Sofia Martinez
Acetal, also known as polyoxymethylene (POM), polyacetal, and polyformaldehyde, is a high-strength, low-friction engineering plastic. Acetal is a semi-crystalline thermoplastic based on the formaldehyde molecule. It is commonly used as an alternative to metals in various applications, including mechanical gears, electrical components, automotive products, sports equipment, and medical products. Acetal plastic is available in both homopolymer and copolymer forms, with the homopolymer having superior room temperature strength, stiffness, and toughness, while the copolymer exhibits excellent performance in continuous high-heat and hot water environments.
| Characteristics | Values |
|---|---|
| Other names | Polyoxymethylene (POM), Polyacetal, Polyformaldehyde, Polyethylene glycol, Polyoxymethylene glycol |
| Composition | Formaldehyde molecule |
| Polymer structure | Carbon functional groups bonded to two -OR groups |
| Type | Semi-crystalline thermoplastic |
| Strength | High |
| Friction | Low |
| Wear properties | Excellent |
| Chemical resistance | Resistant to hydrocarbons, solvents, and neutral chemicals |
| Machinability | Easy to machine |
| Applications | Mechanical gears, electrical components, automotive products, sports equipment, medical products, food equipment, hardware, construction tools |
| Operating temperature range | -40°F to 180°F (-40°C to 82°C) |
| Grades | Homopolymer (POM-H), Copolymer (POM-C) |
| Homopolymer characteristics | Superior room temperature strength, stiffness, toughness, higher centerline porosity |
| Copolymer characteristics | Excellent performance in continuous high heat and hot water environments, less porosity |
| Brands | Delrin, Kocetal, Ultraform, Celcon, Ramtal, Duracon, Kepital, Polypenco, Tenac, Hostaform, Acetron |
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What You'll Learn
Acetal plastic is a semi-crystalline thermoplastic
Acetal, also known as polyoxymethylene (POM), polyacetal, and polyformaldehyde, is a semi-crystalline thermoplastic. It is a high-strength, low-friction engineering plastic with excellent wear properties in both wet and dry environments. Acetal is chemically resistant to hydrocarbons, solvents, and neutral chemicals. It is also easy to machine, making it an excellent choice for applications requiring complex, tight tolerances. Acetal plastic is commonly used as an alternative to metals in various industries, including mechanical gears, electrical components, automotive products, sports equipment, medical products, food equipment, hardware, and construction tools.
The formation of acetal plastics involves distilling hydrocarbon chains into smaller parts and then polymerizing them using catalysts. The method of formulation depends on the type of acetal plastic and is generally categorized into homopolymer acetal and copolymer acetal processes. Homopolymer acetal, or Delrin, offers greater stiffness, slightly better tensile and impact strength, and a lower coefficient of friction. However, it is not used in the food industry due to its centerline porosity, which can allow liquid and gas leakages and bacterial growth under certain conditions.
On the other hand, copolymer acetal exhibits excellent performance in continuous high-heat and hot water environments and tends to have less porosity than homopolymer acetal. It is the preferred acetal type for food contact or medical applications. Food-grade acetal is FDA-compliant, optically detectable blue material with good mechanical and wear properties, low moisture absorption, and ease of machining to tight tolerances.
Acetal plastic comes in various blends and formulations, making it versatile and interchangeable with other plastics depending on the specific requirements of a project. Its mechanical properties, such as high stiffness, low friction, and dimensional stability, make it a desirable material across industries. Overall, acetal plastic's unique characteristics and ease of customization contribute to its widespread use in numerous applications.
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It is also known as polyacetal and polyoxymethylene (POM)
Acetal, also known as polyacetal and polyoxymethylene (POM), is a semi-crystalline thermoplastic. It is a general-purpose plastic with excellent engineering properties. Acetal is commonly used for parts that require stiffness, low surface friction, and good dimensional stability.
The dimensional stability of acetal means it can maintain its original dimensions when exposed to changes in temperature and humidity. This makes acetal a desirable alternative to metals across industries. Acetal is used in the production of mechanical gears, electrical components, automotive products, sports equipment, medical products, food equipment, hardware, and construction tools.
Acetal is also known as polyoxymethylene because it is based on the formaldehyde molecule. The formation of acetal plastics involves distilling hydrocarbon chains into smaller parts and then polymerizing them using catalysts. The polymerization of formaldehyde is achieved by anionic catalysis, and the resulting polymer is stabilized by reaction with acetic anhydride.
Acetal is available in both homopolymer and copolymer forms. The homopolymer acetal (POM-H), also known by the brand name Delrin, has superior room temperature strength, stiffness, and toughness. It is, however, not suitable for the food industry due to its centreline porosity, which allows liquid and gas leakages and can enable bacterial growth under certain conditions. The copolymer acetal (POM-C), on the other hand, offers improved chemical resistance and lower moisture absorption. It is preferred for food contact and medical applications due to its non-porous centre.
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It is used as an alternative to metals
Acetal, also known as polyoxymethylene (POM), polyacetal, and polyformaldehyde, is a type of plastic with a range of desirable properties. It is a semi-crystalline thermoplastic that is based on the formaldehyde molecule. Acetal plastic is used as an alternative to metals across various industries due to its excellent dimensional stability, machining profile, and other properties that rival those of metals.
Acetal plastic's ability to serve as a substitute for metals can be attributed to its high strength, low friction, and excellent wear properties. It offers high stiffness and rigidity, even at temperatures as low as -40°C. Acetal plastic is also chemically resistant to hydrocarbons, solvents, and neutral chemicals. Furthermore, its low coefficient of friction and excellent dimensional stability make it ideal for applications requiring precise, tight tolerances.
The versatility of acetal plastic is evident in its wide range of applications. It is commonly used in mechanical gears, electrical components, automotive products, sports equipment, medical products, food equipment, hardware, and construction tools. Acetal plastic's ability to replace metal components has made it a desirable material across industries.
One notable brand of acetal plastic is Delrin, which is a specific type of acetal homopolymer developed by DuPont. Delrin offers superior room temperature strength, stiffness, and toughness compared to other acetal plastics. However, it is important to note that Delrin has increased centerline porosity, which can be a disadvantage in certain applications, especially in the food and medical industries.
In summary, acetal plastic is a versatile and durable material that offers a range of advantages over metals in various applications. Its combination of high strength, low friction, and excellent wear properties makes it a preferred choice in many industries, contributing to its popularity as an alternative to metals.
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It has a variety of blends and formulations
Acetal, also known as polyoxymethylene (POM), is a plastic with a variety of blends and formulations. It is a semi-crystalline thermoplastic that is based on the formaldehyde molecule. Acetal plastic is commonly used as an alternative to metals and is used in a wide range of applications, including mechanical gears, electrical components, automotive products, sports equipment, medical products, food equipment, hardware, and construction tools.
The formation of acetal plastics involves distilling hydrocarbon chains into smaller parts and then polymerizing them using catalysts. The method of formulation depends on the type of acetal plastic and is generally split into homopolymer acetal and copolymer acetal processes. Acetal homopolymer, also known as POM-H, is a type of acetal plastic with a uniform crystalline structure. It offers higher stiffness, flex fatigue resistance, and creep resistance compared to copolymers. One example of an acetal homopolymer is Delrin, a brand-specific POM homopolymer from DuPont. Delrin is widely used in industrial applications such as valve components, pumps, gears, insulators, and rollers. It has superior room temperature strength, stiffness, and toughness.
On the other hand, copolymer acetal, also known as POM-C, has improved chemical resistance and lower moisture absorption. It also tends to have less porosity than homopolymer acetal, making it the preferred choice for food contact and medical applications. Food Grade Acetal, for example, is an FDA-compliant copolymer acetal that is optically detectable and suitable for food contact. It offers good mechanical and wear properties, low moisture absorption, and ease of machining.
In addition to homopolymer and copolymer acetal plastics, there are also glass-filled and glass-reinforced acetal plastics. Glass-filled acetals use chopped glass fibers as a filler, making the parts stiffer. On the other hand, fiber-reinforced acetals use chemically treated glass fibers to enhance both stiffness and strength. These variations in the blends and formulations of acetal plastics allow for a wide range of applications and make acetal a versatile material in various industries.
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It is available in both homopolymer and copolymer forms
Acetal, also known as polyoxymethylene (POM), polyacetal, and polyformaldehyde, is an engineering thermoplastic. It is a semi-crystalline thermoplastic that is based on the formaldehyde molecule. Acetal plastic is commonly used as an alternative to metals in applications such as mechanical gears, electrical components, automotive products, sports equipment, and medical products.
Acetal is available in both homopolymer and copolymer forms. Homopolymer acetal (POM-H), also known as Delrin, is a registered trademark of DuPont. Delrin offers greater stiffness, slightly better tensile and impact strength, and a lower coefficient of friction. However, it is not used in the food industry due to its centreline porosity, which can allow bacterial growth. Copolymer acetal (POM-C), on the other hand, has little to no porosity at its centre, making it the preferred choice for food contact and medical applications. It also offers improved chemical resistance and performs well in continuous high-heat and hot water environments.
The method of formulation for acetal plastic depends on whether it is a homopolymer or copolymer. In the homopolymer process, aqueous formaldehyde building blocks are mixed with alcohols to form hemiformal, which is then distilled and dehydrated to release formaldehyde. These monomers are then polymerized in the presence of a catalyst, forming the acetal homopolymer. The copolymer process is more complex and begins with formaldehyde being acid-catalysed to form 1,3,5-trioxane.
Both homopolymer and copolymer acetal plastics have their unique advantages and are used in a variety of applications.
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Frequently asked questions
Acetal, also known as polyoxymethylene (POM), is a semi-crystalline thermoplastic. It is a high-strength, low-friction engineering plastic with excellent wear properties in both wet and dry environments.
Acetal plastic is commonly used as an alternative to metals in applications requiring precision parts. This includes mechanical gears, electrical components, automotive products, sports equipment, medical products, food equipment, hardware, and construction tools.
Acetal plastic has excellent dimensional stability and machining profile, rivalling even metals in its properties. It is easy to machine and has high strength, rigidity, and stability.
Acetal plastic is not suitable for all applications due to its porosity, which can allow liquid and gas leakages and bacterial growth under certain conditions. It is also susceptible to degradation in hot water and by certain chemicals.
