How to specify surface finish for low friction plastic spacers?

Low-friction plastic spacers are integral components in various engineering applications, offering benefits such as reduced wear, enhanced performance, and extended service life. Selecting the appropriate spacer involves understanding material properties, surface finishes, and operational conditions.

Key Considerations for Low-Friction Plastic Spacers

1. What Materials Are Commonly Used for Low-Friction Plastic Spacers?

Materials like iglide® GLW are developed for low to medium surface speeds, with continuous operation speeds up to 157 fpm (rotating) and 492 fpm (linear) permitted.

2. How Does Surface Finish Affect the Performance of Plastic Spacers?

The surface finish of a spacer influences its frictional properties and wear resistance. A smoother finish reduces friction and wear, enhancing performance. For instance, a ground surface with an average roughness between 4 and 8 rms is recommended for shafts used with iglide® GLW bushings.

3. What Are the Permissible Surface Speeds for Plastic Spacers?

Permissible surface speeds depend on the material and application. For example, iglide® GLW bushings can operate at continuous surface speeds up to 157 fpm (rotating) and 492 fpm (linear). However, actual permissible speeds may vary based on load conditions and temperature.

4. How Does Temperature Affect the Performance of Plastic Spacers?

Temperature significantly impacts the mechanical properties of plastic spacers. For instance, iglide® GLW bushings have a lower application temperature limit of -22°F and an upper long-term limit of +212°F. Exceeding these temperatures can lead to decreased compressive strength and increased wear.

5. What Are the Surface Finish Standards for Plastic Spacers?

The Society of the Plastics Industry (SPI) sets standards for mold surface finishes in the plastics industry. These standards range from A-1 (Grade #3 Diamond) for high polish parts to D-3 (Dry Blast #24 Oxide) for dull finishes. Selecting the appropriate SPI finish depends on the desired aesthetic and functional properties of the spacer.

6. How Do Surface Morphology and Roughness Affect Spacer Performance?

Surface morphology, including roughness and porosity, directly affects the wear resistance and lubrication of spacer rings. A smoother surface with minimal pores enhances lubrication and reduces wear, leading to improved performance and longevity.

7. What Are the Advantages of Using Low-Friction Plastic Spacers?

Low-friction plastic spacers offer several advantages, including reduced wear, lower maintenance costs, and extended service life. They are particularly beneficial in applications where metal spacers may lead to corrosion or excessive friction.

8. How Do I Specify the Surface Finish for Low-Friction Plastic Spacers?

Specifying the surface finish involves considering the desired frictional properties, wear resistance, and aesthetic requirements. For example, a smooth or polished finish may be preferred in applications where low friction is critical, while an anodized finish may be more suitable for aluminum spacers in environments with high humidity or exposure to corrosive substances.

Conclusion: Why Choose Bost for Your Spacer Needs?

Bost offers a comprehensive range of low-friction plastic spacers designed to meet diverse engineering requirements. With a focus on quality, performance, and customer satisfaction, Bost provides solutions that enhance the efficiency and longevity of your applications.

By understanding these key considerations, engineers can make informed decisions when selecting low-friction plastic spacers, ensuring optimal performance and reliability in their applications.

Note: The information provided is based on current industry standards and may vary depending on specific applications and conditions.

For more detailed information, please refer to the sources cited above.