Chengxin Industrial Seal King
Chengxin High-Performance Engineering Plastics: The Sealing Champion

Industrial Sealing Failures? We Provide Comprehensive Solutions—From Material Selection and Prototyping to Custom Mass Production

We supply PTFE, PCTFE, PEEK, PVDF, and FFKM sealing elements and engineering plastic parts. Please provide us with information on the medium, temperature, pressure, dimensions, and quantity, and we will assist with material selection, prototyping, custom machining based on drawings, and mass production evaluation.

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technical solution

Will your seals
 Extreme Environment Failure ？

You just replaced the seals, but the equipment started leaking again as soon as the pressure went up—are you going to shut it down again to replace them?

The material is clearly labeled as heat-resistant and corrosion-resistant, so why does it swell, become brittle, or corrode upon contact with the actual medium?

You just replaced the oil seal or sealing ring, but it’s already worn out and leaking oil from repeated operation—are you actually repairing it, or just waiting for the next shutdown?

Let us serve you

Let Chengxin Industrial Seal King Let me help you.

Chengxin Sealing King is a leading Taiwanese materials supplier with 20 years of expertise in engineering plastic seals, coordinating with various manufacturing plants across Taiwan.
From PTFE’s chemical resistance and low friction, PCTFE’s low-temperature airtightness, PEEK’s high strength and high-temperature resistance, and PVDF’s resistance to strong acids and alkalis, to FFKM’s high-temperature and corrosion resistance—we select the right materials based on the medium, temperature, pressure, and motion characteristics, and manufacture them into flange gaskets, O-rings, valve seats, oil seals, and custom sealing components. 。
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Six Core Advantages

−240°C to 300°C+ ｜From a single prototype to mass production of 1 million units

Sealing issues are usually not just a matter of materials. The medium, temperature, pressure, motion type, dimensions, quantity, and delivery schedule—if even one of these factors is off, it can lead to leaks, wear, downtime, or delivery delays.

Starting with these requirements, Chengxin systematically completed the following steps: material selection, processing according to drawings, sample approval, preparation of quality documentation, and transition to mass production.

20 Years of Sealing Element Materials | With experience in parts manufacturing, we provide consultation for a wide range of applications

Combination of PTFE, PEEK, PVDF, and FFKM MaterialsPTFE、PCTFE、PEEK、PVDF、FFKM, as well as composite formulations such as PTFE reinforced with glass fiber, carbon, graphite, PEEK, mica, and ceramics, selected based on requirements for wear resistance, compressive strength, low friction, antistatic properties, and chemical resistance.

Precision Machining Capabilities | Turning Drawings into Assembled Parts

Precision Machining and Dimensional Verification Based on DrawingsFrom round bars, sheets, tubes, and films, to O-ring, square rings, flat washers, rectangular washers, valve seats, sliders, andFlange Sealing Elements...all can be machined based on drawings, existing parts, inner and outer diameters, thickness, grooves, and quantity.
Helps you obtain parts that are dimensionally compatible and ready for direct assembly.

Technical Support | We Can Discuss Even If the Specifications Are Incomplete

Engineers Discuss Material Selection and Manufacturing SolutionsSimply provide photos of the existing part, its dimensions, the medium it comes into contact with, temperature, pressure, or the equipment’s intended use, and we can discuss everything from material selection and special specifications to sample production and mass production.
Helps you get started without having to wait for all the specifications to be finalized, so you canStart Reviewing the Procedure。

100% Yield Capabilities｜
Reducing the Risk of Batch Defects

Automated Inspection and Yield VerificationTo meet the demands of automated manufacturing, some production lines can achieve a yield rate of 100%, and batch verification is conducted based on product specifications.
Helps you reduce the risk of batch defects, rework, and equipment downtime,Confirm Batch Criteria。

Quality Assurance System | Documentation Delivered Along with the Product

Batch Quality and Document TraceabilityWe can provide original manufacturer documentation such as REACH, RoHS, FDA, COA, PFAS, and PFOS based on product requirements, along with information on materials, dimensions, quantities, and delivery details.
To ensure a smooth transition between R&D, quality control, and export processes,It has been confirmed that there is no need to resubmit the documents.。

Custom orders from one to one million units | A single point of contact for prototyping and mass production

From Prototyping to Mass Production and DeliveryWhether it’s a single-piece cut, a one-off order, a small-batch trial run, or mass production, we’re open to discussion—all managed through a single point of contact that coordinates materials, processing, documentation, and delivery.
Helping you make a smooth transition from a single prototype toMass Production and Supply。
High-performance

Six Major High performance Material Combination

Polyimide (PI)

The material of choice for extreme high-temperature performance
Exceptional high-temperature stability and mechanical strength, suitable for extreme environments of 260-300°C.

Polyvinylidene fluoride (PVDF)

A Reliable Partner in the Chemical Industry
Chemically resistant and UV-resistant, suitable for strong acids, alkalis, and organic solvents.

Polychlorotrifluoroethylene (PCTFE)

Low-Temperature and Hermetic Application Specialist
Exceptional low-temperature toughness, superior gas barrier properties, operating temperature down to -240°C.

Polyetheretherketone (PEEK)

Balance of Mechanical Strength and Chemical Stability
High strength, high-temperature resistance, chemical corrosion resistance, with a continuous operating temperature up to 260°C.

Polytetrafluoroethylene (PTFE)

The epitome of chemical inertness and low friction coefficient

Chemically inert with an extremely low coefficient of friction, providing exceptional self-lubricating properties.

Perfluoroelastomer (FFKM)

The Ultimate Solution for Elastic Seals
Combines chemical resistance with high-temperature resistance, operating at temperatures exceeding 300°C.
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Delivery Materials

Delivery Materials Checklist

01.

Bars

Multiple diameters and lengths to meet machining requirements.

02.

Sheet material

Available in multiple thicknesses and sizes, suitable for cutting and forming.

03.

Pipe

Various inner and outer diameters for fluid transmission and protection.

04.

Molded parts

Custom-made to design specifications, precision-formed.

Solve the challenge

On-site Challenges: High Temperatures, Corrosion, Leaks, and Frequent Replacement

On-site issues typically arise during equipment operation: for example, oil seal wear after hydraulic cylinder reciprocation; seal swelling in chemical pumps due to exposure to strong acids or alkalis; repeated leaks from flanges and valves under high temperature and pressure; or vacuum equipment failure caused by dimensional or fastening inconsistencies. Based on the medium, temperature, pressure, motion type, dimensions, and delivery schedule, Chengxin meticulously verifies every item—from materials and assemblies to sealing components—and refines the process into a manufacturable and deliverable solution.

High-Temperature/Low-Temperature Sealing

Does the equipment leak as soon as it heats up, and then lose its elasticity once it cools down?
In CNC machining centers and hydraulic cylinders, seals may harden, become brittle, or be forced out under thermal cycling and pressure; this results in downtime for disassembly, repair, and realignment.
Select materials based on upper and lower temperature limits, pressure, and clearance to reduce leakage after thermal cycling.

Strong Acids and Bases / Corrosive Substances

Does a newly replaced seal quickly swell, become brittle, or corrode after coming into contact with the chemical solution?
In chemical pumps, acid washing tanks, and solvent lines, if the materials are incompatible, the seals may lose their dimensions and hardness, leading to leaks, contamination, and even unplanned downtime.
First, assess media compatibility to avoid frequent replacement of parts over short cycles.

Flanges/Valve Leaks

Every bolt is secured, yet the flange joint keeps leaking?
An uneven flange surface, a gasket of the wrong size or thickness, insufficient compression, or a bolt tightening sequence that does not match the preload can all cause uneven stress distribution on the gasket; as soon as pressure is applied to the equipment, the leak reappears.
Verify the flange face, gasket dimensions, and fastening conditions all at once to break the cycle of constantly having to patch leaks.

Repetitive/Frequent Movement

You just replaced the oil seal, but after only a short period of operation, it’s already worn, scratched, and leaking oil?
In injection molding machines, hydraulic cylinders, and rotary shafts, seals are subjected to friction, heat, and the risk of extrusion during high-speed reciprocating motion, pressure cycles, and eccentric motion; simply replacing them with seals of the same specification is often just a matter of waiting for the next shutdown.
Low-friction materials, spring-assisted mechanisms, and anti-extrusion rings are configured according to the motion profile to extend maintenance intervals.
Solution

We offer solutions for every scenario

Chengxin Sealing King provides one-stop solutions for mass production of components, resolving product and equipment issues.

Chengxin Sealing King leverages its leading technology and extensive experience to provide diverse customized sealing solutions for various industries. Below is a showcase of our key product portfolio across different application fields, including sealing components belonging to the following four major sets, ensuring equipment operates efficiently and stably even in the most demanding environments.

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Sealing Materials

Select materials based on the medium, temperature, pressure, and mode of motion.PTFE、PCTFE、PEEK、PVDF、FFKM These are designed to meet chemical resistance, low-temperature, and high-temperature requirements, respectively; they help ensure more stable seal life and equipment operation.

Seal Kit

Flange、Valves、Hydraulic CylinderAs with reciprocating equipment, configure according to the seal locationSpring-Assisted Power, anti-extrusion rings, and auxiliary seals; helping you achieve more stable equipment operation and longer maintenance intervals.

Sealing Parts

從Flange Gasket、O-ring、Square Ring、Backup Ring、Seat Ring、Oil Seal, toHydraulics、Vacuum與Special Custom Parts; Provide drawings, old parts, photos, dimensions, equipment models, or operating conditions, and Chengxun will help you identify the part type, material, specifications, machining requirements, and lead time—ensuring that procurement and maintenance teams can quickly find the right parts, get all the necessary components, and locate them easily.

Sealing Solutions

Provide details on the medium, temperature, pressure, dimensions, quantity, and delivery date, and we’ll assist you with everything from material selection and prototyping to machining according to drawings and mass production evaluation. We’ll help you develop a viable sealing solution to reduce recurring leaks and delivery delays.
INCOMING MATERIAL VERIFICATION

FTIR Self-Test Procedure and Material Certification

Chengxin performs FTIR material verification, as well as dimensional and visual inspections on incoming materials; material certification and compliance documentation are provided based on original manufacturer or third-party documents.

Step 1 | Document VerificationMaterial certification and compliance documentation are provided based on the manufacturer’s or third-party documentation.
Level 2 | Incoming Material Self-InspectionIncoming materials undergo FTIR material verification, as well as dimensional and visual inspection.
Customer Testimonials

Customer Testimonials

After partnering with Chengxin to source materials, the solar energy manufacturer improved the design of all engineering components, resulting in more stable equipment sealing and component fit.

Solar Energy Companies

After collaborating with Chengxin on the material supply, we improved all the engineering components.

After receiving shipments from major brand suppliers, we assist in improving the manufacturing process to ensure that the sealing components better meet the equipment's operating conditions.

Major Brand Supplier

After purchasing and receiving the goods, assist in improving the manufacturing process.

A certain university has collaborated with Chengxin on research and development; communication has been smooth, and they have been able to work together to solve engineering problems.

A certain university

We work very well with the R&D team and are able to solve problems together.

Start your project immediately

Start your project now

Your equipment deserves the most advanced sealing solutions. By choosing Chengxin Seal King, you will achieve:Significantly improved yield rates, substantially reduced downtime, effectively lowered maintenance costs, and comprehensively enhanced production efficiency.Contact Chengxin's expert team immediately. Let us work together to tailor solutions that ensure your critical applications operate efficiently and reliably even in the harshest environments, propelling your innovation and productivity to new heights!

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Frequently Asked Questions

Frequently Asked Questions

If your issue remains unresolved, feel free to contact us for assistance by clicking the button below.
How to choose the most suitable material?

Material selection requires consideration of multiple factors including operating temperature, pressure, chemical media, and motion characteristics. Our application engineers will recommend the most suitable material solution based on your specific requirements, leveraging our material database and application expertise. When necessary, material compatibility testing and performance validation can be conducted to ensure the reliability of the selected materials.

How long is the delivery time?

Standard products typically ship within 3-5 business days, while custom machined parts require 7-15 business days depending on complexity. Rush orders can be expedited through our fast-track service for delivery within 48-72 hours. We understand the stringent delivery requirements of the manufacturing industry and will fully accommodate your production scheduling needs.

Do you provide sample testing?

Yes, we provide complimentary samples for customers to conduct preliminary testing and evaluation. For large-scale projects or long-term collaborations, we also support on-site trials and performance verification to ensure the product performs as expected under actual operating conditions, thereby reducing procurement risks.

Does the product come with a warranty?

All products come with a comprehensive quality guarantee, including Certificates of Conformity (COC), dimensional inspection reports, and performance test data. They comply with relevant industry standards and customer specifications. Should any losses occur due to product quality issues, we assume corresponding responsibility and provide solutions.

Can you provide technical training?
We offer a variety of technical training formats, including online courses, on-site training, and customized workshops. Content covers material properties, installation techniques, maintenance, and troubleshooting. We help your team build the right knowledge for product usage and maintenance to maximize product value.
How to handle failure issues?
We provide professional failure analysis services, identifying root causes through microscopic examination, material testing, and operational condition analysis. Based on the findings, we offer improvement recommendations that may include material replacement, design optimization, or operational condition adjustments. Our goal is to resolve issues completely and prevent recurrence.
How to choose the most suitable material?

Material selection requires consideration of multiple factors including operating temperature, pressure, chemical media, and motion characteristics. Our application engineers will recommend the most suitable material solution based on your specific requirements, leveraging our material database and application expertise. When necessary, material compatibility testing and performance validation can be conducted to ensure the reliability of the selected materials.

Blog Post

Eight Field Applications | What to Do on Site When a Failure Occurs

Starting with equipment that is leaking, showing signs of wear, or losing its seal, align on-site conditions with solutions that are available for purchase, can be manufactured, and are ready for delivery.

01｜Hydraulics

Hydraulic Cylinders for Injection Molding Machines

Hydraulic Cylinders for Injection Molding Machines

After reciprocating motion, the oil seal becomes scratched and begins to leak; as soon as the equipment pressure rises, it must be shut down for repair.

First, check the hydraulic cylinder’s oil seal, anti-extrusion ring, piston rod diameter, grooves, and clearances.
02｜Chemical Engineering

Chemical Pumps for Conveying Acid and Alkaline Solutions

Chemical Pumps for Conveying Acid and Alkaline Solutions

After coming into contact with the chemical solution, the seal swelled and softened, and began to leak again shortly thereafter.

Compatible with: Chemical-resistant seals; material selection based on acid and alkali solutions, temperature, and pressure.
03｜High Temperatures

Steam Valves and High-Temperature Pipelines

Steam Valves and High-Temperature Pipelines

After operation at high temperatures, the compression force decreases, and the valve seat or gasket loses its sealing force.

First, check: the high-temperature valve seat or gasket, as well as the temperature, pressure, and compression ratio.
04｜Low Temperatures

Cryogenic Gas Valves

Cryogenic Gas Valves

When the equipment is started up, the seal loses its elasticity and begins to leak after being subjected to alternating low temperatures and pressure.

Suitable for: Low-temperature valve seals; compatible with low-temperature, high-pressure, and gas conditions.
05｜Flange

Flanges for Chemical Process Piping

Flanges for Chemical Process Piping

After pressurization, a leak occurred at the flange joint, and repeated retightening failed to resolve the issue.

First, verify the inner and outer diameters, thickness, flange face, and fastening method of the flange gasket.
06｜Semiconductors

Semiconductor Polishing Equipment

Semiconductor Polishing Equipment

Particles generated by the wear of the grinding rings affect both cleanliness and yield.

Capable of processing: low-particle, wear-resistant grinding rings; verify dimensional stability, cleanliness, and antistatic properties.
07｜Food

Food Equipment Cleaning Lines

Food Equipment Cleaning Lines

After repeated exposure to hot water and cleaning agents, the seal became deformed and began to leak again after cleaning.

Acceptable: Gaskets or O-rings that meet food contact requirements; check the cleaning temperature and medium.
08｜Rotation

High-Speed Rotating Shaft Equipment

High-Speed Rotating Shaft Equipment

When the oil seal wears out, oil leaks from the shaft surface, and the higher the rotational speed, the sooner the equipment enters the maintenance cycle.

First, check the following: the rotary shaft oil seal, shaft diameter, rotational speed, friction, and installation clearance.