Plastic cap, 38 mm, clear

The 38 mm plastic cap is a screw closure made of polypropylene (PP) designed for containers with a BER38 neck finish. It seals the container without a dispenser, making it suitable for applications where the contents are poured, measured, or decanted into smaller packaging.

The transparent version is visually neutral. It pairs with both clear and coloured bottles without interfering with the label or the colour of the contents.

Suitable applications

The wide 38 mm neck makes filling and pouring thicker products easier — products that would flow slowly through a narrow opening. A simple screw cap is particularly practical in the following applications:

• Refills and bulk packaging – liquid soaps, shampoos, conditioners, or shower gels from which contents are decanted into smaller pump-fitted bottles.
• Raw materials and intermediates – hydrolats, surfactants, vegetable oils, or ready-made bases that are measured and weighed out during production.
• Household cleaning products – laundry gels, dishwashing liquids, and cleaning agents dispensed by pouring.
• Transport and storage – a plain cap has no moving parts that could be accidentally pressed or opened during transit.

Bottles with the same neck finish (specified in the parameters) and ready-matched container and closure combinations are available from Handymade. With a custom combination, it is advisable to test the seal with the actual contents beforehand.

Material and compatibility with contents

Polypropylene is a lightweight, flexible plastic that tolerates water-based, oil-based, and alcohol-based cosmetic contents, including standard surfactant blends. The cap is suitable for contact with cosmetic products.

What to keep in mind when filling and sealing

• Preparation before first use – wash the cap, disinfect with isopropyl alcohol or ethanol, and allow it to dry completely to prevent water from entering the product.
• Fill to the nominal volume – the nominal volume is the volume the bottle is designed for under normal filling conditions; the total capacity to the brim is the physical volume right up to the neck. The difference serves as a reserve for the closure and for expansion of the contents with temperature changes. An overfilled bottle will push the contents into the thread when capped, and the cap will not seat cleanly.
• Clean neck – residue on the thread reduces the seal and dries out over time; wipe the neck before screwing on the cap.
• Hot contents – products filled while hot should be allowed to cool before capping; otherwise, water vapour condenses under the cap.
• Recycling – polypropylene is a recyclable plastic and is sorted together with other plastic packaging.

Frequently asked questions