INDUSTRY COMPONENT

Secondary Seal (O-ring/Gasket)

Secondary seal (O-ring/gasket) is a critical sealing component in gas seal assemblies that provides backup containment and prevents leakage in mechanical systems.

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Component Specifications

Definition
A secondary seal, typically in the form of an O-ring or gasket, is installed in gas seal assemblies as a redundant sealing mechanism to contain process fluids or gases. It operates in conjunction with primary seals to enhance system reliability by providing an additional barrier against leakage, particularly during primary seal failure, pressure fluctuations, or thermal cycling. This component ensures operational safety and environmental compliance in industrial applications.
Working Principle
The secondary seal functions by creating a physical barrier through elastic deformation when compressed between mating surfaces. It fills microscopic gaps and irregularities, preventing fluid or gas passage. In gas seal assemblies, it typically operates under static or low-dynamic conditions, maintaining sealing integrity through material resilience and proper gland design, even when the primary seal experiences wear or transient pressure changes.
Materials
Common materials include Nitrile Rubber (NBR) for oil resistance, Fluorocarbon (FKM/Viton) for chemical and high-temperature applications, Ethylene Propylene Diene Monomer (EPDM) for steam and weathering resistance, and Polytetrafluoroethylene (PTFE) for extreme chemical compatibility. Material selection depends on temperature range (-40°C to 250°C), pressure (up to 1000 psi), media compatibility, and environmental factors.
Technical Parameters
  • Hardness 70-90 Shore A
  • Inner Diameter 5-500 mm
  • Compression Set <25%
  • Pressure Rating Up to 1000 psi
  • Tensile Strength 10-25 MPa
  • Temperature Range -40°C to 250°C
  • Cross-Section Diameter 1.5-10 mm
Standards
ISO 3601, DIN 3771, AS 568A, SAE J515

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Secondary Seal (O-ring/Gasket).

secondary seal O-ring gasket gas seal assembly backup seal industrial sealing mechanical seal leakage prevention sealing components FMEA risks Secondary Seal (O-ring/Gasket) Secondary Seal (O-ring/Gasket) in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Gas Seal Assembly

A critical sealing component within a rotary gas injector that prevents gas leakage between rotating and stationary parts.

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Engineering Analysis

Risks & Mitigation
  • Compression set leading to seal failure
  • Chemical degradation from process media
  • Thermal aging at high temperatures
  • Improper gland design causing extrusion
  • Installation damage during assembly
FMEA Triads
Trigger: Material incompatibility with process fluids
Failure: Swelling, cracking, or chemical degradation of seal
Mitigation: Conduct material compatibility testing and select appropriate elastomer compounds (e.g., FKM for aggressive chemicals)
Trigger: Excessive compression beyond design limits
Failure: Permanent deformation (compression set) and loss of sealing force
Mitigation: Follow gland design standards (ISO 3601) and maintain proper compression ratios (typically 15-30%)
Trigger: Thermal cycling beyond material limits
Failure: Thermal aging, hardening, and loss of elasticity
Mitigation: Select materials with appropriate temperature ratings and consider thermal expansion in gland design

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.10 mm on cross-section diameter, ±0.15% on inner diameter per ISO 3601-1
Test Method
Leakage testing per ISO 15848, compression set testing per ASTM D395, material verification per ASTM D2000

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

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 is the difference between primary and secondary seals in gas seal assemblies?

Primary seals handle main operational sealing under normal conditions with dynamic movement, while secondary seals provide backup containment during primary seal failure, pressure surges, or maintenance periods, typically operating under static conditions.

How often should secondary seals be replaced in industrial equipment?

Replacement intervals depend on operating conditions, but typically range from 12-36 months. Regular inspection for compression set, cracking, or chemical degradation is recommended during maintenance shutdowns.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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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