Reliable Stopper Retention with Immediate Center Access
When a pharmaceutical vial requires direct access to its rubber stopper, a conventional fully covered closure can add unnecessary handling. At the same time, poor aluminum dimensions, an incorrect vial fit, or inconsistent crimping can result in loose closures, spinning caps, uneven skirts, and production rejects.
Supply-Packagings supplies open-center aluminum crimp seals for pharmaceutical glass vials, penicillin bottles, diagnostic containers, laboratory products, and compatible healthcare packaging.
The closure has a permanently open center that leaves the central stopper area accessible while the aluminum skirt mechanically secures the stopper to the vial.
For fast technical matching, provide your vial neck size, stopper specification, required cap diameter, preferred color, target quantity, and destination market.
Key Product Benefits
◎ Open-center design provides direct access to the rubber stopper after crimping
◎ Aluminum shell provides reliable mechanical retention on compatible vial necks
◎ Multiple colors simplify product, batch, department, and SKU identification
◎ Blue, orange, green, purple, red, silver, and custom finishes available
◎ Common pharmaceutical vial closure sizes can be supplied
◎ Matching butyl rubber stoppers and pharmaceutical glass vials are available
◎ OEM and ODM support for size, color, coating, packing, and project-specific requirements
◎ Factory-direct manufacturer and wholesale supplier for international pharmaceutical custom packaging programs
Product Overview
An open-center aluminum seal is a one-piece pharmaceutical crimp closure with a circular opening in the top.
Unlike a flip-off cap, it does not use a removable plastic button. The rubber stopper’s center area remains exposed after the aluminum closure has been properly crimped onto the vial.
The image shows open-center seals in multiple coated colors, including:
- Bright blue
- Metallic orange
- Green
- Purple
- Red
- Natural silver
Common purchasing terms include:
- Open-center aluminum seal
- Open-hole vial cap
- Center-hole aluminum crimp cap
- Pharmaceutical vial crimp seal
- Injection vial aluminum cap
- Penicillin bottle aluminum seal
- Open-top vial closure
How the Closure System Works
The Vial Is Filled
The pharmaceutical or diagnostic product is filled into a compatible vial according to the customer’s validated manufacturing process.
The Rubber Stopper Is Seated
A matched elastomeric stopper is inserted into the vial neck.
The Aluminum Seal Is Applied
The open-center aluminum shell is placed over the stopper and vial flange.
The Skirt Is Crimped
A compatible crimping head forms the lower aluminum edge beneath the vial flange, mechanically securing the stopper.
The Stopper Center Remains Accessible
The circular top opening provides immediate access to the defined central stopper area without requiring removal of a plastic top.
Open-Center Seals Compared with Flip-Off Caps
Open-Center Aluminum Seals
Best when direct stopper access is desired immediately after capping.
Benefits include:
- Fewer closure components
- Simple construction
- Lower component complexity
- Permanent visibility of the stopper access area
Flip-Off Caps
Include a plastic button or cover over the center.
They may be preferred when buyers want:
- Physical coverage before first access
- Clear visual evidence that the top has been removed
- Additional color coding through molded plastic
The correct design depends on product workflow, user requirements, and packaging qualification.
Common Procurement Problems and Solutions
The Seal Spins After Crimping
Potential factors include cap dimensions, vial flange geometry, stopper compression, aluminum properties, or incorrect crimp settings.
Supply-Packagings recommends evaluating the vial, stopper, closure, and capping process as a single packaging system.
Crimp Edges Are Uneven
Variations in aluminum shell dimensions or equipment adjustment can produce wrinkling and irregular finished profiles. Stable closure dimensions help make the process easier to optimize.
Stopper Compression Is Incorrect
The stopper flange forms part of the final closure stack height. An incompatible stopper can affect both sealing and cap appearance.
Colored Coating Scratches in Transit
Decorative aluminum surfaces require controlled packing to minimize cap-to-cap abrasion.
Colors Change Between Repeat Orders
An approved physical color reference can be used for recurring wholesale production to maintain visual consistency.
Structure and Functional Features
Circular Center Opening
The open center allows access to the central rubber stopper area without removing the aluminum seal.
Deep Aluminum Skirt
The skirt is designed to be formed around a compatible vial neck flange using pharmaceutical crimping equipment.
Rolled or Finished Edges
Controlled edge geometry helps improve handling and reduce unwanted sharpness in properly manufactured closures.
Colored Surface Finish
Decorative coatings provide visual identification without changing the underlying vial format.
This makes color coding useful for:
- Different formulations
- Different concentrations
- Different departments
- Product families
- Private-label packaging
Technical Specifications
| Parameter | Available Options |
|---|---|
| Product Type | Open-center aluminum crimp seal |
| Material | Aluminum |
| Top Design | Circular open center |
| Standard Appearance | Natural silver |
| Colors | Blue, orange, green, purple, red, silver, custom |
| Finish | Metallic, matte, gloss according to project |
| Common Sizes | 13mm / 20mm / 28mm and additional compatible sizes |
| Compatible Container | Crimp-neck pharmaceutical glass vial |
| Compatible Stopper | Pharmaceutical butyl rubber stopper |
| Application Method | Vial crimping equipment |
| OEM Options | Color, finish, packing, standard dimensions |
| ODM Options | Custom structures subject to technical feasibility |
| MOQ | Depends on size, color, finish, and packing |
| Samples | Available for selected existing specifications |
| Packing | Sealed inner bags and reinforced cartons |
| Shipping | Sea, air, express |
| Trade Terms | FOB, CIF, DDP according to destination |
Final dimensions, aluminum temper, coating, cleanliness requirements, processing compatibility, and documentation should be agreed for each pharmaceutical project.
Matched Pharmaceutical Packaging Components
Clear Glass Vials
Suitable when product visibility and visual inspection are important.
Amber Glass Vials
Available for formulations requiring additional light shielding as part of their stability strategy.
Butyl Rubber Stoppers
Bromobutyl and chlorobutyl rubber stoppers can be coordinated with the vial and aluminum seal.
Lyophilization Stoppers
Freeze-drying stopper designs can also be supplied for compatible pharmaceutical processes.
Secondary Packaging
Paper cartons, PET trays, dividers, and labels can be customized for individual or multi-vial programs.
Industries Served
💉 Pharmaceutical Containers — compatible injection, liquid, powder, and penicillin vial systems
🧫 Diagnostics — reagents, calibrators, controls, and laboratory products
🔬 Biotechnology — research products and compatible biological preparations
🐾 Veterinary Pharmaceuticals — selected vial-based veterinary products
🏥 Clinical Packaging — hospital, laboratory, and professional-use vial kits
📦 Contract Manufacturing — filling, stoppering, crimping, and secondary packaging facilities
Application Scenarios
🔹 Pharmaceutical vial crimping lines
🔹 Penicillin bottle packaging
🔹 Diagnostic reagent vial systems
🔹 Laboratory products requiring direct stopper access
🔹 Multi-SKU programs using aluminum colors for identification
🔹 Freeze-dried product packaging using compatible stoppers
🔹 Wholesale export programs requiring vial, stopper, cap, and carton procurement
Product Advantages
Simple Direct-Access Closure
The open-center structure eliminates the need to remove a plastic button before accessing the central stopper region.
Cost-Efficient Component Design
A one-piece aluminum closure reduces structural complexity compared with multi-component aluminum-plastic systems.
Flexible Color Coding
A single vial and stopper format can be paired with several cap colors, helping simplify component standardization while keeping products visually distinct.
OEM and ODM Development
OEM programs can customize existing open-center seals with color and packing specifications. ODM projects can evaluate special diameters, heights, or opening geometries for qualifying volumes.
One Supplier for Complete Packaging
Supply-Packagings can coordinate pharmaceutical closures with bottle and vial systems, jar, pouch, supplement packaging, liners, trays, and cartons, reducing the number of custom packaging suppliers buyers need to manage.
Quality Control
Typical inspection points can include:
◇ Cap outside diameter
◇ Aluminum skirt depth
◇ Center-hole diameter
◇ Edge and surface condition
◇ Color and coating uniformity
◇ Fit testing with approved vial and stopper samples
◇ Crimp appearance evaluation during qualification
◇ Carton quantity and lot identification
◇ Packing inspection before shipment
For pharmaceutical use, final container-closure performance should be validated by the product manufacturer based on the formulation, stopper, vial, crimp process, sterilization requirements, storage conditions, and applicable regulations.
Packaging and Logistics
Protective Bulk Packing
Aluminum seals can be supplied in sealed clean inner bags and reinforced master cartons. Packing density is controlled to reduce shell deformation and excessive abrasion of colored surfaces.
Palletized shipping is available for high-volume factory orders.
International Shipping
Sea freight is generally the most cost-effective method for wholesale quantities. Air freight supports urgent manufacturing schedules, while express services are recommended for samples and qualification trials. DDP solutions can be evaluated for selected markets.
Frequently Asked Questions
Q1. What is an open-center aluminum vial seal?
It is an aluminum crimp closure with a permanent circular opening that leaves the central rubber stopper area accessible after application.
Q2. What is the difference between this cap and a flip-off cap?
A flip-off cap covers the center with a removable plastic component. An open-center seal leaves the stopper access area exposed from the beginning.
Q3. What sizes are available?
Common pharmaceutical sizes include 13mm and 20mm, with 28mm and other specifications available for compatible vial systems.
Q4. Can you produce the colors shown in the image?
Yes. Blue, orange, green, purple, red, silver, and other custom finishes can be evaluated.
Q5. Can you supply matching rubber stoppers?
Yes. Bromobutyl, chlorobutyl, and selected lyophilization stopper options are available.
Q6. Can you supply the pharmaceutical glass vials?
Yes. Clear and amber glass vial packaging can be coordinated with the stopper and cap specification.
Q7. Does an open-center cap provide tamper evidence?
It provides mechanical retention of the stopper but does not offer the same removable-button first-opening indication as a typical flip-off closure. Tamper-evidence requirements should be evaluated for the specific product and market.
Q8. Can you provide samples for crimping tests?
Yes. Samples of suitable existing specifications can be supplied for fit, crimp appearance, and production-line qualification.
Buyer Feedback
★★★★★ Direct access simplified our workflow
“We did not need a plastic flip button for our application, so the open-center seal gave us a simpler closure system.”
— Packaging Engineer, Diagnostic Manufacturer
★★★★★ Color coding helped production identification
“We use the same vial size with several seal colors. Operators can distinguish products immediately without changing the bottle format.”
— Operations Manager, Healthcare Supplier
★★★★★ Matched components reduced crimping adjustments
“Using the vial, stopper, and aluminum seal as a matched set improved our qualification process and reduced trial-and-error.”
— Procurement Lead, Contract Packaging Company
Related Product Categories
- Open-Center Aluminum Crimp Seals
- Aluminum Tear-Off Seals
- Standard Flip-Off Caps
- Hinged Pharmaceutical Vial Caps
- Butyl Rubber Stoppers
- Lyophilization Stoppers
- Pharmaceutical Glass Vials
- Penicillin Bottles
- Pharmaceutical Containers
- Supplement Packaging
- Bottle Packaging
- Jar Packaging
- Flexible Packaging
- Pouch Packaging
- Pharmaceutical Folding Cartons
- Custom Packaging Services
Visit our products page for complete packaging development support.
Request a Matching Aluminum Seal for Your Vial
Send the vial neck diameter, existing vial drawing or physical sample, rubber stopper specification, preferred center opening, color, estimated quantity, and destination market. If you currently use another aluminum closure, sending both the existing cap and vial provides the fastest starting point for dimensional matching.
Supply-Packagings provides OEM, ODM, factory-direct manufacturing and wholesale custom packaging support for aluminum vial seals, pharmaceutical glass bottles, rubber stoppers, jar packaging, pouch packaging, supplement containers, and secondary cartons.
For dimensional matching, qualification samples, MOQ, production lead time, and global shipping options, Contact Us.
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