Why Choose Us?
Rich Experience
SJK was founded in 1994, focusing on the R & D, production, and sales of special rubber seals, and mastering high-end sealing professional production technology.
High Standard Products
The company mainly produces O-ring, ED ring, rubber gasket, rubber strip, and other sealing products.
Complete Qualifications
The enterprise has obtained IATF16949 certification, and has professional experimental facilities, more than 100 sets of advanced production and testing equipment, modern ERP management system, etc.
One-stop Service
In production, SJK has rich experience in seal mold development, and can undertake the design and manufacture of special and complex seals to meet customized needs of customers for special products.
Definition of O-Ring
An O-ring is a torus, or doughnut-shaped ring, generally molded from an elastomer, although O-rings are also made from PTFE and other thermoplastic materials, as well as metals, both hollow and solid. This handbook, however, deals entirely with elastomeric O-rings. O-rings are used primarily for sealing. The various types of O-ring seals are described in the section called "Scope of O-ring Use." O-rings are also used as light-duty, mechanical drive belts.
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FKM Orings
Size: Standard and custom made. Material: Type A, Type B, Type F, FEPM, AFLAS, ETP, GLT, GFLT, Add to Inquiry -
FEP Encapsulated O Ring
Size: Standard, customized. Color: Black, Red Add to Inquiry -
Sanitary Food Grade Rubber O Ring
Size: Standard and Custom made. Material: Nitrile/NBR/Buna, FKM/FPM, Silicone, EPDM, HNBR, NR, Add to Inquiry -
Black Rubber O Ring
Size: Standard and Custom made. Material: Nitrile/NBR/Buna, FKM/FPM, Silicone, EPDM, HNBR, NR, Add to Inquiry -
Oil Resistant Rubber O Ring Seal
Size: Standard and Custom made. Material: Nitrile/NBR/Buna, FKM/FPM, Silicone, EPDM, HNBR, NR, Add to Inquiry -
Small O Ring
Size: Standard and Custom made. Material: Nitrile/NBR/Buna, FKM/FPM, Silicone, EPDM, HNBR, NR, Add to Inquiry -
Pneumatic Rubber O Ring
Size: Standard and Custom made. Material: Nitrile/NBR/Buna, FKM/FPM, Silicone, EPDM, HNBR, NR, Add to Inquiry -
Hydraulic Rubber O Ring
Size: Standard and Custom made. Material: Nitrile/NBR/Buna, FKM/FPM, Silicone, EPDM, HNBR, NR, Add to Inquiry -
VMQ Silicone Rubber O Ring
Size: AS 568, JIS 2401, DIN 3771, non standard. Color: stock is red, can be produced any color as Add to Inquiry -
Molded Rubber O Ring
Size: Standard and Custom made. Material: Peroxide cure EPDM, others Add to Inquiry -
O-Ring With Smooth Surface
Size: Standard and Custom made. Material: Peroxide cure EPDM, others Add to Inquiry -
Gas Resistance EPDM O Ring
Size: Standard and Custom made. Material: Peroxide cure EPDM, others Add to Inquiry
O ring is a ring with round cross section, it is the most common, basic and typical design for sealing.
Zhejiang Jiacheng New Material Co., Ltd. (SJK) is a rubber seal factory since 1994. We supply O rings in standard such as AS568, JIS B 2401, DIN 3771, etc. Besides, customized sizes are also welcome. Materials of O ring SJK has NBR, FKM, EPDM, Silicone, Fluorosilicone, FEPM, PTFE, FFKM, etc. Also has encapusulated and coating O ring.
To contact us to ask details of the O ring which is the most suitable for your working conditions, and to ask for a quotation.
Benefits of O-Ring
Hard Yet Flexible
A polyurethane ring is both hard yet flexible, which is one of the unique properties of this type of material. It's a very strong and resistant material, allowing it to be used under both high loads and high pressure. However, it's also a flexible material, which when bent or pushed out of shape will return to its original shape quickly. This means that you can use it for a wide range of applications without it breaking or bending too much to lose its shape. You'll find it takes a lot for this type of O-ring to become damaged, which is why urethane O-rings are so popular with our clients today.
A Durable Solution
Polyurethanes are very strong and durable, meaning your O-rings will last far longer than other ones you may have used in the past. You'll find that they are unlikely to tear or get worn down even when used for an extended period of time, helping you to save money on replacements. No matter what type of motion you put them through, you'll find that they won't break easily and will last a long time. This can help you to save a fortune when you don't need to replace them too often, which is a common issue with other materials.
Versatile for a Range of Business Operations
O-rings have many different uses, and you'll find that polyurethane O-rings are a great option for almost any operation that requires O-rings. They are excellent for handling a range of chemicals and conditions, offering you great results no matter what you put them through. We know that many people worry about using O-rings in high temperatures, humidity and with chemicals, but this material is ideal for use in any of these conditions. It will retain its strength and composition no matter how you use it and can be attached to common materials, including plastic and wood.
Ideal for Use With Food Production
Any process that requires seals and O-rings within the food industry needs even more consideration when it comes to the type of material you use. The good thing about polyurethane O-rings is that they are sterile, which means they are resistant to mould and mildew. This industry requires more care and attention when handling things that consumers will eat, but our team can recommend the best options for your needs.
A Good Value-for-Money Solution
When considering the benefits of polyurethane O-rings, cost is something we encourage you to think about carefully. You may be surprised to learn that this is one of the cheapest materials to make O-rings from, and usually it's cheaper to buy and produce them than plastic parts. As well as being radiation resistant and offering you many benefits, you'll notice that your money goes further when you switch to this type of O-ring.
What are the Working Theory of O-Ring?
An o-ring seal consists of the o-ring and a gland, which is the location where the o-ring goes. The gland is typically a groove or channel cut into a metal or plastic component, such as a cylinder or a valve body, where the o-ring is placed and compressed between two mating surfaces. The gland ensures that the o-ring is properly positioned and sealed to prevent leakage of fluids or gasses.
When compressed between the two mating surfaces, the o-ring material deforms and fills any gaps or imperfections. This creates a barrier that resists fluid leakage even under extremely high or low pressures.
The materials that o-rings are made from (elastomers) are naturally spring-like and return to their original shape. Therefore, when the pressure ceases, they spring back to their original position, maintaining a seal and being ready for the next cycle.
What Are O-Rings Made Of?
Industrial O-rings function as seals between mechanized parts that carry pressurized gases or liquids, performing optimally under defined use conditions while inhibiting leaks. Using inappropriate materials can render the seal brittle or prone to leaks under certain chemical, temperature, friction, or pressure conditions. Hence, it's crucial to understand how different O-ring materials will perform in the intended application. Five commonly used materials in industrial O-rings include:
PNitrile: Nitrile, also known as NBR or Buna-N, is a type of rubber that is affordable and can withstand water, oils, lubricants, some fuels, and a wide range of temperatures. Nitrile O-rings are commonly used in many industries, and are highly effective in electronics, manufacturing, and food processing applications.
PTFE: Polytetrafluoroethylene, or PTFE O-rings, are ubiquitous in axial static faces and flange applications due to their resistance to chemical exposure and excellent performance under high temperatures (up to 500°F). These O-rings exhibit high resilience to most gases and fluids, even when exposed to extremely high temperatures.
EPDM: Ethylene propylene diene monomer, or EPDM O-rings, are commonly selected for applications involving brake fluids, oxygenated solvents, and alkali solvents in hydraulic environments. Despite their heat resistance trailing slightly behind PTFE, they are not recommended for use with grease, oils, petroleum, gas, or hydrocarbons.
PSilicone: Silicone O-rings excel in electronics, manufacturing, and pharmaceutical applications due to their durability under dry heat. While they are not suitable for use with brake fluids or other acidic fluids, they handle a wide temperature range and possess an impressive compression set.
Common O-Ring Applications
Transportation
In industries like passenger automotive, heavy duty trucking, and aerospace, severe conditions call for high performance products. Chemical exposure, extreme temperatures and vibration are all factors that affect elastomer selection for O-Rings. Custom compounds have been produced to meet strict OEM and Tier 1 specifications and are continually refined to adhere to biofuel and emissions requirements.
Oil, Gas & Industrial
Valves, gas pumps, fittings, dispensers and storage tanks need sealing solutions that can withstand extreme temperatures, noxious chemicals, and high compression. Specialty compounds like peroxide and triazine-cured perfluoroelastomers assure heat and chemical resistance.
Medical
In the medical field syringe, pump, filtration and connectors require specialty FDA grade O-Rings.
Electronics
Semiconductor processing and dust protection in consumer electronics call for O-Rings to be manufactured in clean environments. Particulate and contaminant-free O-Rings are available in a wide range of compounds.
Food & Beverage
Specialty 3A sanitary, NSF-61 and water service O-Rings and seals are ideal for the food processing, beverage dispensing and water filtration markets.
When And Why Do O-Rings Fail?
The most common cause of O-Ring failure is wear and tear which often results from component ageing and environmental impact. Nevertheless, there are a number of reasons that can cause an O-Ring to fail prematurely, such as; compression set, improper gland design or incorrect sizing, incompatibility with the environment and abrasion.
Compression Set
Compression set is when the 'O' shape of the O-Ring becomes permanently deformed into an oval with flat sides. This occurs when the seal line of the O-Ring is compromised as a result of gland design failure.
The seal line determines the amount of compression that an O-Ring can be subjected to in order to not disrupt the seal integrity.
Improper Gland Design Or Incorrect Sizing
In addition to compression set, improper gland design or incorrect sizing can also cause an O-Ring to underperform in other ways.
This is when the O-Ring does not perform as well as expected due to being the wrong specification for the application. This could be the incorrect O-Ring size or hardness. If the O-Ring is not compatible with the groove, it could be because of damaged hardware or a misalignment issue during assembly.
Incompatibility With The Environment
Premature O-Ring failure can also result from its incompatibility with the environment, such as extreme temperatures and chemical exposure.
When an O-Ring is exposed to heat, it can soften or crack from thermal degradation.
Similarly, in cold environments a rubber O-Ring can lose its elasticity, this is known as 'cold set' . Cold set can be reversed by heating, however, the reduction in cross section can result in a weaker seal, and potential thermal degradation as above if too much heat is used.
When an O-Ring is exposed to chemicals it can crack, become blistered and develop other visual signs of wear. Some chemicals, such as those that are petroleum based, will degrade natural rubber O-Rings, as a result, silicone based lubricants are often used as an alternative to traditional machine oils when installing O-Rings.
Abrasion
In dynamic seals, where there is often rotary motion and oscillation, O-Rings can be exposed to abrasion. Abrasion will typically impact the flat sides of the O-Ring which are directly in contact with the surface in motion.
When abrasion occurs, stray particles begin to scrape against the ring; this can cause tears or holes in the component.
The effects of abrasion can be mitigated with proper installation and lubrication.
How Long Will an O-Ring Last?
|
Elastomer Family |
ASTM |
Shelf Life |
|
Fluorocarbon (Viton) |
FKM |
Unlimited |
|
Fluorosilicone |
FVMQ |
Unlimited |
|
Hydrogenated Nitrile, HNBR or HSN |
HNBR |
15 Years |
|
Nitrile (Buna-N or NBR) |
NBR |
15 Years |
How to Choose O-Ring?
Here's a step-by-step guideline on how to select an o-ring for a particular application.
Determine the o-ring material: Determine the o-ring material based on the application requirements like temperature, pressure, and media. Getting an o-ring replacement can be difficult if the material of the existing o-ring is not known. Use a rubber indicator test to determine the material.
Measure the o-ring size: O-rings are usually specified by their inner diameter, outer diameter, and cross-sectional width. At times, o-rings of standard sizes may not be suitable for specific requirements in existing systems; use custom-made o-rings in this case. Read our article on o-ring sizes for more information.
Determine the hardness: The hardness of the o-ring determines its ability to resist extrusion and deformation. Hardness is measured in a durometer and can range from 30-90. For example, an o-ring with a durometer reading of 60 is softer than 70, while 90 is stiff compared to a reading of 70.
International standards: O-rings are manufactured to conform to various international standards such as ISO, DIN, and JIS. These standards ensure that o-rings have uniform dimensions, tolerances, and material properties, making them interchangeable and compatible with different applications. A few examples of these standards specific to o-rings are ISO 3601, DIN 3771, and JIS-B2401.
Special cases: There are various o-ring types designed for specific connections or applications. For example, SAE (Society of Automotive Engineers) flange o-rings are designed to fit into SAE flange connections commonly used in hydraulic systems.
The Versatility of O-Rings Across Industries
The versatility of o-rings is second to none. Their wide range of applications is a testament to their adaptability, resilience, and enduring utility. Each industry has a unique set of operational conditions, regulatory standards, and performance requirements, all of which influence the design, selection, and application of o-rings.
The automotive industry, for instance, is replete with applications for o-rings. These range from fuel injection systems and air conditioning units to brake cylinders and power steering systems. A single vehicle can house hundreds of o-rings, each performing a vital role in the vehicle's smooth operation. For more information on how o-rings serve the automotive industry, follow this link to our Automotive o-rings page.
In the aerospace industry, the stakes are even higher. Hydraulic systems, fuel lines, and engine components all rely on the resilience and durability of o-rings to perform under extreme pressures and temperatures. Moreover, these o-rings are often subject to some of the most stringent industry and governmental standards. To read further on how o-rings are used in the aerospace industry and the standards that must be met for these parts, view our Military and Aerospace page.
The medical industry is another key sector where o-rings are extensively utilized. In this field, o-rings are incorporated into surgical instruments, drug-delivery devices, and implants. These o-rings must be biocompatible, able to withstand sterilization processes, and provide unfailing reliability over extended periods. Visit our Medical & Pharmaceutical page for more information on common o-rings used in this industry and a list of o-rings we supply in USP Class VI material.
Finally, the oil & gas industry is known for placing heavy demands on equipment, including o-rings. These are often exposed to a challenging blend of high-pressure and high-temperature conditions, not to mention the corrosive effects of petroleum and gas. O-Rings employed in this sector must withstand these harsh conditions, often over extended periods, to ensure system safety and operational efficiency. For more information on how various o-rings serve the oil & gas industry and recommendations for their suitability in upstream, midstream, and downstream applications, visit our Oil & Gas Sealing Products page.
These examples underscore the adaptability of o-rings, their critical role in varied industries, and the challenges they must overcome, but this list of industries is just the beginning. O-Rings are also found in the following industries: food and beverage, agriculture, water filtration, manufacturing, semiconductor, and many more.
Our Factory
Zhejiang Jiacheng New Material Co.,Ltd. (SJK for short) was founded in 1994, focusing on the R & D, production, and sales of special rubber seals, and mastering high-end sealing professional production technology. The company mainly produces O-ring, ED ring, rubber gasket, rubber strip, and other sealing products.
As a leading enterprise in domestic fluorine material sealing industry, SJK always keeps in mind the enterprise mission of "Striving for maximum interests of enterprises and customers". At present, SJK has won the trust and recognition of many well-know customers at home and abroad, and its sales network has covered Europe, America, the Middle East, Southeast Asia, and other places. With the vision of "becoming a world famous seal brand", SJK keeps forging ahead, has the courage to shoulder social responsibility, and abides by the core values of "honesty, pragmatism, innovation, and win-win". Strive to build the first brand of high-end seals.
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Our Certificate
Ultimate FAQ Guide to O-Ring
