The Technical Vault
By SOSCleanroom
WHEATON 224193-01
20 mm Crimp Seal
Natural Aluminum
Complete Tear-Off
Unlined
100 / Inner Pack
1,000 / Case
WHEATON 224193-01: selecting a 20 mm complete tear-off crimp seal
WHEATON® 224193-01 is a natural aluminum, unlined, complete tear-off seal manufactured by DWK Life Sciences. The product is designed for laboratory bottles and vials requiring a compatible 20 mm crimp closure that can later be completely removed to provide access to the container contents.
The manufacturer's specifications identify the seal as 20 mm, natural color, complete tear-off, 100 seals per inner pack, and 1,000 seals per case. The aluminum seal is a mechanical retaining component and is not a preassembled rubber stopper or septum system.
When correctly crimped over a compatible stopper and bottle or vial finish, the aluminum closure retains the stopper in position. Closure-system performance depends on the complete assembly, including the glass or plastic container, stopper design, crimp quality, and operating conditions.
Operations takeaway: The purpose of a complete tear-off seal is to allow removal of the entire aluminum closure. Select this configuration when the approved process requires full removal rather than permanent syringe access through an open-top seal.
Specifications (SKU controls for RFQs, SOPs, and receiving)
- Manufacturer: DWK Life Sciences
- Brand: WHEATON®
- Catalog Number: 224193-01
- Product Family: WHEATON Unlined Aluminum Seals
- Material: Aluminum
- Color: Natural
- Visual Finish: Silver-colored aluminum
- Nominal Size: 20 mm
- Closure Format: Crimp-on seal
- Seal Type: Complete Tear-Off
- Liner: Unlined
- Included Stopper: Not included as part of the reviewed seal-only configuration
- Included Septum: Not included as part of the reviewed seal-only configuration
- Intended Container Finish: Compatible 20 mm crimp finish
- Inner Pack Quantity: 100
- Case Quantity: 1,000
- Purchase Unit: Case
- Application: Mechanical retention and complete removal of compatible vial or bottle closure assemblies
Documentation rule: Identify the exact catalog number 224193-01. The manufacturer offers several 20 mm aluminum seals that differ in color and tear-off or access style. These configurations are not interchangeable solely because they share a nominal diameter.
How an aluminum crimp seal works with the container and stopper
A typical laboratory crimp closure system consists of a container with a crimp-compatible neck finish, a separately selected stopper, and an aluminum seal that is mechanically formed around the neck.
The stopper supplies the principal sealing surface. The aluminum seal holds that stopper in position by capturing the container finish after crimping. Correct compression and retention are influenced by the stopper's geometry and material as well as the cap, container finish, and tool setup.
- Container: Provides the compatible 20 mm crimp finish and sealing surface.
- Stopper: Provides the primary material interface between the contents and closure system.
- Aluminum Seal: Retains the stopper by mechanically engaging the container finish.
- Crimping Tool: Forms the aluminum skirt around the appropriate neck geometry.
- Tear-Off Feature: Allows removal of the aluminum closure when full container access is required.
System-level sealing: Do not evaluate leak resistance, storage stability, sterile-barrier performance, or closure integrity based only on the aluminum component. Those characteristics must be established for the complete selected assembly.
20 mm closure geometry: distinguish the crimp finish from the mouth opening
A 20 mm crimp seal is selected using the container's nominal crimp-finish dimensions. DWK explains that seals and stoppers for crimp containers are selected according to the outside diameter of the vial or bottle mouth.
The nominal mouth outside diameter and the internal opening are not interchangeable measurements. For example, a compatible bottle may have a 20 mm outside crimp finish while the inside mouth diameter is smaller.
| Specification |
Meaning for selection |
| 20 mm seal size |
Nominal aluminum closure size for a compatible crimp-finish container |
| Mouth outside diameter |
Critical dimension used to select the corresponding nominal crimp seal and stopper size |
| Mouth inside diameter |
Internal opening; not the nominal aluminum crimp seal size |
| Neck and flange geometry |
Affects seating, crimp retention, and mechanical compatibility |
| Stopper geometry |
Must match the container and allow the approved aluminum closure to retain it |
Selection checkpoint: This is a 20 mm crimp closure, not a 20 mm screw cap. Do not use it on a screw-thread bottle or assume compatibility with every container labeled 20 mm without reviewing the actual finish.
Complete Tear-Off versus Open Top, Center Disc Tear-Out, and Solid Top
WHEATON offers multiple aluminum seal styles because the required method of accessing a closed container varies by application. Select the closure based on how the contents will be accessed after the initial crimp.
| Seal Style |
20 mm Natural SKU |
Access Characteristics |
| Complete Tear-Off |
224193-01 |
Entire aluminum seal can be removed for full container access |
| Open Top |
224178-01 |
Center opening exposes the stopper for syringe access when appropriate |
| Center Disc Tear-Out |
224183-01 |
Central metal disc is removed; the remaining skirt stays crimped in place |
| Solid Top |
224191 |
Metal top covers the stopper; access requires appropriate seal removal |
These part numbers are separate manufacturer products. The selected closure style does not, by itself, validate a particular stopper, syringe-access procedure, or sample-storage condition.
Access method matters: Select 224193-01 when the entire metal closure must be removed. If repeated syringe access is required without removing the crimped skirt, assess an appropriate open-top or center-access closure and compatible stopper system.
WHEATON 224193 series: 20 mm complete tear-off color options
The WHEATON 224193 family includes multiple colors with the same nominal 20 mm complete tear-off style. Color selection can support a laboratory's visual identification system, but does not by itself establish a different sealing or chemical resistance specification.
| DWK Catalog Number |
Color |
Style |
Case Quantity |
| 224193-01 |
Natural |
Complete Tear-Off |
1,000 |
| 224193-05 |
Blue |
Complete Tear-Off |
1,000 |
| 224193-06 |
Red |
Complete Tear-Off |
1,000 |
| 224193-07 |
Green |
Complete Tear-Off |
1,000 |
DWK's manufacturer product records specify an inner pack quantity of 100 for the standard 224193 color variants. Each color requires its own part number and should be ordered separately.
Unlined aluminum construction: what is and is not included
The term unlined identifies an aluminum seal that does not contain a preassembled liner. It does not mean that a laboratory can obtain a fully qualified liquid-tight closure without selecting the appropriate stopper or sealing component.
In a conventional crimp-closed vial or serum bottle assembly, the stopper is the primary barrier between the contents and the external environment. Aluminum retention is necessary to hold that stopper in place, but the aluminum itself is not a substitute for the stopper's sealing properties.
- Aluminum Seal: Included under catalog number 224193-01.
- Integrated Liner: Not included; product is unlined.
- Rubber Stopper: Separately selected component.
- PTFE-Faced Stopper: Not included with this seal.
- Laboratory Vial or Bottle: Not included.
- Crimping Tool: Not included.
- Finished Container Assembly: Must be assembled and evaluated using the selected components.
Material selection: The absence of an integrated liner gives the laboratory responsibility for selecting the stopper material and geometry. Do not assume an unlined aluminum seal is chemically compatible with every fluid or is itself a primary sample-contact barrier.
Stopper material selection: elastomer compatibility and closure integrity
DWK offers separate laboratory and pharmaceutical stoppers in materials including bromobutyl, chlorobutyl, silicone, and other elastomer formulations. A 20 mm nominal designation is the starting point for selection, not proof that every stopper is suitable for a specific container or process.
A complete closure evaluation should consider the stopper's sealing geometry, elastomer composition, surface treatment, expected chemical exposure, puncture requirements, and the mechanical conditions imposed during crimping.
- Geometry: Match stopper flange and plug design to the selected container finish.
- Elastomer: Choose based on chemical compatibility, process requirements, and required barrier performance.
- Surface Treatment: Confirm any silicone, fluoropolymer, or other coating requirements.
- Needle Access: Select a suitable stopper and access-style seal if puncturing is required.
- Sterilization: Qualify stopper, vial, and seal processing as a complete system when applicable.
- Closure Integrity: Establish the necessary testing and acceptance criteria under the approved quality program.
No particular stopper formulation or stopper part number is established as universally compatible with 224193-01. Confirm the complete bottle-and-stopper configuration before assigning an approved assembly.
Crimping technique: tool selection, adjustment, and finished-seal inspection
A properly applied crimp engages the aluminum skirt beneath the compatible vial or bottle finish, retaining the stopper. DWK notes that crimp quality depends on correct tool calibration and that a finished seal should be inspected after application.
The crimping tool must be suitable for the closure dimensions and the approved container system. Incorrect tool adjustment or a mismatched head may result in insufficient retention, distorted aluminum, stopper movement, or glass damage.
- Verify the components: Confirm the 20 mm vial or bottle, appropriate stopper, and catalog 224193-01 seal.
- Inspect the neck: Check the container finish for chips, cracks, irregularities, or contamination.
- Seat the stopper: Follow the approved process for stopper placement and seating.
- Position the seal: Place the aluminum closure correctly over the stopper and container finish.
- Select the correct tool: Use an appropriate 20 mm crimping head and the required equipment setup.
- Apply the crimp: Follow the tool manufacturer's operating and adjustment instructions.
- Inspect the skirt: Check that the closure is consistently formed and retained without visible damage.
- Check the stopper: Confirm the approved seating condition and absence of visible displacement.
- Verify performance: Perform any required integrity, retention, or leak testing for the intended application.
Crimp-quality checkpoint: Do not assume that a visually attached aluminum cap guarantees container closure integrity. DWK recommends regular crimp-tool calibration and inspection of the quality of every crimp.
For the manufacturer's hand-operated crimping equipment, consult the applicable instruction manual and select the correct tool head for the approved closure system. No universal tool adjustment, compression value, or crimping force is assigned to 224193-01 here.
Complete tear-off removal: access, operator safety, and single-use controls
The principal distinguishing feature of 224193-01 is that the aluminum closure can be removed completely. This enables access to the stopper and, following the approved stopper-removal procedure, allows the container contents to be poured.
Because removal disrupts the aluminum retaining structure, the used seal should not be treated as a reusable crimp closure. If a container must be closed again, a new compatible closure should be selected and the approved resealing process followed.
- Removal: Use the designated tear-off feature according to the laboratory procedure.
- Operator Protection: Avoid contact with sharp or irregular aluminum edges created during removal.
- Container Protection: Do not apply excessive force to the glass neck or stopper.
- Contamination Control: Prevent metal fragments or exterior contamination from entering the container.
- Discard: Dispose of used aluminum closures in the appropriate waste stream.
- Reclosure: Do not attempt to reapply a completely removed tear-off seal.
Important distinction: Complete tear-off removal visibly disrupts the original closure, but the reviewed product specification does not establish a validated tamper-evidence or tamper-resistance rating. Do not import such claims from a different flip-cap or pharmaceutical closure design.
Aluminum material considerations and chemical compatibility
The WHEATON® 224193-01 seal is made from aluminum. The manufacturer does not specify an aluminum alloy, coating composition, or protective-layer thickness in the reviewed SKU record.
In a conventional stoppered container, the aluminum retaining closure is external to the primary sample-contact interface. Nevertheless, accidental exposure, chemical splash, atmospheric conditions, cleaning agents, and storage conditions may affect the aluminum component and should be evaluated as needed.
- Aluminum: External mechanical retaining component.
- Natural Color: Manufacturer-designated natural aluminum appearance.
- Primary Seal Material: Determined by the separately selected stopper.
- Chemical Contact: Evaluate any process conditions exposing the metal to reagents or corrosive environments.
- Cleaning Chemicals: Confirm suitability before introducing chemical cleaning or disinfection agents.
- Alloy and Coating: Exact material grade and coating specifications require manufacturer confirmation where essential.
Do not assume that the aluminum seal has the same chemical resistance as a glass vial, rubber stopper, or fluoropolymer-faced liner. Each component contributes different properties to the finished container system.
Supplied sterility, processing, and cleanroom suitability
The reviewed manufacturer record does not identify catalog 224193-01 as supplied sterile or ready-to-use for aseptic processing. It also does not provide a product-specific sterilization cycle, sterility assurance level, endotoxin limit, or validated particulate cleanliness specification.
Unlined aluminum seals should not be assumed to be cleanroom processed, sterilized, or independently qualified for pharmaceutical use solely because aluminum crimp closures are commonly used in regulated container systems.
- Supplied Sterility: Not established by the reviewed DWK SKU record.
- Sterility Assurance Level: Not specified.
- Autoclave Cycle: No SKU-specific validated cycle identified.
- Depyrogenation: No product-specific validated procedure identified.
- Endotoxin Specification: Not identified.
- ISO Cleanroom Cleanliness: No SKU-specific rating identified.
- Particulate Specification: No finished-product quantitative limit identified.
- Regulated Applications: Require qualification of the actual closure components and processing sequence.
Controlled-environment boundary: General laboratory closure products are not automatically suitable for direct aseptic introduction. Facilities must establish the correct material preparation, transfer, sterilization, and qualification procedures where required.
Storage and handling of unused aluminum seals
Unused aluminum seals should be protected from mechanical damage, contamination, and conditions that could deform the crimp skirt or tear-off structure. Because the product is supplied in inner packs of 100, material dispensing and inventory handling can be organized around the manufacturer's defined package configuration.
- Keep protected: Retain unused seals in appropriate packaging until required for use.
- Prevent deformation: Avoid crushing or damaging the aluminum skirt.
- Control contamination: Use suitable clean handling equipment when the application requires it.
- Separate variants: Prevent accidental mixing of tear-off, open-top, center-disc, and solid-top styles.
- Maintain identification: Retain catalog number, lot information when available, and package status under the laboratory's procedure.
- Protect tear-off features: Avoid damage that might interfere with controlled removal.
The reviewed product listing does not establish a specific storage temperature, shelf-life period, or humidity tolerance for the finished seal. Obtain manufacturer confirmation when a controlled storage specification is required.
Receiving, packaging, and inspection checklist
DWK specifies 100 seals per inner pack and 1,000 seals per manufacturer case. Laboratories maintaining controlled purchasing processes should confirm the catalog number, color, size, and style on receipt.
- Verify Manufacturer SKU: Confirm 224193-01 against the purchase order.
- Confirm Size: Verify the 20 mm nominal crimp-seal designation.
- Confirm Color: Verify natural aluminum rather than blue, red, or green.
- Confirm Seal Style: Check that the product is complete tear-off rather than open-top or center-disc tear-out.
- Check Package Quantity: Confirm the order unit is a case of 1,000 with inner packs of 100.
- Inspect Packaging: Look for damaged, contaminated, or disturbed packages.
- Inspect Representative Seals: Check for bent skirts, damaged tear-off features, deformation, or visible foreign matter.
- Verify Other Components: Confirm that the required stopper, vial or bottle, and crimping equipment have been ordered separately.
- Record Disposition: Document acceptance, rejection, or additional inspection under the facility's quality procedure.
Receiving checkpoint: The inner pack quantity is 100, but the published manufacturer order quantity is 1,000. Do not create a 100-count selling unit in the purchasing system without confirming that SOSCleanroom actually offers that configuration.
Technical FAQs
What is the difference between complete tear-off and center-disc tear-out?
Complete tear-off allows the entire aluminum closure to be removed. Center-disc tear-out removes only the central metal disc, leaving the crimped aluminum skirt on the container.
Does 224193-01 include a rubber stopper?
No rubber stopper or septum is identified as included with the unlined aluminum seal. These are separate components of a complete vial or bottle closure system.
What does unlined mean?
It means the aluminum seal is not supplied with a preassembled sealing liner. A compatible stopper must be selected separately when a stoppered container system is required.
Does the seal fit every bottle with a 20 mm opening?
No. A 20 mm crimp seal must match the container's nominal crimp-finish geometry. The internal opening diameter is not the same as the outside mouth diameter used to select the seal.
Can the seal be used on a 20 mm screw-thread bottle?
Not as a normal screw closure. This product is a crimp-on aluminum seal intended for compatible crimp finishes, not screw threads.
How many seals are supplied?
DWK specifies an inner pack quantity of 100 and a manufacturer case quantity of 1,000.
Is natural the same as silver?
The current DWK product record uses Natural. Manufacturer technical literature also uses Silver for the same catalog number. The product has a natural, silver-colored aluminum appearance.
Does the product arrive sterile?
The reviewed manufacturer record does not establish a supplied-sterile designation or validated sterilization process for this SKU.
Can the aluminum seal be reused after complete removal?
No. Complete tear-off removal disrupts the retaining closure. A new compatible seal should be used if the container must be crimp-sealed again.
Does complete tear-off provide guaranteed tamper evidence?
Removing the aluminum seal visibly disrupts the closure. However, the reviewed manufacturer record does not specify a validated tamper-evidence performance standard for 224193-01.
What tool is required to install the seal?
An appropriate 20 mm crimping tool is needed. Select the tool and crimping head according to the approved container, stopper, and aluminum seal configuration.
Is the aluminum seal itself a leakproof or sterile barrier?
No standalone leakproof or sterile-barrier performance is established. The finished closure system must be evaluated with its container, stopper, crimping process, and actual contents.
Why purchase WHEATON aluminum seals from SOSCleanroom
- Exact SKU control: SOSCleanroom helps customers distinguish tear-off, open-top, center-disc, and solid-top closure configurations.
- Technical product sourcing: Our team can assist with identifying the correct nominal seal size, color, and manufacturer package configuration.
- Container and closure coordination: Request assistance sourcing related laboratory vials, serum bottles, stoppers, and specialty consumables.
- Manufacturer information: Ask for help locating available product specifications and supporting technical documentation.
- Procurement support: Confirm case quantities and purchasing requirements before establishing recurring supply.
- Responsive service: Contact SOSCleanroom for quotations, availability, and product identification assistance.
Manufacturer documentation and authoritative technical references
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WHEATON E-Z Crimper Instruction Manual:
Review Manufacturer Crimping Tool Instructions (PDF)
— handling, adjustment, maintenance, and operating information for the specified 8–20 mm manual crimping tool family. Follow instructions for the exact tool and compatible closure assembly.
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Aluminum Seal Specifications: DWK Life Sciences product information confirms the 20 mm natural complete tear-off configuration, 100-count inner pack, and 1,000-count case.
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Product Qualification Documentation: Contact SOSCleanroom for assistance requesting available material, traceability, packaging, or processing information from DWK Life Sciences.
The manufacturer documentation supports product identification and general crimping principles. It does not establish that an individual vial, stopper, and seal combination has passed container closure integrity testing.
If you have any questions please email us at Sales@SOSsupply.com or give us a call at (214) 340-8574.
For additional product guidance, use the SOSCleanroom AI ChatBot or contact our team for manufacturer documentation assistance.
Technical insight: A 20 mm aluminum seal is only one component of a complete crimp-closed container. Correct stopper selection, vial geometry, crimp quality, and process qualification are necessary for the intended performance.
Last updated: October 28, 2026
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