Ningbo Zhonggao Rubber & Plastic Manufacturing Co., Ltd. is one of the most reliable manufacturers and suppliers of encapsulated o ring in China. The company has world-leading production equipment and strong manufacturing capabilities. Welcome to wholesale custom made encapsulated o ring from our factory.
What Are Encapsulated O Rings
Encapsulated O rings usually combine an elastomer core with a seamless FEP, PFA and PTFE outer jacket. The elastic core provides compression and recovery, while the fluoropolymer coating offers excellent chemical resistance, low friction, and contamination control, making them suitable for demanding sealing environments where standard rubber O rings may not perform reliably.
Industry Applications
Chemical Processing
Chemical processing equipment frequently handles acids, alkalis, solvents, and other aggressive media. Encapsulated O rings provide chemically resistant sealing for pumps, valves, reactors, pipelines, and dosing systems operating in corrosive environments.
Pharmaceutical Manufacturing
Pharmaceutical production requires clean and reliable sealing under strict hygiene standards. Encapsulated O rings help support contamination-resistant sealing in processing equipment, fluid transfer systems, and cleaning applications.
Food & Beverage Processing
Food processing systems are exposed to cleaning chemicals, temperature fluctuations, and frequent washdown. Encapsulated O rings are commonly used in production, filling, mixing, and packaging equipment requiring hygienic sealing performance.
Semiconductor & Electronics
Semiconductor and electronics manufacturing often involves ultra-pure chemicals and sensitive processing environments. Encapsulated O rings support clean sealing solutions for chemical delivery systems, processing equipment, and fluid handling applications.
Water Treatment
Water treatment facilities use various chemicals for filtration, purification, and dosing processes. Encapsulated O rings provide durable sealing for pumps, valves, pipelines, and treatment equipment exposed to challenging operating conditions.
Aerospace & Defense
Aerospace and defense equipment requires sealing materials capable of handling harsh environments and demanding media exposure. Encapsulated O rings are used in fluid systems, control equipment, and specialized sealing applications where chemical resistance is critical.
Equipment Applications
Pumps & Valves
Used for sealing pump housings, valve assemblies, and fluid control systems exposed to aggressive chemicals, helping maintain reliable sealing performance during operation.
Reactors & Mixing Equipment
Applied in reactors, mixers, and processing vessels where corrosive media and frequent cleaning cycles require durable and chemically resistant sealing solutions.
Pipe Flange Connections
Installed in pipeline systems and flange connections to help prevent leakage when transporting chemicals, solvents, purified water, or process fluids.
Filling & Packaging Equipment
Used in filling, dispensing, and packaging machinery requiring clean sealing performance and resistance to cleaning agents and production chemicals.
Filtration Systems
Suitable for filtration and purification equipment where seals may come into contact with process chemicals, cleaning solutions, and treated fluids.
Instrumentation & Process Control Equipment
Applied in sensors, analyzers, dosing units, and process control systems requiring compact seals with reliable chemical compatibility.
Material Properties
Good airtightness
Encapsulated O ring combines the elasticity of rubber with the excellent performance of coating. Even if the outer layer is slightly worn, the rubber core can still provide reliable sealing.
Extremely low friction coefficient
PTFE and other outer coatings have smooth surfaces and low friction coefficients (0.05-0.2), which are suitable for dynamic sealing (such as reciprocating motion and rotary sealing).
Excellent chemical resistance
The outer coating material (such as PTFE, PFA) can resist corrosive media such as strong acids, strong alkalis, organic solvents, etc., and is suitable for harsh environments such as chemical and pharmaceutical industries.
Anti-stick and cleanliness
The surface of O Ring does not adhere to the medium and is suitable for industries with high cleanliness requirements such as food, semiconductors, and medical treatment.
Wide temperature adaptability
The outer material of the O-ring (such as PFA) can withstand -200°C to +260°C, which is more adaptable to extreme temperature environments than ordinary rubber.
Excellent wear resistance
The coating protects the rubber core from wear and tear, extending the service life of the seal.
Technical Parameters
|
Parameter Category |
Technical Item |
Reference Value / Range |
Notes |
|
Thermal Performance |
Service Temperature |
-60°C to +260°C |
Depends on core elastomer and PTFE/FEP/PFA jacket |
|
Short-Term Heat Resistance |
Up to +300°C |
Short exposure only |
|
|
Low Temperature Resistance |
Down to -60°C |
Varies by elastomer core |
|
|
Mechanical & Physical Properties |
Hardness |
Typically 70–90 Shore A (core dependent) |
Determined by elastomer material |
|
Compression Set Resistance |
Excellent |
Helps maintain long-term sealing force |
|
|
Elastic Recovery |
High |
Provided by elastomer core |
|
|
Flexibility |
Better than solid PTFE seals |
Suitable for dynamic installation conditions |
|
|
Pressure & Sealing Parameters |
Operating Pressure |
Up to 20 MPa |
Depends on gland design and operating conditions |
|
Vacuum Performance |
Suitable for vacuum service |
Commonly used in vacuum systems |
|
|
Leakage Rate |
Extremely Low |
Suitable for critical sealing applications |
|
|
Seal Integrity |
Continuous Encapsulation |
Prevents media penetration to core material |
|
|
Chemical Properties |
Chemical Resistance |
Near Universal Chemical Compatibility |
PTFE/FEP/PFA outer jacket resists most chemicals |
|
pH Range |
0–14 |
Suitable for strong acids and alkalis |
|
|
Solvent Resistance |
Excellent |
Resistant to most industrial solvents |
|
|
Corrosion Resistance |
Excellent |
Suitable for aggressive chemical environments |
|
|
Electrical Properties |
Dielectric Strength |
Excellent Insulating Properties |
PTFE-based jacket material |
|
Water Absorption |
Nearly 0 |
Suitable for wet environments |
Why Encapsulated O Rings Matter for Your Application
Encapsulated O rings combine the chemical resistance of PTFE with the elasticity of a rubber core, making them suitable for sealing applications exposed to aggressive chemicals, high-purity media, and demanding operating environments. However, differences in media compatibility, temperature range, pressure conditions, and installation design can significantly affect sealing performance.
Selecting the appropriate encapsulation material, core elastomer, size, and tolerance helps improve sealing reliability, reduce leakage risks, extend service life, and support stable equipment operation.
Our Encapsulated O Ring Services
As a custom sealing solutions manufacturer, we provide OEM and ODM support based on your drawings, samples, or application requirements. Our services include material selection, seal design optimization, mold development, prototyping, custom sizing, production, and quality inspection to help you source encapsulated O rings that match your equipment and operating conditions.
|
Capability |
What Can Be Customized |
|
Size |
Standard AS568 Sizes, Metric Sizes, ID, OD and Cross Section Diameter |
|
Shape |
Round, Square, Rectangular or Special Profiles |
|
Material |
PTFE Coating, PFA Coating, FEP Coating, ETFE Coating, NBR Core, FKM Core, EPDM Core, Silicone Core |
|
Ring Configuration |
Standard Endless Rings, Welded Endless Rings, Large Diameter Rings, Custom Cross Sections |
|
Processing |
Standard Molded, Large Diameter, Custom Profile, Precision Welded |
|
Order Type |
Samples, Prototype Orders, Production Orders, OEM Projects |
Types of Encapsulated O Rings We Can Customize
We customize encapsulated O rings based on sealing media, operating conditions, groove design, installation requirements, and industry standards to help match different equipment and application needs.
Standard Encapsulated O Rings
Used for general industrial sealing applications where standard sizes and conventional groove designs are required.
Large Diameter Encapsulated O Rings
Suitable for large vessels, tanks, reactors, processing equipment, and oversized sealing interfaces requiring larger inside diameters.
Custom Cross-Section Encapsulated O Rings
Designed for applications requiring non-standard cross-sections to accommodate specific sealing grooves, compression requirements, or equipment structures.
Hollow Encapsulated O Rings
Used in applications requiring lower compression force and improved sealing performance on delicate or uneven sealing surfaces.
Solid Core Encapsulated O Rings
Suitable for higher-pressure applications requiring greater structural stability and compression resistance.
Special Profile Encapsulated O Rings
Manufactured with customized profiles to meet unique sealing challenges, special groove configurations, or equipment-specific requirements.
Customized Specifications
Encapsulated O rings can be tailored to your equipment design, sealing environment, industry standards, and procurement requirements. From dimensions and materials to profiles, tolerances, and packaging, we support flexible customization for prototypes, pilot runs, and volume production.
Custom encapsulated O rings can be manufactured according to drawings, samples, gland dimensions, or application requirements to ensure proper sealing performance and installation fit.
AS568 Encapsulation: Manufactured according to AS568 inch-size standards for compatibility with standard sealing systems.
Metric Encapsulation: Produced according to metric dimensions commonly used in international industrial applications.
ID: Customized to match shaft, bore, gland, or equipment sealing dimensions.
OD: Controlled according to installation space and groove design requirements.
Cross Section Diameter: Selected based on sealing pressure, compression rate, installation requirements, and service conditions.
Different shapes and profiles can be customized to accommodate various sealing structures and equipment configurations.
Round: The most common design for static and dynamic sealing applications.
Square: Suitable for specific groove designs and specialized sealing requirements.
Rectangular: Used in equipment requiring non-circular sealing geometries.
Special Profiles: Custom profiles can be developed for unique sealing interfaces, installation spaces, or performance requirements.
Different material combinations can be selected according to chemical compatibility, operating temperature, media type, pressure conditions, and service environment.
PTFE Coating: Suitable for applications requiring extremely low friction, excellent chemical resistance, and non-stick performance.
PFA Coating: Suitable for applications requiring enhanced chemical resistance, higher mechanical strength, and elevated temperature resistance.
FEP Coating: Suitable for applications requiring excellent chemical compatibility, high flexibility, and improved transparency.
ETFE Coating: Suitable for applications requiring superior impact resistance, radiation resistance, and mechanical durability.
NBR Core: Suitable for applications involving oils, fuels, hydraulic fluids, and general industrial media.
FKM Core: Suitable for applications requiring resistance to high temperatures, oils, fuels, solvents, and aggressive chemicals.
EPDM Core: Suitable for applications involving water, steam, weather exposure, and cleaning chemicals.
Silicone Core: Suitable for applications requiring flexibility and reliable sealing performance across a wide temperature range.
Custom encapsulated O rings can be manufactured according to international size standards, non-standard groove designs, and project-specific sealing requirements.
Common Standards: AS568, Metric, DIN, JIS, and other internationally recognized O-ring size standards.
Custom Dimensions: Inside diameter, cross-section, and dimensional tolerances can be customized to fit non-standard grooves and specialized equipment designs.
Specialized: Custom packaging, labeling, kitting, and identification options are available to support inventory management, assembly processes, and supply chain requirements.
Packaging can be arranged according to order quantity, product size, transportation requirements, and OEM supply needs.
Bulk Packaging: Suitable for standard products, large-volume orders, and routine production supply.
Labeled Packaging: Product size, material combination, quantity, batch number, and customer part number can be marked for easier identification and inventory management.
OEM Packaging: Packaging format, labeling requirements, and project-specific packing methods can be customized according to customer requirements.
Manufacturing Process
We use a controlled encapsulation process to manufacture custom encapsulated O-rings tailored to ring size, material combination, sealing requirements, and application conditions.
Core Material Preparation
The silicone or FKM elastomer core is prepared to meet the required cross-section and sealing performance, providing flexibility and elastic recovery.
FEP/PFA Jacket Extrusion
A uniform FEP or PFA jacket is extruded with controlled wall thickness to provide chemical resistance and media protection.
Core Encapsulation & Ring Forming
The elastomer core is inserted into the fluoropolymer jacket and formed into the required ring diameter and configuration.
Thermal Fusion & Quality Inspection
The joint area is thermally fused and inspected to verify dimensional accuracy, jacket integrity, and overall sealing quality.
Our controlled encapsulation process enables us to manufacture standard and custom encapsulated O-rings for chemical processing, pharmaceutical, food, pump, valve, and other demanding industrial applications.
Quality Control
To help ensure that each Encapsulated O ring matches your drawing, sample, equipment interface, and sealing requirements, we apply strict quality checks from material confirmation to final packaging. This helps reduce production errors, improve installation fit, and support more consistent repeat orders.
- Material Confirmation: checks the selected Encapsulated type and material requirement before production
- Drawing Review: verifies size, hole position, shape, and tolerance to reduce production errors
- Dimension Inspection: checks ID, OD, thickness, and hole distance for proper installation fit
- Surface Check: reviews burrs, deformation, and edge quality to support better sealing performance
- Batch Check: confirms quantity, labeling, and packaging consistency for easier storage, delivery, and repeat orders
Order Support from Sample to Delivery
We support custom Encapsulated O ring orders from sample confirmation to bulk production and delivery. Whether you need a trial sample, repeated wholesale supply, OEM packaging, or technical assistance before production, our team can help make the sourcing process more efficient and reliable.
- Sample support before bulk production.
- Packaging by size, material, drawing number or batch.
- Support for wholesale and bulk Encapsulated O ring orders.
- Technical consultation for material selection and drawing confirmation.
- Assistance with required inspection or audit documents when available.
FAQ
Q: How Does an Encapsulated O Ring Work?
A: An encapsulated O-ring creates a seal by compressing the elastomer core while the PTFE outer layer provides resistance to chemicals, temperature, and media exposure. This combination helps maintain sealing reliability in demanding operating environments.
Q: FEP vs PFA Encapsulated O Rings: What Is the Difference?
A: FEP encapsulated O rings are commonly used for general chemical sealing applications and offer good chemical resistance. PFA encapsulated O rings provide higher temperature capability, improved flexibility, and enhanced performance in more demanding operating conditions.
Q: Silicone Core vs FKM Core: Which Should I Choose?
A: Silicone cores are often selected for applications requiring flexibility and performance across a wide temperature range. FKM cores are typically preferred for environments involving oils, fuels, solvents, and higher operating temperatures.
Q: Are Encapsulated O Rings FDA Compliant?
A: Yes. FDA-compliant encapsulated O rings can be manufactured using appropriate PTFE encapsulation materials and elastomer cores for food processing, beverage, pharmaceutical, and other regulated applications. Material selection can be customized according to specific compliance requirements.
Q: How Are Encapsulated O-Ring Joints Sealed?
A: Encapsulated O-rings are typically sealed through a controlled thermal fusion process that creates a continuous fluoropolymer barrier. This helps maintain joint integrity, chemical resistance, and reliable sealing performance in demanding environments.
Q: Can You Manufacture Custom Sizes and Cross Sections?
A: Yes. Encapsulated O rings can be customized according to drawings, samples, groove dimensions, or application requirements. Inside diameter, cross-section, material combination, tolerance, and packaging can be adjusted to meet different OEM sealing needs.
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