Oil seal products usually undergo the following types of tests before leaving the factory:

31 Jul.,2025

Oil seal products usually undergo the following types of tests before leaving the factory:1.Appearance and size inspection.2.Material performance test.3.Sealing performance test.4.Other performance tests

 

Oil seal products usually undergo the following types of tests before leaving the factory:

An oil seal, also known as a fluid seal or grease seal, is typically a circular component designed to fit snugly around a shaft or within an assembly to encapsulate and retain lubricating oils, greases, or other fluids. They are often made from a combination of materials such as rubber, silicone, and polymers, depending on the application and the fluid being sealed. The design of an oil seal usually features a flexible lip that compresses against the surface of the shaft or housing, creating a tight seal that prevents fluid from leaking out while simultaneously keeping dirt, dust, and other debris from entering the system.

Oil seals come in various sizes and configurations to meet the diverse requirements of different applications. Common forms of oil seals include single-lip seals, double-lip seals, and various specialized designs tailored for specific environments or uses. They are also capable of withstanding a range of temperatures, pressures, and speeds, making them indispensable in numerous settings.

 

Oil seal products usually undergo the following types of tests before leaving the factory:
1.Appearance and size inspection.
2.Material performance test.
3.Sealing performance test.
4.Other performance tests
01
Appearance and size inspection
Appearance inspection: Check that the oil seal should be flat as a whole, the exposed skeleton should be free of rust, the outer rubber should be smooth and firmly bonded, and axial scratches, missing materials, cracks and other problems are not allowed. The sealing lip and dustproof auxiliary lip should be smooth and flat, without impurities, cracks, flash burrs, concave and convex defects, etc., and the rotation direction of the lip must also comply with regulations.
Dimension measurement: Use tools such as a dial vernier caliper and an outside micrometer to detect the exposed metal outer diameter, height, inner and outer diameters of the lip, inner diameter of the auxiliary lip, lip thickness, skeleton thickness and other dimensions of the oil seal, which must meet the design requirements and the dimensional tolerances of relevant standards.
02
Material performance test
Metal parts inspection: Perform material composition analysis on metal parts such as floating seal rings to ensure that the materials meet the requirements. Metallographic analysis is used to detect whether the heat treatment structure is reasonable. The Rockwell hardness test on the metal surface is used to detect whether the hardness meets the standard and whether the depth of the effective hardened layer after quenching meets the regulations.
Rubber parts inspection: Use a Shore durometer to test the Shore hardness of rubber; use a tensile testing machine to measure the tensile properties of rubber; use special testing equipment to measure the resilience of rubber; conduct a hot air aging test on rubber, place the rubber sample in a hot air aging box, and observe the changes in rubber properties at the specified temperature and time.
03
Sealing performance test
Static sealing test: Place the clean floating seal rings in pairs on a level 0 platform. Rubber pads or grease can be added to the bottom, and a counterweight pressure ring is added to the top. Pour an appropriate amount of kerosene. It is required that there should be no leakage or oil seepage on the floating seal ring surface within the specified time.
Dynamic sealing test: Use a dynamic sealing tester to measure the sealing performance, working conditions (such as temperature rise, wear, etc.), service life and optimal value of the installation gap size of the floating oil seal in a standard constant test environment. According to the actual working conditions, the test machine can also be placed in a metal box with simulated ambient temperature and sand, gravel, soil, etc. for testing.
04
Other performance tests
Pressure test: Use a pressure tester to simulate the pressure environment during equipment operation, observe the performance of the oil seal under different pressures, ensure that the oil seal can withstand a certain pressure, and ensure the sealing performance during equipment operation.
High temperature test: Put the oil seal into a high temperature test box to simulate the high temperature environment during equipment operation, and observe the performance of the oil seal in this environment, such as whether deformation, accelerated aging, and decreased sealing performance occur, so as to evaluate its stability at high temperatures.
Friction test: Use a friction tester to simulate the friction state between the oil seal and the shaft, measure the friction force, and ensure that the friction between the oil seal and the shaft is moderate, which can ensure the sealing performance and adapt to the rotation of the shaft.
Appearance and size inspection

Choosing the Right Oil Seal Factory

When looking to purchase oil seals, opting for a reliable factory is paramount. Here’s a comprehensive guide you can follow to ensure you choose the best oil seal manufacturer for your needs:

1. Reputation and Experience: Seek out factories with a strong industry reputation and years of experience in manufacturing oil seals. A well-established company is likely to have a better understanding of market requirements and production challenges.

2. Quality Certifications: Look for factories that adhere to international quality standards, such as ISO 9001. Certifications assure you that the manufacturing processes are closely monitored and meet high-quality benchmarks.

3. Material Selection: Different applications require different materials. Ensure that the factory offers a variety of materials, including nitrile rubber, fluoroelastomer, silicone, and thermoplastics, which can withstand specific temperature ranges, pressures, and chemical exposures.

4. Customization Options: A good oil seal factory should provide customization services, allowing you to specify dimensions, shapes, materials, and performance characteristics tailored to your exact application needs.

5. Advanced Technology and Equipment: Factories that utilize modern technology and advanced machinery typically produce more precise and reliable products. Inquire about their production processes, quality control measures, and the ability to handle tight tolerances.

6. Proven Track Record: Request customer references and case studies to evaluate the factory's performance in meeting client requirements. A factory with a proven track record of successful projects demonstrates reliability and competence.

7. Test and Validation: Look for factories that conduct rigorous testing on their products, including pressure testing, temperature tolerance assessments, and lifecycle testing, ensuring that their oil seals will meet or exceed expectations in real-world applications.

8. After-Sales Support: A reliable manufacturer should provide excellent after-sales support, including warranties, replacement services, and technical assistance. This ensures that you can resolve any issues promptly, maintaining operational efficiency.

9. Competitive Pricing: While quality should not be compromised, it is important to shop around to find competitive pricing. Request quotes from multiple factories to compare costs, but always prioritize quality and reliability over low prices.

10. Sustainability Practices: Consider factories that prioritize eco-friendly practices and sustainable sourcing of materials. This not only supports environmental conservation but can also enhance your brand’s image by aligning with sustainable goals.

Oil seal products usually undergo the following types of tests before leaving the factory: