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GL18 White Tamper-Evident Closure with Integrated Vertical Dropper

Name: GL18 White Tamper-Evident Closure with Integrated Vertical Dropper - BlueSky Solutions
SKU: GL18TEW-IVD

GL18 white tamper-evident closure with integrated vertical dropper, PEHD/PELD. Fits all GL18 bottles 5ml–100ml. Precision dosing ±10%. Ideal for retail pharmaceutical drops and supplements.

MOQ and lead time applies – Please contact us for further details

The GL18 White Tamper-Evident Closure with Integrated Vertical Dropper (GL18TEW-IVD) combines first-open tamper evidence with a precision vertical dropper insert in a single GL18 assembly, manufactured in PEHD and PELD. The integral tamper-evident ring — moulded as part of the PEHD cap body — provides visible first-open evidence confirming the product has not been accessed prior to purchase, while the PELD vertical dropper insert delivers precision dosing of ±10% from the nominal target dose weight when the bottle is fully inverted to 180°. Drop rate is targeted at 60–120 drops per minute in line with European Pharmacopoeia monograph 0672. This combination makes the GL18TEW-IVD the appropriate closure for retail pharmaceutical oral drops, vitamin and mineral liquid supplements, oral tinctures, and regulated wellness formulations where both accurate dose delivery and consumer-facing tamper evidence are required simultaneously.

This closure occupies a well-defined position in the GL18 system: it provides more consumer assurance than the standard vertical dropper (GL18W-IVD, which has no tamper evidence) while stopping short of the access-restriction function of the CRC vertical dropper (GL18CRCW-IVD). It is the appropriate specification for retail OTC liquid products and nutraceuticals sold through pharmacy, health retail, and e-commerce channels where tamper evidence is a standard consumer expectation, but where child-resistant packaging is not a regulatory requirement for the product category. As part of the GL18 system (also known as NW18 or DIN168), the GL18TEW-IVD is fully interchangeable across all GL18 glass dropper bottles in the BlueSky range — 5ml to 100ml, in both amber and clear glass. For the correct dropper geometry to be specified, BlueSky requires the liquid’s viscosity, surface tension, density, and target dose weight. Contact BlueSky to confirm stock availability, MOQ, and TE ring type before specifying.

Additional information

Material	PEHD/PELD
Neck size	GL18

Integral Tamper-Evident Ring — Retail Consumer Assurance

The tamper-evident ring is moulded as an integral part of the PEHD cap body, with TE bridges providing visible evidence of first opening. When the cap is opened for the first time, the bridges break and the ring remains on the bottle neck — giving consumers immediate confirmation that the product has not been accessed prior to purchase. For retail pharmaceutical drops, vitamin formulations, and wellness supplements sold through pharmacy and health retail channels, tamper evidence is a standard consumer expectation and a commercial requirement for credible retail presentation. Please contact BlueSky’s team to confirm the specific TE ring type for this closure before specifying.

Integrated Vertical Dropper — ±10% Precision Dosing

The PELD vertical dropper insert delivers drop weight reproducibility of ±10% from the nominal target dose — the standard precision requirement for pharmaceutical oral drops and regulated liquid supplements. The bottle is fully inverted to 180°, with drops falling by gravity through a controlled drip tube geometry. Four variables govern dispensing performance: drip tube diameter (drop volume), drip hole dimensions (flow speed), air hole geometry (speed and internal pressure), and air tube length (pressure equalisation and flow speed). To specify the correct dropper geometry, BlueSky requires the liquid’s viscosity, surface tension, density, and target dose weight.

European Pharmacopoeia Drop Rate Target

The vertical dropper is designed to a target drop rate of 60–120 drops per minute in line with European Pharmacopoeia monograph 0672 — the reference standard for oral drop dispensing in pharmaceutical applications. This makes the GL18TEW-IVD appropriate for OTC pharmaceutical preparations, licensed oral drop products, and nutraceutical formulations where alignment with pharmacopoeial dosing standards is commercially or regulatorily expected. Where a specific drop rate is required, please state this when contacting BlueSky’s team for dropper geometry specification.

PEHD/PELD Two-Material Construction

The cap body is manufactured in PEHD (high-density polyethylene), providing structural rigidity, chemical resistance, and the integral TE ring mechanism. The vertical dropper insert is manufactured in PELD (low-density polyethylene), which provides the flexibility required for the dropper geometry to function correctly. Both materials offer broad compatibility with aqueous oral liquid formulations, vitamin preparations, alcohol-based tinctures, and herbal extracts. Formulation compatibility testing is always recommended prior to committing to production.

Tamper Evidence Without Child Resistance — Retail Pharmaceutical Positioning

The GL18TEW-IVD provides first-open tamper evidence combined with precision dosing — without a child-resistant opening mechanism. This positions it correctly for retail OTC pharmaceutical drops, nutraceuticals, and regulated wellness supplements sold through pharmacy and health retail channels where tamper evidence is expected but child resistance is not a mandatory packaging requirement. For products where child resistance is required in addition to precision dosing, the GL18CRCW-IVD is the appropriate specification.

Universal GL18 Compatibility — 5ml to 100ml

The GL18TEW-IVD is compatible with all GL18 glass dropper bottles in the BlueSky range — 5ml, 10ml, 15ml, 20ml, 30ml, 50ml, and 100ml — in both amber and clear glass. The GL18 neck standard maintains a consistent inner bore diameter of 10.65mm ± 0.15mm across all bottle volumes, meaning this closure specification does not change when bottle size changes within the range. For light-sensitive pharmaceutical and nutraceutical formulations, amber glass is typically the recommended specification.

Pharma and healthcare oral drops
Liquid oral supplements
Oral tinctures and herbal extracts
Homeopathic oral preparations
Nutraceutical regulated formulations
OTC wellness and health supplements
Veterinary oral liquids

Delivery & Returns

Orders for products in our ‘In Stock’ ranges will normally be delivered within two working days. Our product ranges labelled as ‘Product MOQ Applicable’ may be subject to a lead time which will be confirmed to you when we receive your order. For information relating to delivery charges, please refer to the ‘Is there a carriage charge?’ section in our FAQs page.

In some instances, goods can be returned. Please view our full refunds policy in our terms and conditions here: Terms & Conditions.

Core Product Range

We endeavour to hold continuous stock of this product. We expect to stock these ranges for a significant period of time in the future. This ensures you can build ranges around them and rely on their availability both now and in the coming years.

In Stock

We hold these products in our UK warehouses for you and they are available for rapid delivery.

Product MOQ Applicable

These products are not currently available from our UK held stock. However, we can supply you from our flexible and solid, global supply chain. Please note that there are minimum order quantities (MOQs) associated with this product, and lead times may vary depending on the quantity ordered. For more information on MOQs and lead times, please contact: sales@blueskysolutionsuk.com

Additionally, we can create bespoke products for you whether through colour, decoration, or bespoke tooling - to your specification. Our team of product experts will work with you to understand your requirements and place the necessary orders.

Frequently Asked
Questions

What formulation data is needed to specify the correct dropper geometry?

To select the correct vertical dropper geometry, BlueSky requires: the liquid’s viscosity, surface tension, and density; your target dose or drop weight; and a safety data sheet for compatibility assessment. Where no specific drop speed is requested, the standard target of 60–120 drops per minute is applied in line with European Pharmacopoeia monograph 0672. Please provide this information when enquiring so BlueSky’s team can confirm the appropriate dropper specification before ordering.

What is the difference between this closure and the standard GL18 vertical dropper?

Both closures incorporate a precision vertical dropper delivering ±10% dosing accuracy, but the GL18TEW-IVD adds an integral tamper-evident ring providing visible first-open evidence. The GL18W-IVD is appropriate for professional, trade, or non-retail applications where tamper evidence is not a consumer-facing requirement. The GL18TEW-IVD is the correct specification for retail products where consumers expect visible confirmation that the product is sealed and untampered at point of purchase.

When should I choose this closure over the CRC vertical dropper?

The GL18TEW-IVD is appropriate where tamper evidence and precision dosing are required but child-resistant packaging is not mandated for the product category. The GL18CRCW-IVD adds a child-resistant opening mechanism for products where child access to the liquid contents presents a safety risk — such as concentrated pharmaceutical preparations or products subject to child-safety packaging legislation. If you are unsure which specification is required for your product, your regulatory advisor can confirm the applicable packaging requirements for your category and market.

Does this closure meet requirements for retail pharmaceutical packaging?

The GL18TEW-IVD combines tamper evidence with precision vertical dropper dosing aligned to European Pharmacopoeia monograph 0672, making it technically appropriate for many retail pharmaceutical oral drop applications. For licensed pharmaceutical products, the specific packaging requirements — including tamper evidence type, closure material compatibility, and child-resistance obligations — must be confirmed with your regulatory advisor and with BlueSky’s team before specifying. Please contact BlueSky to discuss your application in full.

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GL18 White Tamper-Evident Closure with Integrated Vertical Dropper

Additional information

Integral Tamper-Evident Ring — Retail Consumer Assurance

Integrated Vertical Dropper — ±10% Precision Dosing

European Pharmacopoeia Drop Rate Target

PEHD/PELD Two-Material Construction

Tamper Evidence Without Child Resistance — Retail Pharmaceutical Positioning

Universal GL18 Compatibility — 5ml to 100ml

Delivery & Returns

Frequently Asked
Questions

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GL18 White Tamper-Evident Closure with Integrated Vertical Dropper

Additional information

Integral Tamper-Evident Ring — Retail Consumer Assurance

Integrated Vertical Dropper — ±10% Precision Dosing

European Pharmacopoeia Drop Rate Target

PEHD/PELD Two-Material Construction

Tamper Evidence Without Child Resistance — Retail Pharmaceutical Positioning

Universal GL18 Compatibility — 5ml to 100ml

Delivery & Returns

Frequently Asked Questions

Ready to discuss this product?

What our customers say

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Frequently Asked
Questions

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