Structured Manufacturing Data (2026)

Sealing Flange

Based on aggregated insights from structured factory profiles within the CNFX directory, the standard Sealing Flange used in the Rubber and Plastic Product Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Sealing Flange is characterized by the integration of Sealing Lip and Compression Zone. In industrial production environments, manufacturers listed on CNFX commonly emphasize Pharmaceutical-grade elastomer (e.g., bromobutyl rubber) construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A specialized flange component designed to create a hermetic seal in pharmaceutical vial rubber stoppers.

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Product Specifications

Technical details and manufacturing context for Sealing Flange

Definition
The sealing flange is a critical component of pharmaceutical vial rubber stoppers that provides the primary sealing interface between the stopper and vial neck. It creates a hermetic barrier to prevent contamination, maintain sterility, and preserve the integrity of pharmaceutical products during storage and transportation.
Working Principle
The sealing flange operates through compression and elastic deformation when the rubber stopper is inserted into the vial neck. The flange's geometry and material properties create radial pressure against the vial's inner surface, forming a tight seal that prevents gas exchange, microbial ingress, and liquid leakage while allowing for needle penetration during administration.
Common Materials
Pharmaceutical-grade elastomer (e.g., bromobutyl rubber), Silicone rubber
Technical Parameters
  • Critical dimensions including outer diameter, inner diameter, flange thickness, and sealing surface geometry that ensure proper fit and sealing performance with standard pharmaceutical vials. (mm) Per Request
Components / BOM
  • Sealing Lip Part
    Primary contact surface that creates the hermetic seal against the vial
  • Compression Zone Part
    Area designed to deform elastically during stopper insertion to maintain sealing pressure
  • Transition Section Part
    Connects the sealing flange to the main stopper body while maintaining structural integrity

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Sealing Flange.

pharmaceutical vial rubber stopper sealing flange bromobutyl rubber sealing flange for vials hermetic seal flange pharmaceutical stopper medical-grade silicone rubber sealing component compression zone sealing lip transition section flange

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Optical Access Port
View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 10 bar (145 psi)
other spec: Flow Rate: N/A (static sealing component), Slurry Concentration: Not applicable for hermetic sealing applications
temperature: -40°C to 150°C
Media Compatibility
✓ Pharmaceutical-grade silicone elastomers ✓ EPDM rubber stoppers ✓ Aqueous injectable solutions
Unsuitable: Organic solvents (e.g., acetone, toluene)
Sizing Data Required
  • Vial neck outer diameter (OD)
  • Stopper compression force requirement
  • Required seal integrity level (e.g., helium leak rate specification)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Gasket compression failure
Cause: Insufficient bolt torque leading to uneven compression and loss of seal integrity
Flange face corrosion/pitting
Cause: Chemical attack from process fluids or environmental exposure compromising sealing surfaces
Maintenance Indicators
  • Visible fluid leakage at flange joint
  • Audible hissing or whistling sound indicating pressure loss
Engineering Tips
  • Implement proper bolt torque sequence and tension monitoring during installation
  • Apply appropriate protective coatings and conduct regular surface inspection for early corrosion detection

Compliance & Manufacturing Standards

Reference Standards
ISO 5211:2017 - Industrial valves - Part-turn actuator attachments ANSI/ASME B16.5:2020 - Pipe Flanges and Flanged Fittings DIN EN 1092-1:2018 - Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN designated
Manufacturing Precision
  • Bore diameter: +/-0.05mm
  • Flatness: 0.08mm across entire sealing surface
Quality Inspection
  • Helium Leak Test for sealing integrity
  • Surface Roughness Test (Ra measurement) on sealing face

Factories Producing Sealing Flange

Manufacturer profiles with relevant production capability in China

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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What materials are used in pharmaceutical sealing flanges?

Our sealing flanges are manufactured using pharmaceutical-grade elastomers such as bromobutyl rubber and silicone rubber, ensuring compatibility with medical applications and maintaining hermetic seals.

How does the three-part BOM design improve sealing performance?

The compression zone applies consistent pressure, the sealing lip creates the primary barrier, and the transition section distributes stress evenly - together ensuring reliable hermetic sealing in vial stoppers.

Are these sealing flanges suitable for sterile pharmaceutical applications?

Yes, these flanges are specifically designed for pharmaceutical vial stoppers, meeting stringent requirements for sterility, chemical resistance, and maintaining hermetic seals in medical packaging.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data basis: CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks for Rubber and Plastic Product Manufacturing.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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