20 mm Serum Stopper
- Bromobutyl elastomer
- Bagged
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Closures & Accessories
Butyl Rubber Stoppers
Reliable elastomer closures for pharmaceutical, cosmetic, laboratory, and industrial packaging applications.
Numa supplies butyl rubber stoppers in multiple sizes and profiles for vials, bottles, containers, and other packaging requirements.
Serum profile · Butyl
- 12–34 mm
- Specification range
- 20
- Standard profiles
- Butyl
- Elastomer material
- Custom
- Sizes, colors & profiles
At a glance
Product Details
Butyl rubber is widely used in packaging because of its strong airtightness, chemical resistance, elasticity, and resistance to aging.
- Material
- Butyl rubber
- Typical Applications
- Pharmaceutical packaging, laboratory and research packaging, cosmetic packaging, chemical and industrial production, and vial and container closure systems
- Related Product Ranges
- Glass vials, aluminum crimp seals, flip-off caps, and multi-component quote support
Material performance
Key Characteristics
Available materials, dimensions, and profiles support a range of packaging, storage, and production requirements.
- Packaging ApplicationsAvailable for pharmaceutical, laboratory, cosmetic, chemical, and industrial packaging requirements.
- Airtight and Moisture ResistantHelps limit exposure to air and moisture during storage and handling.
- Chemical ResistanceButyl rubber offers resistance to a range of chemicals, making it suitable for pharmaceutical, laboratory, cosmetic, and industrial environments.
- Elastic and DurableThe material provides flexibility, compression recovery, and resistance to aging.
- Multiple ConfigurationsAvailable in a variety of diameters, plug profiles, top thicknesses, and total heights.
- Custom Sourcing SupportAlternative dimensions, materials, colors, and configurations may be available based on volume and application requirements.
Request details
What to Include in Your Request
Share your vial specifications, product drawings, quantity, and application details. We will review the request and follow up with available stopper options.
Helpful details
- Vial neck finish
- Opening diameter
- Stopper plug diameter
- Top diameter
- Seal or cap size
- Container material
- Intended packaging process
Standard profiles
Specifications and Dimensions
Standard butyl rubber stopper specifications. Alternative dimensions may be available on request.
All dimensions in mm
| Specification | Top Diameter | Top Thickness | Plug Diameter | Total Height |
|---|---|---|---|---|
| 12-D4 | 12.6±0.2 | 2.5±0.2 | 9.3±0.2 | 10.5±0.3 |
| 13-A1 | 12.5±0.2 | 2.0±0.25 | 7.5±0.1 | 6.7±0.3 |
| 13-A2 | 12.5±0.2 | 2.0±0.25 | 7.5±0.1 | 7.0±0.3 |
| 13-D1 | 12.5±0.2 | 2.2±0.25 | 7.5±0.2 | 12.2±0.3 |
| 13-D2 | 12.5±0.2 | 2.1±0.25 | 7.6±0.2 | 10.1±0.3 |
| 13-D2+ | 12.5±0.2 | 2.2±0.25 | 7.7±0.2 | 11.1±0.3 |
| 15-D4 | 15.6±0.2 | 2.5±0.25 | 12.1±0.2 | 12.7±0.3 |
| 20-A | 18.8±0.2 | 3.3±0.25 | 13.2±0.1 | 8.8±0.3 |
| 20-A1 | 18.8±0.2 | 3.3±0.2 | 12.9±0.2 | 8.5±0.3 |
| 20-A2 | 18.8±0.2 | 3.3±0.2 | 13.2±0.1 | 8.8±0.3 |
| 20-B2 | 19.5±0.2 | 3±0.25 | 13±0.1 | 8.7±0.3 |
| 20-B2+ | 19.5±0.2 | 3±0.25 | 13±0.1 | 8.7±0.3 |
| 24-A | 23.6±0.3 | 3.9±0.3 | 13.8±0.2 | 10.0±0.4 |
| 26-B | 25.5±0.3 | 3.8±0.3 | 15.2±0.2 | 11.0±0.4 |
| 26-B2 | 25.5±0.3 | 3.8±0.3 | 15.6±0.2 | 10.6±0.4 |
| 28-B | 26.6±0.3 | 3.8±0.3 | 18.0±0.2 | 11.8±0.4 |
| 28-B1 | 26.6±0.3 | 3.8±0.3 | 20.5±0.2 | 10.8±0.4 |
| 32-A | 30.8±0.3 | 4.0±0.3 | 23.6±0.2 | 12.2±0.4 |
| 32-A1 | 30.8±0.3 | 5.0±0.3 | 24.2±0.2 | 16.0±0.4 |
| 34-A | 33.6±0.25 | 4.6±0.2 | 26.2±0.2 | 14.6±0.35 |
Sourcing a size outside this range? Alternative dimensions, materials, and colors may be available —request a quote.
Before you order
Documentation and Availability
Product specifications, material information, packaging details, and supporting documentation may be available by product and order. Request documentation before ordering when specific performance, dimensional, or quality requirements apply.
Availability may vary by
- Stopper size
- Material formulation
- Color
- Packaging quantity
- Processing requirements
- Order volume
Related Product Ranges
Browse related vial, cap, and seal product ranges.
Product range
Available Stoppers
Request Pricing
Tell us which stopper size, quantity, and application you are sourcing for. Include your vial dimensions or product drawing when available so the request can be reviewed accurately.