Plastic lid for jar 70/400, black

Plastic screw cap for jars and pots with a 70 mm thread seals cream, butter, scrub or balm to keep the contents protected from dust, drying out and accidental opening. The black colour is a practical choice: it blocks light coming from above, hides the contents from view and pairs well with both dark and light jars, making it suitable for a unified product line.

The cap is suitable for cosmetic products and for direct contact with food. It can therefore be used not only for body butters and creams, but also for home-made oils, honey, spices or dried herbs filled into jars with the same neck.

Key benefits

• Reliable sealing – the screw thread holds the cap firmly on the neck and limits air access, which slows down the drying of creams and soft textures.
• Light protection from above – opaque black plastic does not let light through the cap, which is appreciated for products with vegetable oils and sensitive active ingredients.
• Low weight and durability – plastic does not break, withstands normal handling during filling and transport and does not add to the weight of shipments.
• Food-grade and cosmetic quality – one cap serves both in a cosmetics workshop and in the home kitchen.
• Easy opening – the wide diameter gives fingers a good grip, so it can be opened even with wet or greasy hands.

Use

The cap is placed on a jar or pot with the same thread type (stated in the parameters) and tightened by hand. It does not need to be tightened with force. A firm but moderate turn is sufficient to seal it, and the customer will be able to unscrew it comfortably later.

When filling, it is advisable to leave a small reserve below the neck: the jar is filled to the nominal volume, not to the rim. The nominal volume is the volume the container is designed for in normal filling. The total volume to the brim is the physical volume of the container up to the neck. The difference between them creates space for the cap and for the expansion of the contents when the temperature changes. If the jar is overfilled, the contents are pushed into the thread when screwing and the cap then seals less effectively.

Jars and pots with the same neck type and ready-made container + closure sets are available in the Handymade range. When combining your own components, we recommend verifying the seal integrity and closure behaviour with the specific formulation, especially for thinner textures and products with a high oil content.

Suitable for products such as

• Body butters and balms – a thick texture that is scooped with fingers requires a wide neck and a cap that is easy to open.
• Creams and masks – facial and body creams in larger jars, where the priority is protection from drying out.
• Sugar and salt scrubs – grainy products; wipe off any grain caught in the thread before sealing to ensure a good seal.
• Solid shampoos, bath salts and decorative cosmetics – dry products that only need protection from dust and moisture.
• Food – honey, syrups, dried herbs, spices or home-made oils in jars with the same neck.

Good to know

Before first use, it is advisable to wash the cap, rinse it with clean water and allow it to dry completely. For cosmetics, it is also recommended to disinfect the inside with isopropyl alcohol or ethanol and allow it to evaporate. Moisture trapped in the cap is an unnecessary source of microbial contamination.

Plastic is sensitive to essential oils and solvents at higher concentrations. With standard creams and butters at normal fragrance dosage, no problem arises. With concentrated fragrance blends or products with a higher alcohol content, we recommend checking whether the inside of the cap changes in appearance or smell before a larger batch.

The cap is designed for reuse: once the jar is empty, it can be washed and used again, as long as the thread is not damaged.

At the end of its useful life, the cap belongs in sorted plastic waste. Simply empty it and remove any remaining contents.

Frequently asked questions