Product Content
Category
Engineering Plastic-POM
POM is a thermoplastic crystalline polymer. It is known as 'super steel' or 'steel substitute', and is also referred to as polyoxymethylene. The English abbreviation is POM. Typically, the polymers obtained from methanol polymerization have low polymerization degrees and are prone to thermal decomposition. POM can be used as raw materials for organic chemicals and synthetic resins, as well as fumigants for pharmaceuticals.
POM, with a lower cost compared to many other engineering plastics, is replacing metals like zinc, brass, aluminum, and steel in various applications. Since its introduction, POM has been widely used in fields such as electronics, electrical appliances, machinery, instruments, daily light industry, automobiles, construction materials, agriculture, etc. In new application areas like medical technology and sports equipment, POM also shows good growth potential.
**Advantages:**
1. High mechanical strength and rigidity.
2. Excellent fatigue strength.
3. Good environmental resistance and solvent resistance.
4. Strong resistance to repeated impacts.
5. Wide operating temperature range (-40°C to 120°C).
6. Good electrical properties.
7. Excellent recovery performance.
8. Self-lubricating and wear-resistant.
9. Excellent dimensional stability.
**Mechanical Properties:**
POM has high strength and rigidity, excellent elasticity, and good wear-reducing properties. Its mechanical properties are outstanding, with a specific strength reaching up to 50.5 MPa and specific stiffness reaching up to 2650 MPa, which is very close to metal. The mechanical properties of POM change little with temperature; copolymer POM changes slightly more than homopolymer POM. POM has relatively high impact strength, but it is not as good as ABS and PC under conventional impact conditions. POM is sensitive to notches, and the presence of a notch can reduce impact strength by up to 90%. POM's fatigue strength is particularly prominent, reaching 35 MPa after 10 alternating loads, while PA and PC are only 28 MPa. POM's creep characteristics are similar to PA, and at 20°C, 21 MPa, and 3000 hours, the creep rate is only 2.3%, with minimal influence from temperature. POM has a low friction coefficient and excellent wear resistance (POM > PA66 > PA6 > ABS > HPVC > PS > PC), high limit PV values, and good self-lubrication. Under high load conditions, POM products may produce a screeching sound when rubbed.
**Electrical Properties:**
POM has good electrical insulation properties that are almost unaffected by temperature and humidity. Dielectric constant and dielectric loss remain stable over a wide range of temperatures, humidities, and frequencies. POM has excellent arc resistance and can maintain this property at high temperatures. The dielectric strength of POM depends on thickness, reaching 82.7 kV/mm at 0.127 mm thickness and 23.6 kV/mm at 1.88 mm thickness.
**Environmental Properties:**
POM is not resistant to strong acids and oxidizing agents but has certain stability against alkenes and weak acids. POM has good solvent resistance, can withstand hydrocarbons, alcohols, aldehydes, ethers, gasoline, lubricating oils, and weak bases, and maintains considerable chemical stability even at high temperatures. It has low water absorption and excellent dimensional stability. However, POM has poor weather resistance; prolonged exposure to ultraviolet light causes a decline in mechanical properties, surface powdering, and cracking.
