Ethan Clarke
Acetal, also known as polyoxymethylene (POM), is a strong, stiff, and durable engineering plastic with high strength, low friction, and low moisture absorption. Acetal is chemically resistant to hydrocarbons, solvents, and neutral chemicals. It is used in a wide range of applications, including bearings, bushings, pump and valve parts, gears, food processing and packaging machinery parts, electrical insulation, vehicle fuel sender units, and paintball accessories. Acetal is a thermoplastic, which means it can be warmed, melted, and solidified again, allowing it to be recycled. The formation of acetal plastics involves distilling hydrocarbon chains into smaller parts and then polymerizing them using catalysts. The two main types of acetal are copolymer and homopolymer, with the former being less porous and more suitable for wet and high-temperature environments, while the latter offers more stiffness and improved mechanical properties for more stable settings.
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What You'll Learn
- Acetal is a strong, stiff plastic with outstanding chemical resistance
- It has a wide range of applications, including in the automotive and electronics industries
- Acetal is a thermoplastic, which can be melted and solidified again, allowing it to be recycled
- It has two main types: copolymer and homopolymer, with slightly different properties
- Acetal is chemically resistant to hydrocarbons, solvents, and neutral chemicals
Acetal is a strong, stiff plastic with outstanding chemical resistance
Acetal, also known as polyoxymethylene (POM), polyacetal, and polyformaldehyde, is a unique thermoplastic with a wide range of applications. It is a semi-crystalline, engineered thermoplastic with high strength, low friction, and excellent dimensional stability. Acetal is a strong, stiff plastic with outstanding chemical resistance.
Acetal is resistant to moisture and many chemicals. It has a wide range of operating temperatures, from -40°F to 180°F (-40°C to 82°C). This makes it ideal for use in a variety of industries, including industrial, electronics, and transportation. In manufacturing, acetal is often used for precision parts requiring high stiffness, low friction, and tight tolerances, such as small components like washers and spacers.
The two general types of acetal plastic are copolymer acetal (POM-C) and homopolymer acetal (POM-H). Copolymer acetal offers improved chemical resistance and lower moisture absorption, while homopolymer acetal typically has higher strength and stiffness. Delrin® is a brand name for a type of homopolymer acetal that is commonly used. However, it is important to note that Delrin has centreline porosity, which can allow liquid and gas leakages and bacterial growth under certain conditions, making it unsuitable for medical or food processing applications.
Acetal is a popular choice for companies in a wide array of industries due to its unique combination of strength and dimensional stability. It is easy to machine and can be used in injection moulding processes to produce large numbers of high-quality parts quickly and economically. With its outstanding chemical resistance, acetal is an excellent choice for applications requiring strong, stiff materials that are dimensionally stable in different environments.
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It has a wide range of applications, including in the automotive and electronics industries
Acetal, also known as polyoxymethylene (POM), is a versatile engineering plastic with a wide range of applications, including in the automotive and electronics industries.
In the automotive industry, acetal is used for various parts, from small components that hold parts like dashboard panels, seating, and storage areas in place to visible parts like seat belt adjusters, HVAC knobs, and locks. Acetal's unique characteristics, such as its high strength, low friction, and excellent dimensional stability, make it an invaluable choice for automotive parts. It can withstand constant friction, repeated impact, and continuous operation, reducing maintenance and repair needs. Additionally, acetal's chemical resistance is particularly impressive, showing excellent resistance to fuels, oils, and cleaning agents, ensuring reliable performance in automotive applications.
In the electronics industry, acetal is used for the production of components, connectors, and tiny parts that require stiffness and may come into contact with wires or other heat-emitting parts. Its dimensional stability at various temperatures makes it ideal for parts that need to hold their shape, even around power sources. Acetal's natural lubricity reduces wear in moving parts, and its electrical insulation properties are advantageous in electronic applications.
Acetal's ease of machining and ability to create intricate parts with tight tolerances further enhance its versatility. It can be cut, routed, and thermoformed to suit specific needs, making it a popular choice for small parts and components in various industries, including automotive and electronics.
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Acetal is a thermoplastic, which can be melted and solidified again, allowing it to be recycled
Acetal, also known as polyoxymethylene (POM), polyacetal, or polyformaldehyde, is a unique thermoplastic. It is a semi-crystalline, engineering thermoplastic with a wide range of uses. Acetal is a strong, stiff plastic with excellent dimensional stability, high stiffness, low friction, and abrasion resistance. It is also resistant to moisture and many chemicals, although it is susceptible to degradation by acids, oxidation, and alkaline attack.
Acetal's ability to maintain its original dimensions when exposed to temperature and humidity changes makes it a powerful choice for companies in a wide array of industries. It is commonly used in industrial, electronics, and transportation applications, such as replacing metal bearings and bushings, and in the production of small components like washers and spacers.
The melting point of acetal varies by type, but it generally operates effectively between -40°F to 180°F (-40°C to 82°C). As a thermoplastic, acetal can be melted and solidified repeatedly, allowing it to be recycled. This cycle of melting, reforming, and cooling is a key advantage of thermoplastics in product manufacturing.
Acetal is sold under various trade names, such as Delrin® and Acetron®, with slightly different formulations adjusted to enhance specific properties. For example, Delrin® typically offers higher strength and stiffness, while acetal copolymer provides improved chemical resistance and lower moisture absorption.
Overall, acetal's unique properties and wide temperature range have made it one of the most sought-after plastics in the world, with applications in nearly every type of everyday company.
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It has two main types: copolymer and homopolymer, with slightly different properties
Acetal, also known as polyoxymethylene (POM), is a type of engineering thermoplastic. It has two main types: copolymer and homopolymer, with slightly different properties.
Copolymer acetal (POM-C) is free of centreline porosity, which results in a lower coefficient of friction and better impact and wear properties in wet applications. This type of acetal is used in the food industry, as it can be detected by optical scanners, metal detection equipment, and X-ray detection equipment. It is also used in the pharmaceutical industry due to its good machinability and mechanical properties.
Acetal homopolymer (POM-H), also known by the brand name Delrin®, typically has higher strength, stiffness, and better machining properties. However, it has centreline porosity, which can allow liquid and gas leakages and bacterial growth under certain conditions. This makes it unsuitable for medical or food processing applications. DuPont uses a process called satinizing to treat acetal homopolymer, creating a surface roughness sufficient for micromechanical interlocking.
Both types of acetal plastic share many mechanical properties, such as high stiffness, low friction, abrasion resistance, and excellent dimensional stability. Acetal is a popular choice in the industrial, electronics, and transportation industries. Its unique combination of strength and dimensional stability makes it sought-after by companies in a wide array of industries.
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Acetal is chemically resistant to hydrocarbons, solvents, and neutral chemicals
Acetal, also known as polyoxymethylene (POM), is a unique thermoplastic with a wide range of applications. It is known for its strength, stiffness, and dimensional stability, making it a popular choice across various industries. One of its key advantages is its chemical resistance, particularly to hydrocarbons, solvents, and neutral chemicals.
Acetal's resistance to hydrocarbons and solvents sets it apart from other plastics. Solvent welding, for instance, is typically unsuccessful on acetal polymers due to their excellent solvent resistance. This quality makes acetal ideal for applications where exposure to solvents or hydrocarbons may occur.
In terms of chemical resistance, acetal also stands out. It is resistant to a broad spectrum of neutral chemicals, which contributes to its versatility. This chemical resistance, coupled with its strength and stiffness, makes acetal a preferred material in industries such as automotive manufacturing, electronics, and transportation.
While acetal offers excellent resistance to hydrocarbons, solvents, and neutral chemicals, it is important to note that it is not impervious to all substances. Acetal resins are sensitive to acid hydrolysis and oxidation by agents such as mineral acids and chlorine. Additionally, POM homopolymer is susceptible to alkaline attack and degradation in hot water.
Overall, acetal's resistance to hydrocarbons, solvents, and neutral chemicals contributes significantly to its popularity as an engineering material. Its unique combination of strength, stiffness, and chemical resistance has led to its widespread use in various industrial applications, showcasing the material's adaptability and value in modern manufacturing.
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Frequently asked questions
Acetal, also known as polyoxymethylene (POM), polyacetal, and polyformaldehyde, is a strong, stiff, and durable engineering plastic with high strength, low friction, and low moisture absorption.
Acetal is used in a wide range of industries, including automotive and transportation, electronics, food processing, and construction. It is used in the production of small components such as washers, spacers, dashboard panels, seating, storage areas, gear wheels, bolts, and lock systems.
Acetal has excellent dimensional stability, wear and abrasion resistance, and impact resistance. It is also chemically resistant to hydrocarbons, solvents, and neutral chemicals. Acetal's high melting point and ability to maintain its physical characteristics across a wide range of conditions make it a good alternative to metals.
