Acetal Copolymer vs Dupont Delrin® Homopolymer: Properties and Benefits of Each
Industrial Plastic Supply, Inc. has been supplying a vast inventory of plastics to a wide customer base since 1975. Today, we put the spotlight on two products that are incredibly similar, but have key differences that result in each performing optimally in certain applications: the Acetal Copolymer and the Delrin® Homopolymer.
Both of these acetal materials are incredibly similar, with similar beneficial properties. They are both compliant with FDA, ITAR, and RoHS standards. Both are very stiff plastics with excellent dimensional stability in average environments. They are self-lubricating, easy to cut with standard tools, and abrasion and wear resistant. The major differences between them however are a result of their differing structures.
What Is Polyoxymethylene
Polyoxymethylene (also known as POM for short) is an important and commonly used engineering plastic material. There are two distinct types of POM; the first is Homopolymer Acetal and is commonly called Dupont Delrin®. The other is Copolymer Acetal and is referred to by the trade names Celcon®, Sustarin® C, Tecaform®, Ultraform®, Kepital® and many others. Both versions of POM are very popular thermoplastic materials. They both are commonly used for parts that need to be stiff, dimensionally stable and have low surface friction.
The homopolymer possesses much more regularity in its structure, with a repeated, crystalline pattern throughout the plastic. As a result of its strong, crystalline makeup, the Delrin® Homopolymer has superior physical properties, such as better fatigue and creep resistance, and bearing properties. Also, it has better short-term heat resistance compared to the acetal copolymer, with a much higher melting point.
However, this homopolymer does experience minor and inherent center-line porosity. This is basically a band area of tiny porous holes along the center of a rod or sheet. Depending on the severity of the porosity, these holes could weaken a finished part or cause other problems with its performance.
We’ve found that our customers tend to gravitate towards the acetal copolymer when they require a wider processing window, lower costs, and better long-term resistance to heat and alkaline environments. The acetal copolymer is not as crystalline in its structure, which causes it to not only have a generally lower melting point, but when incorporated with other materials, also increases the tolerance for high melting temperatures.
The less crystalline structure of the copolymer means that this plastic isn’t quite as strong. However, its mixed molecular structure has several benefits. The acetal copolymer has improved resistance to oxidation, improved chemical resistance, and much better long-term resistance to heat. That difference in chemical resistance is much more pronounced with exposure to hot water, especially chlorinated water. The acetal copolymer survives much longer than the homopolymer in these conditions.
Both the Acetal Copolymer and the Delrin® Homopolymer have their benefits. Depending on your application and requirements, you can choose the best acetal based plastic for your needs. In need of a supplier of plastics and plastic materials? Check out the rest of Industrial Plastic Supply today!
High Standards And Procurement From Reliable U.S. Manufacturers
Industrial Plastic Supply Inc. is ISO-9001:2015 certified. This benefits our customers since this certification communicates that we take quality and consistency seriously. We distinguish ourselves by providing Acetal Copolymer rods and sheets of exceptional quality over and over again so customers don’t have to wonder what they are getting when they do business with us.
American sourcing is another point of pride. In a time of global trade, a distributor may choose to do business with suppliers outside the U.S.. However, we believe that American quality and standards are top of the line. As such, our Acetal Copolymer is sourced from U.S. manufacturers. Our business partners – customers and vendors alike – can take pride knowing that their investments and dealings with Industrial Plastic Supply benefits U.S. customers, employees, and communities.
U.S. Sourcing Advantage
The benefit to customers in sourcing plastic from U.S. producers is more than patriotic or sentimental. Fact is, supply chains are more delicate than many of us imagine. Whether due to natural disasters, materials shortages, or politics, supply chains can fray and even snap. When that happens, price predictability and long-term supply/shipping agreements are thrown into disarray. Customers don’t want to hear excuses and “maybes” after they have signed contracts, paid money, and anticipate Acetal Copolymer products.
We pride ourselves on stocking and providing quality North American made Acetal Copolymer produced under the trade names: Tecaform® AH, Sustarin® C and ZL® 900. Each of these quality brand names are widely known for exceptional quality, consistency and durability.
Why Acetal Copolymer Is A Good Investment
Acetal Copolymer Performance Plastic
Acetal Copolymer is FDA compliant, opening up its use for food processing and packaging. The material is also stiff, resilient, and abrasion-resistant to a very high degree. Industrial Plastic Supply provides Acetal Copolymer materials in natural (white), black, and blue. Its stiffness and ability to hold shape under harsh conditions means that Acetal Copolymer sheets and rods can be shaped with standard cutting tools. This quality Copolymer Acetal material is FDA and NSF approved.
There are several special grades of Acetal that are formulated for tough food processing applications. Acetal Copolymer is available in a food grade blue for optical detection during food processing. This eliminates broken parts from getting into finished food products. There are also ultra detectable grades that are visual, x-ray and metal detectable for high end food processing applications. Contact us for more information on these special materials.
Automotive, Aerospace, and Medical Use
This plastic has exceptional ability to hold shape under stress, making it an excellent product in automotive and aerospace hardware. Gears, rollers, fuel lines, pumps and medical equipment all make use of Acetal Copolymer. However, care must be taken that the Acetal Copolymer is not exposed to temperatures above roughly 230 Fahrenheit (110 Celsius).
There are several factors to keep in mind when handling Acetal Copolymer:
Upon intense heating, Acetal Copolymer releases formaldehyde and carbon monoxide.
If machining or grinding, small Acetal Copolymer dust particles pose an inhalation and explosion hazard.
Prolonged exposure to UV light degrades Acetal Copolymer exposed surfaces and may change physical resilience.
Therefore, proper procedures must be taken when handling and machining this material. This is something Industrial Plastic Supply Inc. takes very seriously, not just for compliance reasons but also for the health and well being of our employees, customers, and ultimately the end-users.
Contact Industrial Plastic Supply for Acetal Copolymer
Industrial Plastic Supply Inc. is proud to be a distributor of Acetal Copolymer and other polymers. Contact us today for a quote and details about products, delivery, prices, and more. Call us @ 866-832-9315