The Ultimate Buyer's Guide for Purchasing polyurethane sealing ring

Choosing the right O-ring material is crucial for ensuring proper sealing performance in a variety of applications. O-rings come in many materials, each offering different benefits based on factors like chemical resistance, temperature, pressure, and application environment. Here's a guide to help you choose the right O-ring material:

If you are looking for more details, kindly visit our website.

1. Consider the Operating Temperature

- Low Temperature: For cold environments, materials like silicone, nitrile (Buna-N), and fluorosilicone are commonly used. These materials can remain flexible in extremely low temperatures.

- High Temperature: If your application involves high heat, you&#;ll want materials like Viton (FKM) or fluorocarbon, which can withstand temperatures up to 400°F (204°C) or more.

2. Assess Chemical Resistance

- Nitrile (Buna-N): Great for applications involving petroleum-based oils, fuels, and hydraulic fluids.

- Viton (FKM): Resistant to a wide range of chemicals, making it ideal for chemical processing and automotive industries.

- EPDM: Offers excellent resistance to weather, ozone, and water-based chemicals, making it perfect for outdoor or wet environments.

NBR O Ring

3. Understand Pressure and Mechanical Stress

- For high-pressure environments, you need O-rings that are highly resistant to compression and extrusion. Materials like fluorocarbon (Viton) or PTFE are excellent choices for withstanding high pressure.

- In applications with dynamic stress (such as movement or vibration), you might choose more durable materials like polyurethane or HNBR, which provide excellent wear resistance.

4. Evaluate Application Environment

- Outdoor Environments: O-rings exposed to UV rays, ozone, or weather should be made from EPDM, which is highly resistant to environmental factors.

Dingtong are exported all over the world and different industries with quality first. Our belief is to provide our customers with more and better high value-added products. Let's create a better future together.

- Food and Medical Applications: For applications requiring FDA compliance, materials like silicone or fluorosilicone are safe for contact with food, pharmaceuticals, and medical devices.

5. Check for Hardness (Durometer)

- The hardness of O-ring materials is measured by the Shore A durometer scale. Soft O-rings (low durometer) are better for sealing at low pressures, while harder O-rings (high durometer) are more suitable for high-pressure environments.

Custom O Ring

6. Special Considerations

- Fuel Systems: If your application involves fuels or automotive systems, nitrile or Viton are usually the best materials due to their fuel resistance.

- Hydraulic Systems: Nitrile O-rings are often chosen for hydraulic applications as they offer good resistance to oils and wear.

- Extreme Conditions: For extreme chemical or high-temperature environments, materials like Viton or perfluoroelastomer (FFKM) are your best choices.

7. Compatibility with Lubricants and Greases

- If your O-rings will be in contact with oils, greases, or lubricants, check the material compatibility. For example, nitrile is compatible with petroleum-based oils, while silicone and EPDM may degrade when exposed to such substances.

By evaluating these factors, you can choose the best O-ring material for your specific application, ensuring durability and performance.

Why Is A Gasket Required?

No matter how finely two parts are smoothed and how well you bolt them together, at a microscopic level, there will be gaps through which liquids or gases can escape. Where the inner workings of the equipment create heat and/or pressure, the liquid/gas will become more viscous and simultaneously the pressure will force it out from any weak points. This can be catastrophic to a machine running under extreme forces and heat, which therefore requires constant lubrication and heat dissipation, or where the equipment is pumping liquid/gas in a production facility.

Placing a gasket between these parts using a different material effectively &#;fills&#; these microscopic gaps and creates an effective barrier to keep the liquid or gases in.

Want more information on polyurethane sealing ring? Feel free to contact us.