Maya Ellison
Plastic is a versatile material used in a wide range of applications, from household items to industrial machinery. Its durability and resistance to various substances, including acids, make it well-suited for many purposes. The chemical resistance of plastics varies depending on factors such as acid concentration, acid type, temperature, and length of exposure. Some plastics, like polypropylene (PP), are widely used due to their affordability and durability, while others, like Teflon® (PTFE), are known for their exceptional chemical inertness and resistance to most types of acids. The unique properties of acid-resistant plastics, including their ability to withstand corrosive environments, make them highly desirable in industries such as aerospace, manufacturing, and food production.
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What You'll Learn
- The chemical formula of a plastic determines its resistance to acids
- Factors like temperature, concentration, duration, and mechanical load impact acid resistance
- Teflon (PTFE) is a widely recognised plastic that is acid-resistant
- PVDF and ECTFE are higher-end plastics that can withstand high-temperature acids
- Acid-resistant plastics are in high demand across various industries
The chemical formula of a plastic determines its resistance to acids
The chemical resistance of plastics is influenced by factors such as temperature, concentration, duration of exposure, and mechanical load. For instance, polypropylene (PP) is a durable and chemically inert thermoplastic that can withstand prolonged exposure to various acidic chemicals, except for certain high-concentration acids. At high temperatures, "higher-end" plastics like PVDF or ECTFE are recommended.
ECTFE, or Halar®, is known for its exceptional chemical resistance, including resistance to sulphuric acid. It can withstand harsh chemicals, acids, and solvents without compromising its mechanical properties. Similarly, polytetrafluoroethylene (PTFE), also known as Teflon®, is highly chemically inert and can resist most types of acids.
Another plastic with excellent chemical resistance is polyetheretherketone (PEEK). PEEK offers outstanding resistance to harsh chemicals, although it is less resistant to hydrofluoric acid and phenol. PPS, or polyphenylene sulfide, has even greater chemical resistance than PEEK, although it operates at a slightly lower temperature.
When selecting a plastic for a specific application, it is essential to consider its chemical compatibility chart, which provides information on how well a plastic resists chemicals at different concentrations. Environmental factors, such as temperature and exposure duration, also play a crucial role in determining the plastic's resistance to acids and other chemicals.
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Factors like temperature, concentration, duration, and mechanical load impact acid resistance
Several factors, including temperature, concentration, duration, and mechanical load, influence a plastic's resistance to acids.
Temperature plays a crucial role in determining how a plastic interacts with chemicals. For instance, polyolefins like HDPE and polypropylene function best at low to moderate temperatures. However, at extremely high temperatures, they tend to soften and lose their shape. Therefore, it is essential to specify the temperature requirements when selecting a plastic to ensure compatibility with the intended application.
The concentration of the acid is another critical factor. A chemical in its pure form differs significantly from a diluted one. Some plastics, like polypropylene (PP), offer advantageous acid compatibility due to their chemical inertia and can withstand prolonged exposure to various acidic chemicals, except a few high-concentration acids. However, for applications involving high temperatures and high-concentration acids, higher-end plastics like PVDF or ECFTE are recommended.
The duration of exposure to acids is also important. While some plastics can withstand prolonged exposure to certain acids, others may not. Therefore, it is crucial to consider the length of time a plastic part will be exposed to chemicals when making a selection.
Lastly, mechanical load, or external stress, can impact a plastic's resistance to acids. When a chemical weakens the structure of a plastic, external forces can cause thin, spiderweb-like cracking, affecting the physical structure and performance of the plastic part. Therefore, it is essential to consider the mechanical load a plastic will be subjected to when evaluating its acid resistance.
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Teflon (PTFE) is a widely recognised plastic that is acid-resistant
The chemical resistance of plastics is determined by their chemical formula, with some plastics able to withstand strong acids and others that will quickly decompose or dissolve. One such acid-resistant plastic is Teflon, also known as polytetrafluoroethylene (PTFE). PTFE is a fluoropolymer with high-performance capacity that is chemically inert and stable across a broad temperature range. This means that it is resistant to most types of acids, even the most corrosive ones, and can withstand prolonged exposure to high-concentration acids. PTFE is also hydrophobic, with a high flexural strength and the lowest coefficient of friction of any plastic.
Teflon-coated products have been widely commercialised, with PTFE coatings used on non-stick cookware and in plumbing applications. PTFE is also used in industrial applications, such as the lining of containers and tubing for highly corrosive chemicals, including hydrofluoric acid. Its extreme non-reactivity and high-temperature rating make it ideal for use in industrial pipe lines that utilise acids, alkalis, and other chemicals. PTFE is also used in thread seal tape, membrane filters, and dust collection systems.
In addition to its acid resistance, PTFE is known for its impressive thermal resistance, with an operating range of -200 °C to 260 °C. This makes it suitable for use in demanding environments, such as the chemical and pharmaceutical industries. PTFE is also used in the aerospace, manufacturing, and food industries due to its physical and mechanical properties, including its resistance to traction and high temperatures.
While PTFE is a widely recognised acid-resistant plastic, there are other plastics that offer excellent acid resistance as well. For example, polypropylene (PP) is a lightweight, durable, and affordable plastic that is often used in the manufacture of containers and storage items. It has advantageous acid compatibility and can withstand prolonged exposure to a wide variety of acidic chemicals, except for some high-concentration acids. Other high-end plastics, such as PVDF or ECTFE, are also used in applications that require high-temperature operation and resistance to a range of corrosive chemicals.
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PVDF and ECTFE are higher-end plastics that can withstand high-temperature acids
Plastic is resistant to acid due to various factors, including acid concentration, acid type, temperature, and length of exposure. Some plastics, such as polypropylene (PP), are widely used due to their versatility, durability, and chemical inertia, making them suitable for chemical storage tanks. However, for applications involving high temperatures, higher-end plastics like PVDF and ECTFE are recommended.
PVDF, or polyvinylidene fluoride, is a high-performance plastic with impressive mechanical, physical, and chemical properties. It is often used in demanding environments, such as the manufacture of tanks and liners, due to its ability to withstand concentrated acids and other corrosive chemicals at high temperatures. PVDF is also known for its exceptional resistance to saline solutions, hydrocarbons, oxidizing agents, alcohols, and halogens, making it suitable for the semiconductor industry.
ECTFE, or ethylene-chlorotrifluoroethylene, is a fluoropolymer developed for corrosive environments. It has excellent resistance to dilute and high-concentration acids, even at high temperatures, and is commonly used in the chemical and pharmaceutical industries. ECTFE is also known for its UV resistance and is often used for corrosion protection in applications involving sulfuric acid, nitric acid, and hydrogen halides.
Both PVDF and ECTFE offer superior performance in terms of acid resistance, mechanical properties, and purity. They are ideal for applications requiring excellent barrier properties and high-temperature performance, making them valuable in various industrial and chemical processes.
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Acid-resistant plastics are in high demand across various industries
One of the most well-known acid-resistant plastics is Teflon™ (PTFE), recognised for its impressive thermal resistance and ability to withstand even the most corrosive environments. PTFE has a wide operating temperature range, from as low as 200°C to 260°C, and is chemically inert, making it resistant to most types of acids. Its low coefficient of friction means that nothing sticks to it, and it is widely used as a non-stick coating for cookware.
Polyvinylidene fluoride (PVDF) is another acid-resistant plastic with impressive mechanical, physical, and chemical properties. PVDF is resistant to a wide range of high-concentration acids and is utilised in industries such as mining, plating, metal preparation, pharmaceutical, and food and beverage. Its natural flame retardancy and high flexural strength make it ideal for jacketing fibre optic cables and copper cables.
Other notable acid-resistant plastics include Polyether Ether Ketone (PEEK), which offers outstanding chemical resistance to harsh chemicals, excellent mechanical strength, and dimensional stability; and Halar® (ECTFE), which tops the list for chemical resistance in plastics, resisting even harsh chemicals, acids, and solvents like sulphuric acid.
The demand for acid-resistant plastics is driven by their unique properties, including chemical and corrosion resistance over wide temperature ranges and other extreme environmental conditions. These plastics play a crucial role in ensuring safe and compliant laboratories, manufacturing facilities, and various industrial applications.
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Frequently asked questions
The chemical resistance of plastics is determined by a particular plastic’s chemical formula. Some plastics can withstand strong acids with negligible effects on their mechanical properties, while others will decompose or dissolve in a short period of time.
Some plastics that are resistant to acid include:
- Polypropylene (PP)
- Polytetrafluoroethylene (PTFE) or Teflon®
- Polyetheretherketone
- Ethylene-chlorotrifluoroethylene (ECTFE) or Halar®
- Polyvinylidene fluoride (PVDF) or Kynar®
- Telene® pDCPD
Important factors that influence a plastic’s resistance to acids include acid concentration, acid type, temperature, and length of exposure.
Acid-resistant plastics are used in a number of industries due to their chemical and corrosion resistance over wide temperature ranges and other extreme environmental conditions. They are often used in the manufacture of containers, bottles, storage items, and chemical storage tanks.
Yes, some plastics that are not resistant to acid include Acetal and PEEK. Acetal has a lower resistance to acids, while PEEK is not resistant to hydrofluoric acid and phenol.
