarily for liquid soap and other thicker rinse-off products – shower gels, shampoos, conditioners, and foaming cleansing gels for the bathroom and kitchen. The transparent wall shows the colour and consistency of the contents, making it suitable wherever the product should be visible: on a washbasin, in the shower, or on a retail counter. PET is lightweight and break-resistant, making it a practical choice for wet environments where glass would be a hazard. The packaging material is suitable for use with cosmetic products.

What the bottle is suitable for

• Liquid soap and shower gels – thicker products dispense easily from the bottle with a pump.
• Shampoos and conditioners – the 28/410 neck makes filling with viscous formulations straightforward.
• Household cleaning products – washing-up liquid, cleaning gels, or liquid hand soap for the kitchen, provided the formulation is not aggressive towards plastic.
• Refill packaging – the transparent wall makes it easy to monitor how much product remains, which is practical when topping up smaller dispensers.

Transparency and content protection

A clear bottle does not protect the contents from light. For standard liquid soaps, shower gels, and shampoos with a stable formulation this is not a concern, particularly if they are used regularly and stored in a bathroom away from direct sunlight. However, if the product contains light-sensitive ingredients – a higher proportion of essential oils, natural colorants, certain plant extracts, or active substances – it is advisable to opt for a dark container or to accept the possibility of colour and scent changes during use.

Nominal and total volume

The nominal volume is the volume the bottle is designed for under normal filling conditions. The total brimful volume is the physical capacity up to the neck and is always larger. The difference between them provides headspace for the closure and dispenser – a pump has a dip tube and head that occupy part of the space – as well as room for the contents to expand with temperature changes. The bottle should therefore be filled to the nominal volume, not to the brim. Filling right up to the neck will cause overflow when the pump is fitted and makes it harder to seal the closure properly. The nominal volume is stated in the product specifications.

Choosing a closure

The bottle has a 28/410 neck thread. Closures with the same neck type and ready-made bottle + closure combinations are available in the Handymade range. With a custom combination, we recommend verifying seal integrity and dispensing performance with your specific formulation, particularly for thick products where the dip tube diameter and pump output matter.

What to know when filling

• Preparation before first use – we recommend rinsing the bottle, sanitising it with isopropyl alcohol or ethanol, and allowing it to dry completely. Residual water in the container increases microbiological risk even in preserved products.
• Filling temperature – PET is not intended for hot filling. Allow liquid soap, shampoo, or gel to cool to room temperature before filling; warm contents can deform the bottle wall.
• Essential oils and solvents – at normal fragrance usage levels in rinse-off products, PET is stable. At high concentrations of essential oils, concentrated fragrance compositions, or where the contents include solvents, we recommend verifying compatibility on a test batch – including checking whether the container changes shape or becomes cloudy.
• Content viscosity – thick gels fill more slowly and air bubbles form when poured too quickly. Filling slowly along the bottle wall and allowing a short resting time before fitting the pump will help.
• Labelling – the flat wall provides a surface for a label. With a clear bottle, consider a label that does not cover the entire contents so that the level of product remains visible.
• Reuse – the bottle can be refilled after thorough washing and disinfection. When switching product types (for example, from a scented soap to an unscented gel), be aware that PET may retain some of the previous scent.

The bottle is made from PET, which is a commonly recycled plastic. Once empty and rinsed, it belongs in the plastic waste stream.

Frequently asked questions