Omar Khalid
Plastics are usually hydrogenated carbon chains. Acids are reactive substances that work by donating a proton (hydrogen ion). The carbon in plastic has already been fully reacted, so there's nothing for the acid to do. However, some acids can dissolve plastic, while others corrode metal or react with glass. The factors that influence a plastic's resistance to acids include acid concentration, acid type, temperature, and length of exposure. Polypropylene (PP), for example, can withstand prolonged exposure to a wide variety of acidic chemicals, except for high-concentration acids.
| Characteristics | Values |
|---|---|
| Plastic's composition | Plastics are usually hydrogenated carbon chains |
| Acid's composition | Acids work by donating protons (hydrogen ions) |
| Plastic's resistance to acid | Varies depending on the type of plastic, acid concentration, acid type, temperature, and length of exposure |
| Plastic's compatibility with acid | Polypropylene (PP) is a semi-crystalline thermoplastic polymer that is widely used in the manufacture of containers, bottles, and storage items. It is affordable, versatile, lightweight, durable, and chemically inert, offering advantageous acid compatibility. Polyetheretherketone is a semi-crystalline thermoplastic that is resistant to traction, chemical products, and high temperatures. It is recognized for its physical and mechanical properties and is used in the aerospace, manufacturing, and food industries. Ethylene-chlorotrifluoroethylene is a fluoropolymer that is highly resistant to dilute and high-concentration acids and is used in the chemical and pharmaceutical industries. |
| Plastic's breakdown in acid | Some plastics can be dissolved or weakened by acids over time |
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What You'll Learn
Some plastics are resistant to acid
While plastics are usually made from hydrogenated carbon chains, some plastics are designed to be highly resistant to acids. This is because plastics are strong, lightweight, and chemically compatible, making them ideal for storing corrosive liquids. The most common types of acid-resistant plastics include polypropylene (PP), a semi-crystalline thermoplastic polymer that is widely used in the manufacture of containers, bottles, and storage items. PP is affordable, lightweight, and durable, with high chemical inertia, making it compatible with a wide variety of acidic chemicals.
Another type of acid-resistant plastic is polytetrafluoroethylene (PTFE), better known under the trade name Teflon®. PTFE is a high-performance plastic with impressive thermal resistance, capable of withstanding temperatures ranging from -200 °C to 260 °C. Its chemical inertness makes it resistant to most types of acids, and it is often used in containers and pipework for reactive and corrosive chemicals. PTFE also has a very low coefficient of friction, making it ideal for non-stick coatings and applications with sliding action parts, such as bearings and gears.
In addition to PP and PTFE, there are other high-performance plastics that offer excellent acid resistance. Polyetheretherketone (PEEK), for example, is a rigid plastic from the polyaryletherketone family that is used in aerospace, manufacturing, and the food industry. PEEK is resistant to traction, chemical products, and high temperatures, remaining stable up to 482 °F (250 °C). While PEEK retains its properties when exposed to weak or medium-strength acids, PVDF (Polyvinylidene fluoride) is a better choice for highly concentrated acids. PVDF is a high-performance plastic with superior mechanical, physical, and chemical properties within the fluoropolymer family. It is often used in demanding environments, such as the manufacture of tanks and liners that can withstand concentrated acids and corrosive chemicals at high temperatures.
Other notable acid-resistant plastics include Ethylene-chlorotrifluoroethylene (ECTFE), a fluoropolymer designed for corrosive environments, and Telene® pDCPD, which is known for its high tensile strength, impact resistance, and heat distortion temperature. These plastics are widely used in various industries, including chemical, pharmaceutical, and automotive, thanks to their unique properties and ability to withstand extreme conditions.
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Acid concentration, type, temperature, and exposure length matter
When it comes to plastics and their breakdown in acids, several factors come into play, including acid concentration, type, temperature, and exposure length. These variables collectively influence the degradation rate of plastics in acidic environments.
Acid Concentration: The concentration of the acid is a critical factor. Some plastics, like Polypropylene (PP), can withstand prolonged exposure to a wide range of acidic chemicals, but they may falter against certain high-concentration acids. On the other hand, plastics such as Polyvinylidene Fluoride (PVDF) and Ethylene-Chlorotrifluoroethylene (ECTFE) are designed to excel in corrosive environments, handling both dilute and high-concentration acids effectively.
Acid Type: Different acids pose varying levels of challenge to plastics. Polytetrafluoroethylene (PTFE), commonly known as Teflon®, is a chemically inert material that can stand up to most types of acids, even in highly corrosive settings. Its versatility makes it a go-to choice for demanding applications.
Temperature: Temperature plays a pivotal role in the breakdown process. While some plastics offer impressive thermal resistance across a wide temperature range, such as PTFE's operating range of -200 °C to 260 °C, others are more limited. For instance, Polyetheretherketone, a thermoplastic used in aerospace and manufacturing, maintains its stability up to temperatures of 482 °F (250 °C).
Exposure Length: The duration of exposure to the acid also matters. While PP can withstand extended periods in contact with most acidic chemicals, other plastics may have shorter exposure limits before their properties begin to deteriorate.
In summary, the interplay of acid concentration, type, temperature, and exposure length determines the resilience of plastics in acidic environments. Each factor contributes to the overall resistance of the plastic, making it essential to consider all these variables when selecting the appropriate plastic for a specific application.
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Polypropylene (PP) is a common acid-resistant plastic
While some plastics can break down in acid, there are several types of plastics that have been developed with chemical compatibility in mind, making them suitable for storing corrosive liquids and even concentrated acids. Polypropylene (PP) is one such commonly used acid-resistant plastic.
PP is a semi-crystalline thermoplastic polymer that is widely used in the manufacture of containers, bottles, and various storage items. It is often white in colour. Besides being affordable and versatile, it is also lightweight and very durable. PP has chemical inertia, which means it can withstand prolonged exposure to a wide variety of acidic chemicals. However, it is important to note that PP may not be suitable for applications involving high temperatures, and in such cases, other "higher-end" plastics like PVDF or ECFTE should be considered.
The resistance of a plastic to acids depends on several factors, including the acid concentration, acid type, temperature, length of exposure, wall thickness, and condition of the container. Therefore, it is essential to test the compatibility of a specific container and chemical under unique circumstances.
While PP is a commonly used acid-resistant plastic, there are other types of plastics that offer even higher performance in terms of acid resistance. For example, polytetrafluoroethylene (PTFE), better known under the trade name Teflon®, is a high-performance plastic that offers impressive thermal resistance to both cold and heat. PTFE can withstand even the most corrosive environments, resisting most types of acids. Another example is ethylene-chlorotrifluoroethylene (ECTFE), a fluoropolymer specifically designed for highly corrosive environments. It demonstrates excellent resistance to both dilute and high-concentration acids and is commonly used in the chemical and pharmaceutical industries.
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Hydrofluoric acid should be stored in plastic
Hydrofluoric acid is highly corrosive and reactive, particularly towards glass and metals. It is known to corrode glass and eat through silicon oxide, which is why it is not stored in glass containers. It also dissolves many metals, though not gold, platinum, silver, or nickel and its alloys.
Hydrofluoric acid is a weak acid, as it does not completely dissociate in water. However, it is highly soluble and toxic, and excessive intake can lead to dental and skeleton degradation. It is also a contact poison, causing deep, initially painless burns and tissue death.
Due to its corrosive and reactive nature, hydrofluoric acid is usually stored in plastic containers. Plastic is strong, lightweight, and highly resistant to acid. Several types of plastics have been developed with chemical compatibility in mind, making them ideal for storing corrosive liquids and concentrated acids.
Some plastics that can be used to store hydrofluoric acid include polyethylene, fluorocarbons such as Teflon, chlorosulfonated polyethylene, natural rubber, and neoprene. It is important to note that polytetrafluoroethylene is slightly permeable to hydrofluoric acid. Additionally, polypropylene (PP) is a semi-crystalline thermoplastic polymer that is widely used for storage due to its affordability, versatility, lightweight, and durable nature. It offers advantageous acid compatibility and can easily withstand prolonged exposure to a wide variety of acidic chemicals.
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Some acids can dissolve plastics
Acids are chemical substances that react with other substances by donating a proton (hydrogen ion). While all acids are reactive, not all acids react the same way or with the same substances. Some acids can dissolve plastics, while others corrode metal or react with glass. The compatibility of an acid with a particular plastic depends on factors such as acid concentration, acid type, temperature, and length of exposure.
Some plastics, such as low-density polyethylene (LDPE), are susceptible to damage from different environments, including acid-alkaline and temperature changes. In one study, LDPE was partially dissolved and suffered significant weight loss when treated with different reagents at room temperature.
However, there are several acid-resistant plastics that have been developed with chemical compatibility in mind. Polypropylene (PP), for example, is a widely used thermoplastic polymer that offers advantageous acid compatibility due to its chemical inertia. It can easily withstand prolonged exposure to a wide variety of acidic chemicals, except for high-concentration acids.
Other high-performance plastics, such as polytetrafluoroethylene (PTFE), are prized for their impressive thermal resistance and ability to withstand corrosive environments. PTFE can resist most types of acids due to its chemical inertness. Similarly, polyetheretherketone (PEEK) is a rigid plastic that remains stable and retains its properties even when exposed to weak or medium-strength acids at high temperatures.
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Frequently asked questions
It depends on the type of plastic and acid. Some plastics are highly resistant to acids and are used to store corrosive liquids and even concentrated acids. However, some acids can dissolve or corrode plastics.
The most important factors are acid concentration, acid type, temperature, and length of exposure.
Polypropylene (PP) is a common plastic that is affordable, versatile, lightweight, and durable, offering advantageous acid compatibility. Polytetrafluoroethylene (PTFE), also known as Teflon®, is a high-performance plastic that can withstand a wide range of temperatures and is chemically inert, making it resistant to most types of acids.
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