Comparison between Metal O-Rings and Non-Metal O-Rings

Metal O-rings and non-metal O-rings (usually rubber O-rings or plastic O-rings) have their own advantages and disadvantages and are suitable for different applications. The following is a comparison of them in many aspects:

1. Material properties

Metal O-rings:

Generally made of metal materials such as stainless steel, aluminum alloy, titanium alloy, etc.

High temperature resistance and corrosion resistance, suitable for extreme environments.

Relatively hard and poor elasticity, but still has good sealing performance in high-pressure applications.

Non-metal O-rings:

Usually made of rubber (such as NBR, Viton) or plastic (such as PTFE).

Good elasticity, suitable for low to medium pressure environments.

The ability to resist heat, oil and chemical corrosion varies depending on the material.

2. Sealing performance

Metal O-rings:

Can maintain reliable sealing under high pressure and high temperature environment, suitable for hydraulic and pneumatic systems.

Suitable for occasions that require repeated disassembly and installation, and not easy to deform.

Non-metal O-rings:

Provide excellent sealing performance for low temperature and low pressure environment, and can adapt to small unevenness of the sealing surface.

Good elasticity, can fill small gaps, and has a good sealing effect.

3. Durability

Metal O-rings:

More wear-resistant and durable, suitable for use in harsh industrial environments.

Generally long life and not easy to age.

Non-metal O-rings:

May age, harden or crack over time due to the influence of temperature and chemicals.

Need to be replaced regularly to ensure sealing performance.

4. Cost

Metal O-rings:

Relatively high cost, but can reduce the frequency of maintenance and replacement in special applications.

Suitable for long-term use.

Non-metal O-rings:

Low cost, suitable for large-scale production and frequent replacement.

More economical, but the frequency of replacement needs to be considered.

5. Installation and maintenance

Metal O-rings:

Care should be taken to prevent scratches and deformation during installation, and special tools may be required.

Maintenance is relatively simple and suitable for long-term use.

Non-metal O-rings:

Installation is relatively simple and can be installed directly by hand.

Need to check and replace regularly to maintain the sealing effect.

6. Applications

Metal O-rings:

Commonly used in high-demand industrial applications such as aerospace, petrochemicals, and hydraulic equipment.

Suitable for high temperature, high pressure, strong corrosion and other specific conditions.

Non-metal O-rings:

Widely used in home appliances, automobiles, mechanical equipment and other fields, suitable for general industry and ordinary consumer goods.

More suitable for applications with lower sealing requirements.

Summary

Metal O-rings and non-metal O-rings each have their own unique advantages and scope of application. The choice of which type of O-ring should be determined based on the specific use environment, operating temperature, pressure, medium type and budget. Metal O-rings are usually more reliable in high temperature, high pressure and special environments; while for general sealing applications, non-metal O-rings are more economical and convenient.

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