PTFE O Rings & Backup Rings | DCW

O-Ring & Back-up Ring

PTFE O Ring is mainly used for static sealing application in pipes, cylinders, bushings, stems, flanges and connections. Where chemical and physical inertia, as well as resistance to friction, temperature and ageing,  are particularly strategic.

Backup rings are not seals themselves, but are used in conjunction with O-rings or other seals in high-pressure applications. Backup rings are installed in the downstream side of the gland, however, can be installed either side of the O-ring to give a high-performance double-acting seal.

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Why Order from Us?

For over one decade, Dechengwang has been a leader in servicing and supplying our customers with only the best quality O-Rings and machined plastics all at competitive pricing. With so many applications across so many industries, it’s easy to see why manufacturers turn to PTFE or compounding O-rings when they seek a quality sealing solution. You can find our O-rings perform well in such industries as:

  • Food and beverage
  • Mechanical Engineering
  • Automotive
  • Electronics & Semiconductors
  • Aerospace
  • Oil & Gas

Designed for Your Application

  • Low friction coefficient
  • Functions at temperature extremes
  • Excellent moisture resistance
  • Good cryogenic capabilities
  • Good tensile strength

Samples of Our Work, RoHS & FDA Compliant

PTFE back-up-rings

PTFE back up rings

PTFE Guide Ring

PTFE Guide Ring



PTFE piston rings

PTFE Piston Rings



PTFE Rings

PTFE Rings

PTFE V ring

PTFE v ring

O-Ring & Back-up Ring Materials Selections

Material Name Compound % Main Properties Color
PTFE / Very low coefficient of friction and excellent chemical resistance.

FDA approved.

Glass Filled PTFE Up to 40% Improved ware resistance, compression strength, creep resistance, chemical resistance. Good performance in oxidising environment, good creep resistance. White cream
Carbon Filled PTFE Up to 35% Improved electrical and termal conductivity, resistance to load, low coefficient of friction in dry, water, steam applications, chemical resistance. Superior ware resistance increase and low friction properties. Black
Graphite Filled PTFE Up to 25% Improve wear resistance, decrease friction and increase sliding properties against soft metals- chemical inertness. Improve the temperature resistance in some way. Black
Bronze Filled PTFE Up to 60% Improved compression strength, wear resistant, high thermal conductivity, resistance to abrasion. Reduced chemical resistance. Dark Brown
Molybdenum disulphide(MoS2) Filled PTFE up to 5% Increased PTFE properties of hardness and wear resistance. Increased sliding properties and decrease friction. Blue azure
PEEK Filled PTFE Up to 20% Increased thermal resistance, sliding properties, surface hardness. Superior properties on dynamic applications. Light Brown
PEEK / Excellent mechanical properties including strength, rigidity, impact resistance, low wear rate and low coefficient of friction, retained over a wide range of service temperatures. Light Brown
PEEK compound / Improves technical and chemical properties like deformation under load, wear resistance, thermal expansion and electrical conductivity. /
PVDF / Resistant to UV radiation and offers high mechanical strength and abrasion resistance. Beige
PCTFE / Better mechanical properties than other fluoropolymers, low permeability. Translucent
PFA / Excellent chemical and temperature resistance, electrical insulation and excellent processability Natural

Industrial Customization


Custom Performance & Design

In house material compound capability and rich experience in PTFE filed can full fill your needs on o rings and backup rings.


Small or Large Order

We offer on-demand manufacturing according to your actual order volume, No business too small.


Custom Machining

We'll review your volume & design, to determine a most cost-effective approach to your PTFE o ring and backup ring prodcution from our in house compression molding and PTFE machining.

Your Trusted PTFE Rings Manufacturer

Wide Material Selection

You can choose from an array of materials including PTFE, PEEK, PFA, PVDF, and PCTFE so that you can get exactly what you want. 

Free Samples

You can also request free PTFE ring samples to ensure that you are working with the top source in the market and receiving high-quality components.

Excellent Custom Service

We give amazing customer service with customized materials for high reliability and quality as one of the top PTFE ring manufacturers.

Serve For Different Industries

As a competent machined parts supplier, we have extensive experience working with clients in various industries and can manage the varying requirements of various enterprises.

Quality Management

In order to give you the finest service possible, our quality management team ensures that both the raw materials and the completed goods, such as PTFE rings, are of the highest quality.

Molding & Machining Techniques

Because of the high demands of chemical, mechanical, and thermal applications, our PTFE O rings and back-up rings are manufactured utilizing precise machining techniques and, in particular, semi-finished material.

Dechengwang O Ring & Backup Ring

PTFE Teflon™ O Rings

O-rings are one of the most common seals used in machine design because they are inexpensive, easy to make, reliable and have simple mounting requirements. They have been tested to seal up to 5,000 psi (34 MPa) of pressure. The maximum recommended pressure of an O-ring seal depends on the seal hardness and gland clearance.

While rubber or elastomeric compounds are the most prevalent O-Ring materials, certain operating conditions and hardware combinations warrant the usage of PTFE as the material.

PTFE has numerous advantages over elastomers. These benefits include naming a few, corrosion resistance, a wide temperature range, good electrical characteristics, and almost infinite shelf life.


PTFE O-Ring Temperature Range

Standard Low Temp: -200°C (-328°F)

Standard High Temp: 250°C (482°F)

PTFE back-up-rings

PTFE Back-up Ring

Backup rings can be utilized in any application, however, they are most commonly used when higher pressures or pressure spikes, higher temperatures, and/or bigger extrusion gaps are present.


Backup rings are not seals in and of themselves, but rather work in tandem with O-rings or other seals in high-pressure situations. 


Backup rings are often positioned on the gland’s downstream side, although they can be installed on either side of the O-ring to provide a high-performance double-acting seal.

PTFE Back-up Rings Advantages & Application

When used for relevant purposes under appropriate conditions, industrial PTFE backup rings provide various applicable benefits. PTFE backup rings are built in such a way that they can be used to prevent extrusion in rubber sealing systems.

O-rings are used in hydraulic and pneumatic systems to provide excellent sealing solutions in dynamic and static applications. However, when subjected to high temperatures and pressures, O-rings extrude into the clearance between mating surfaces. 

Elevation in ambient pressure or temperature places a significant strain on the physical and chemical qualities of the rubber O-rings, causing the rings to extrude farther and eventually fail and leak.


PTFE V-rings are primarily utilized for sealing on hydraulic cylinder plungers and piston rods, presses, valve spindles, and controllers. Good sealing performance is ensured by the numerous sealing lips and the extensive contact surfaces. 


The seal sets are made up of a pressure ring, a backup ring, and V-rings that are sized and designed to fit the varied operational situations. As a result, they are less susceptible to contaminants from the working medium than one-piece seals.


Along with PTFE, PEEK V-ring are also a good choice. With us, you can choose from a wide variety of materials as per your requirements. 


Our facility houses a multitude of cutting-edge machines, allowing us to complete your PTFE and compounding projects on time and on budget.

PTFE V ring