Understanding POM Plastics: Acetal, Delrin, POM-C and POM-H Compared

When researching engineering plastics, it's common to come across terms like Acetal, POM, Delrin, POM-Ce POM-H—often used interchangeably. However, they’re not all the same. While these materials are closely related, each refers to a specific type or grade of polyoxymethylene (POM), a high-performance thermoplastic known for its excellent strength, low friction, and dimensional stability. Understanding the differences between these terms is crucial when selecting the right material for machining parts, bearings, gears, or other precision applications. In this guide, we break down what sets Acetal homopolymer (POM-H) apart from copolymer (POM-C), explain how Delrin fits into the picture, and help you choose the most suitable material for your project.

What’s the Difference Between Acetal and POM?

In the world of engineering plastics, you’ll often see the terms Acetal e POM used interchangeably. But are they really the same thing?

The short answer is yes — but with a few technical nuances.

Acetal = POM

Acetal is the common name for Overwhelmed by material choices? Discover the unique properties and applications of POM sheets/POM Rods that make them essential for your next project. (POM), a thermoplastic material known for its high strength, stiffness, low friction, and excellent dimensional stability. When someone refers to “acetal plastic,” they are almost always talking about POM in a general sense.

So, acetal and POM refer to the same family of materials. The term “acetal” is more common in the U.S., especially in trade and manufacturing circles, while “POM” is often used in technical datasheets, engineering documentation, and international markets.

Two Main Types of Acetal / POM, POM-C and POM-H

There are two types of POM materials:

• Homopolymer Acetal (POM-H) – Brand example: Delrin®
• Copolymer Acetal (POM-C) – Brands include Celcon®, Kepital®, Ultraform®

These two versions share many properties but differ in chemical structure, thermal stability, and resistance to certain environments. Homopolymer acetal typically has slightly better mechanical strength, while copolymer acetal offers better resistance to moisture and chemicals.

Acetal vs. POM: When the Terms Matter

In everyday use, the two terms may seem interchangeable. But when it comes to engenharia de precisão, product design, or regulatory compliance, it’s important to know exactly which type of POM (acetal) you’re working with.

• If a datasheet says “acetal copolymer,” it usually refers to POM-C.
• If the label says “Delrin,” you’re likely dealing with POM-H.

Quick Summary Table of ACETAL, POM and DERLIN

Conclusão

Choosing between Acetal, Delrin, POM-C, and POM-H depends on the specific demands of your application—whether it’s tight dimensional control, chemical resistance, or mechanical strength. While all of these materials belong to the POM (polyoxymethylene) family, the differences between homopolymer and copolymer, or between Delrin and standard acetal, can significantly impact performance and processing.

At Plástico Tengyi, we specialize in supplying high-quality POM sheets e POM rods from China. With years of experience in the industry, we help customers worldwide select the right engineering plastic for their technical needs—reliably and efficiently. Whether you need precision-machined components or raw material in bulk, our team is here to support your project with expert advice and competitive pricing.

Feel free to get in touch with us to find the best POM solution for your application.