Tamper-Evident Black Bottle Cap 18mm – Ribbed Polycone-Lined Closure

What Is a Tamper-Evident Bottle Cap?

A tamper-evident cap includes a breakaway security band beneath the main closure.

When correctly fitted to a compatible bottle, the band engages beneath the bottle-neck retaining ring. On first opening, the bridges connecting the band to the cap break, leaving visible evidence that the bottle has been opened.

This makes the closure useful where a clear first-opening indication is preferred.

The tamper-evident feature will only work when:

• the bottle has a compatible neck profile
• the thread matches correctly
• the cap is fully applied
• the retaining band engages beneath the bottle ring
• the cap and bottle are undamaged

It should not be assumed to function correctly on every GL18 bottle.

Polycone-Lined Seal

Inside the cap is a tapered polycone liner.

As the cap is screwed onto a compatible glass bottle, the liner compresses around the rim and inner edge of the bottle opening.

This helps create a close seal and may reduce the risk of leakage or evaporation during upright storage.

Sealing performance depends on:

• bottle-neck dimensions
• thread compatibility
• cap application
• liquid type
• filling level
• storage position
• temperature
• liner condition

Always perform compatibility and leakage testing before transport or prolonged storage.

Compatible 18mm Bottles

This closure is intended for compatible glass bottles with an 18mm 410/415 thread and a suitable tamper-evident retaining ring.

It may be suitable for selected:

• amber glass bottles
• blue glass bottles
• essential-oil bottles
• tincture bottles
• aromatic stock bottles
• ritual-water bottles
• fragrance and room-spray bottles

A bottle may have an 18mm thread but still lack the correct neck bead for the tamper-evident band.

Check both the thread and neck profile before use.

Secure Storage and Packaging

This cap is designed for storage and packaging rather than dispensing.

It may be used when a bottle needs to be:

• securely closed
• stored upright
• transported
• prepared for retail presentation
• protected with a visible first-opening indicator
• used as a stock or refill bottle
• sealed before fitting a different closure later

For spraying, replace it with a compatible GL18 atomiser.

For controlled drop dispensing, use a suitable 18mm dropper closure.

Ribbed Grip

The ribbed outer surface provides a firmer grip when fitting or removing the cap.

This is useful when:

• hands are slightly oily
• bottles are opened frequently
• a secure hold is needed
• a professional packaging finish is preferred

The black polypropylene construction gives the cap a simple, durable appearance suitable for personal, professional and retail use.

Suitable Uses

This tamper-evident GL18 cap may be used with compatible bottles containing suitable external-use preparations such as:

• essential oils
• diluted oil blends
• tinctures
• fragrance concentrates
• aromatherapy blends
• ritual waters
• room-spray bases
• sacred sprays
• botanical preparations
• aromatic stock solutions

Always confirm compatibility between the liquid, bottle, cap and liner.

For Essential Oils and Aromatherapy Blends

Polycone-lined closures are often selected for oil-based preparations because the tapered liner helps form a close seal around the bottle opening.

The cap may be suitable for:

• essential-oil storage
• carrier-oil blends
• massage-oil preparations
• aromatic concentrates
• professional treatment blends
• refill and stock bottles

Not every oil, solvent or formulation is compatible with every plastic or liner material.

Test before prolonged storage.

For Tinctures and Botanical Preparations

The cap may also be used on compatible glass bottles holding tinctures, extracts or other botanical preparations.

Before filling, ensure that the bottle and closure are:

• clean
• dry
• undamaged
• chemically compatible
• correctly labelled

The bottle should be stored upright and checked regularly for leakage.

This cap is sold as an empty closure only. The user is responsible for confirming suitability for the intended contents.

For Ritual Waters and Sacred Sprays

This cap may be used to seal compatible bottles holding:

• Florida Water
• Kananga Water
• Agua de Rosas
• Palo Santo Cologne
• room mists
• smokeless cleansing sprays
• meditation blends
• aura sprays

It may be useful for storage, transport or retail presentation before a compatible atomiser top is fitted.

Alcohol-based ritual colognes are flammable and must be kept away from heat, sparks, candles, incense and open flame.

How to Fit the Cap

Check the Bottle

Confirm that the bottle has a compatible 18mm 410/415 thread and a suitable tamper-evident retaining ring.

Inspect the Closure

Check that the cap, liner, security band and connecting bridges are intact.

Fill the Bottle

Do not overfill. Leave sufficient headspace below the neck.

Position the Cap

Place the cap squarely over the bottle thread.

Tighten

Screw the cap on firmly and evenly until the tamper-evident band engages beneath the bottle-neck ring.

Do not overtighten.

Test

Check that:

• the cap sits straight
• the band is correctly positioned
• the bottle is securely sealed
• there is no leakage
• the cap cannot be removed without breaking the security band

What Happens When the Bottle Is Opened?

On first opening, the tamper-evident band should separate from the main cap along the small connecting bridges.

The band usually remains around the bottle neck while the cap is removed.

This provides a visible indication that the closure has been opened.

Once broken, the tamper-evident feature cannot be restored.

The cap itself may still be used as a standard screw closure if undamaged, but it will no longer provide first-opening evidence.

Care and Reuse

The cap may remain usable as a standard closure after the tamper band has broken, provided the cap and liner remain clean and undamaged.

However:

• the tamper-evident function is single use
• the band cannot be reattached
• the closure should not be represented as tamper-evident after first opening
• the liner should be checked for distortion or contamination
• the cap should be replaced if the thread or seal becomes worn
• cross-contamination between different preparations should be avoided

Store filled bottles upright.

Quick FAQs

What bottle does this cap fit?
It is designed for compatible glass bottles with an 18mm 410/415 thread and a suitable tamper-evident neck profile.

Does it fit every GL18 bottle?
Not necessarily. The thread may fit while the tamper band does not engage. Test the complete bottle-and-cap combination before use.

What is the cap made from?
Black polypropylene with a polycone liner.

What does the polycone liner do?
It compresses around the bottle opening to help create a secure seal.

How does the tamper-evident band work?
The band catches beneath the bottle-neck ring and breaks away from the cap when first opened.

Can the tamper band be reused?
No. The tamper-evident function is single use.

Is the cap ribbed?
Yes. The ribbed finish provides additional grip.

Is the bottle included?
No. This listing is for the closure only.

Can it be used for essential oils?
Yes, where the liquid, bottle, cap and liner are compatible.

Is it leakproof?
It is designed to create a secure seal, but performance depends on compatibility, fitting, contents and storage. Always test before transport.

Care and Safety

• Sold as an empty bottle closure.
• Bottle and contents are not included.
• Check thread, neck profile, liner and liquid compatibility before use.
• The tamper-evident function requires a compatible bottle-neck retaining ring.
• Do not use damaged or distorted caps.
• Do not overtighten.
• Store filled bottles upright.
• Test for leakage before transport or retail use.
• Label all filled bottles clearly.
• Keep filled bottles out of reach of children and pets.
• Not intended for food, drink or internal preparations unless suitability has been independently confirmed.
• Alcohol-based contents are flammable.
• Keep flammable liquids away from heat, sparks and open flame.
• Replace the closure if the cap, liner, thread or security band is damaged.

Disclaimer

This tamper-evident GL18 polycone-lined cap is sold as an empty closure for compatible bottles and external-use liquids.

The user is responsible for checking bottle-thread compatibility, tamper-band engagement, liner suitability, chemical compatibility, sealing performance and storage conditions before use.

Sacred Essence cannot accept responsibility for leakage, failed tamper indication, contamination, product loss, fire risk or other harm caused by unsuitable bottles, incompatible contents, incorrect fitting, damaged components, misuse or inadequate testing.