Britannica
Sources used in this answer
Why are polyacetals used in gears and bearings?
Created from Britannica articles
using AI.
AI can make mistakes, so verify using Britannica articles.
polymer
Industrial polymers are synthesized from simple compounds joined together to form long chains. For example, polyvinyl chloride is an industrial homopolymer synthesized from repeating units of vinyl chloride.
Polyacetal, also known as polyoxymethylene (POM), is widely utilized in the manufacturing of gears and bearings due to its specific mechanical and chemical properties. It is a high-strength, highly crystalline engineering plastic that offers excellent durability in demanding environments.1
Key reasons for its use in these applications include:
- Low Friction: The material exhibits a low coefficient of friction, which is essential for reducing wear and heat generation in moving mechanical parts like gears and bearings.1
- Chemical Resistance: It provides excellent resistance to oils, greases, and solvents, ensuring the components maintain their structural integrity when exposed to lubricants or harsh industrial chemicals.1
- Metal Replacement: Due to its strength and stability, it serves as an effective, lightweight alternative to metal in various automotive and industrial components.1
It is important to note that commercial polyacetal is chemically stabilized—often through end-capping with acetate groups or by forming a copolymer—to prevent the material from decomposing when heated.1