PVC vs. Pom

Attribute	PVC	Pom
Chemical Name	Polyvinyl Chloride	Polyoxymethylene
Common Name	PVC	Pom
Structure	Linear	Linear
Use	Commonly used in construction, healthcare, and automotive industries	Commonly used in automotive and consumer goods industries
Properties	Flexible, durable, resistant to chemicals	High strength, stiffness, and hardness

Introduction

When it comes to choosing the right material for a specific application, engineers and designers often find themselves comparing various options to determine which one best suits their needs. Two commonly used materials in the manufacturing industry are PVC (Polyvinyl Chloride) and POM (Polyoxymethylene), also known as acetal. Both materials have unique properties that make them suitable for different applications. In this article, we will compare the attributes of PVC and POM to help you make an informed decision.

Chemical Composition

PVC is a synthetic plastic polymer made from vinyl chloride monomers. It is a thermoplastic material that can be easily molded and shaped when heated. PVC is known for its durability, chemical resistance, and low cost, making it a popular choice for a wide range of applications, including construction, healthcare, and automotive industries. On the other hand, POM is a high-performance engineering plastic that is also a thermoplastic material. It is made from formaldehyde and has excellent mechanical properties, such as high strength, stiffness, and dimensional stability.

Mechanical Properties

When it comes to mechanical properties, PVC and POM have distinct differences. PVC is known for its flexibility and impact resistance, making it ideal for applications that require a material that can withstand bending and stretching without breaking. However, PVC has lower tensile strength and hardness compared to POM. On the other hand, POM is known for its high tensile strength, stiffness, and excellent wear resistance. It is often used in applications where high mechanical strength and dimensional stability are required.

Chemical Resistance

Both PVC and POM have good chemical resistance, but they are resistant to different types of chemicals. PVC is resistant to acids, alkalis, and some solvents, making it suitable for applications where exposure to these chemicals is a concern. However, PVC is not recommended for use with strong oxidizing agents or aromatic hydrocarbons. On the other hand, POM has excellent resistance to solvents, fuels, and oils, making it a preferred choice for applications in the automotive and aerospace industries where exposure to these chemicals is common.

Temperature Resistance

Temperature resistance is another important factor to consider when choosing between PVC and POM. PVC has a lower melting point compared to POM, making it less suitable for high-temperature applications. PVC can withstand temperatures up to 140°F (60°C) before it starts to soften and deform. On the other hand, POM has a higher melting point and can withstand temperatures up to 320°F (160°C) without losing its mechanical properties. This makes POM a better choice for applications that require high-temperature resistance.

Water Absorption

Another important attribute to consider is water absorption. PVC has a low water absorption rate, making it suitable for applications where exposure to moisture is a concern. PVC is often used in plumbing and water distribution systems where resistance to water is essential. On the other hand, POM has a higher water absorption rate compared to PVC. While POM is still considered to have good dimensional stability in wet environments, it may not be the best choice for applications where exposure to water is a concern.

Cost

Cost is always a significant factor to consider when choosing a material for a specific application. PVC is known for its low cost and wide availability, making it a cost-effective option for many applications. PVC is often used in mass-produced products where cost is a primary concern. On the other hand, POM is more expensive than PVC due to its superior mechanical properties and performance. POM is often used in high-performance applications where cost is not the primary consideration.

Conclusion

In conclusion, both PVC and POM have unique properties that make them suitable for different applications. PVC is known for its flexibility, chemical resistance, and low cost, making it a popular choice for a wide range of industries. On the other hand, POM is known for its high mechanical strength, stiffness, and temperature resistance, making it ideal for high-performance applications. When choosing between PVC and POM, it is essential to consider the specific requirements of your application to determine which material is the best fit.