Alexei Volkov
Oil and plastic are two materials that are seemingly incompatible, yet their interaction can lead to surprising changes in the properties of both materials. Some oils can degrade plastic containers, causing leaks, cracks, or even contamination of the oil itself. This is because some plastics are highly susceptible to degradation from oils, especially essential oils with high concentrations. Additionally, the volatility of certain oils can cause them to evaporate and create pressure, forcing molecules through seals or container walls. Understanding the effects of different oils on plastics is crucial to prevent unwanted consequences and ensure compatibility.
| Characteristics | Values |
|---|---|
| Plastic type | Polyethylene, Polypropylene, Polybutylene terephthalate (PBT), Nylon, Acetal, High-Density Polyethylene (HDPE) |
| Oil type | Cooking oils (canola, olive, sunflower, rapeseed), Essential oils, Motor oils, Mineral oils |
| Cause of leakage | Volatile compounds in oils evaporate and create pressure, Oils are wettable by plastics, Plastic degradation, Brittleness, Cracks, Discoloration |
| Preventative measures | Use glass containers, Use specialised plastic containers (e.g. HDPE, nylon, polypropylene), Avoid thin-walled plastic bottles |
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What You'll Learn
- Some plastics are more susceptible to degradation from oil
- Volatile compounds in oils can create pressure, forcing molecules through seals or container walls
- Oils can cause dust to adhere to plastic, creating stickiness
- Plastic containers made from polyethylene or polypropylene are best for long-term oil storage
- Motor oil can wreak havoc on certain plastics, causing them to become brittle or cracked
Some plastics are more susceptible to degradation from oil
The interaction between oil and plastic can lead to changes in the properties of both materials. Some plastics are highly susceptible to degradation from essential oils, especially if the concentration is high. This weakening of the plastic can lead to leaks, cracks, or contamination of the oil. Essential oils should be stored in glass or specialized plastic containers that are resistant to essential oil degradation, such as polypropylene plastic containers.
Everyday cooking oils, such as olive oil, sunflower oil, and canola oil, are less aggressive towards plastics, and people frequently store them in plastic containers without noticeable problems. However, with prolonged exposure, certain oils, such as rapeseed oil, can cause the plastic to become hazy, sticky, or discolored. This is because some drying oils, such as linseed oil, react with oxygen in the air to polymerize, forming a hard film. When the oil is in the midst of this change, it becomes sticky.
Motor oil can wreak havoc on certain types of plastics, causing them to become brittle, cracked, or discolored. Plastics that are compatible with motor oils include nylon, polypropylene, and certain types of high-density polyethylene (HDPE). HDPE is a common material for motor oil bottles due to its higher degree of polymerization, making it more resistant to dissolution by petroleum.
The choice of plastic for oil storage depends on the type of oil and the desired level of compatibility. For long-term storage of oils, plastic containers made from materials such as polyethylene or polypropylene are recommended. These synthetic lubricants can be more aggressive to plastics than natural oils, so selecting plastics rated for use with specific synthetic oils is crucial. Examples include polybutylene terephthalate (PBT), nylon, and acetal.
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Volatile compounds in oils can create pressure, forcing molecules through seals or container walls
Oils can sometimes leak through plastic containers, even when sealed. This is due to a combination of factors, including the volatility of the oil, the permeability of the plastic, and the presence of any imperfections in the seal or container walls.
Volatile compounds in oils can create pressure by evaporating at room temperature, which can then force oil molecules through the container's seals or walls. This is more likely to occur with certain types of oils, such as essential oils, which have a higher concentration of volatile compounds. The pressure builds up inside the container, and since there is no driving force for air to diffuse into the bottle to balance the pressure, the oil is pushed out through any available pathway. This can include tiny holes or imperfections in the seal or container walls.
The type of plastic used for the container also plays a crucial role in preventing oil leakage. Some plastics, such as high-density polyethylene (HDPE), are more resistant to oil permeation due to their higher degree of polymerization. On the other hand, thinner plastics with larger spaces between their polymer strings may allow oil molecules to pass through more easily. Additionally, certain oils can react with and degrade specific types of plastics, making them more susceptible to leakage over time.
To minimize oil leakage, it is essential to choose the appropriate plastic material for the specific type of oil being stored. For example, essential oils should be stored in specialized containers, such as those made of polypropylene, that are resistant to degradation. Motor oils are typically stored in HDPE containers, as this type of plastic is compatible and less susceptible to dissolution by petroleum-based products. By selecting the right plastic for the oil in question, leaks can be significantly reduced or prevented altogether.
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Oils can cause dust to adhere to plastic, creating stickiness
The type of plastic used also plays a role in whether oil will leak through it. Some plastics, such as high-density polyethylene (HDPE), are more resistant to oil leakage due to their higher degree of polymerization. On the other hand, thin-walled, cheap plastics may not provide an adequate barrier against oil seepage.
Additionally, the design of the container can contribute to oil leakage. Containers with squeeze tops or tubes that allow for upright dispensing may be more prone to leaking, as oil can collect around the screw thread and seal, eventually finding its way out.
It is worth noting that some oils, like linseed oil, can react with oxygen in the air to polymerize and form a hard film. This process can cause stickiness during the transition phase.
To prevent oil leakage and stickiness, it is recommended to use plastic containers made from materials such as polyethylene or polypropylene for long-term oil storage. These materials are designed to withstand extreme conditions and are less susceptible to degradation from oils.
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Plastic containers made from polyethylene or polypropylene are best for long-term oil storage
Plastic containers are a popular choice for storing oils. However, not all plastics are created equal when it comes to containing oils, and some are more susceptible to degradation and leakage. Essential oils, for example, can weaken plastic containers, leading to leaks, cracks, or contamination of the oil. Similarly, certain types of oils can cause plastic containers to become hazy, sticky, or discoloured over time.
So, which plastics are best for long-term oil storage? The answer is polyethylene and polypropylene. These plastics are widely used in industries where the safe handling and storage of chemicals are crucial, such as in laboratories and the pharmaceutical industry. Polypropylene containers, for instance, are used to store active ingredients and solutions in secure conditions.
Polypropylene is a thermoplastic polymer known for its strength and versatility. It has excellent chemical resistance, particularly against acids, bases, and organic solvents. This resistance means that polypropylene containers do not degrade, corrode, or break down when exposed to chemicals. Additionally, polypropylene containers have a nonstick surface that resists the adhesion of chemicals, residues, and mineral deposits, making cleaning and maintenance more manageable.
Polyethylene, another type of thermoplastic, shares some similarities with polypropylene but falls short in terms of heat resistance and mechanical strength for long-term usage. However, it is still a sturdy plastic that is commonly used for gas and oil storage. High-density polyethylene (HDPE), in particular, is often used for plastic gas cans and barrels because it insulates its contents and shields gas or oil from the surrounding heat.
When it comes to storing oils, it is essential to choose the right type of plastic container to prevent leaks and maintain the integrity of the oil. Polyethylene and polypropylene containers are ideal choices for long-term oil storage due to their chemical resistance, durability, and versatility.
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Motor oil can wreak havoc on certain plastics, causing them to become brittle or cracked
Motor oil can cause significant damage to certain types of plastics, leading to issues such as brittleness, cracking, or discolouration. This is due to the interaction between the oil and the plastic, which can alter the properties of both materials. While motor oil is crucial for keeping engines running smoothly, it is essential to choose the right type of plastic to avoid these potential issues.
The choice of plastic is critical when dealing with motor oil. Some plastics, such as nylon, polypropylene, and specific types of high-density polyethylene, are compatible with motor oils and can withstand prolonged exposure without degradation. These plastics have a higher degree of polymerization, making them more resistant to dissolution by petroleum-based products.
On the other hand, certain plastics are highly susceptible to the damaging effects of motor oil. Thin-walled, cheaply made bottles, for example, may not provide an adequate barrier against motor oil. The oil can eat away at the plastic, causing it to become brittle and cracked over time. This is often observed in plastic bags or containers with thin walls.
Additionally, the volatility of motor oil compounds can contribute to the issue. As the more volatile compounds in the oil evaporate, they create pressure that can force molecules through seals or container walls. This pressure, combined with the wettability of plastics by oils, can result in leaks and an oily residue on the container's surface.
To prevent these problems, it is essential to select the appropriate plastic for storing motor oil. Using containers made from materials such as polyethylene or polypropylene can ensure long-term storage without degradation. These synthetic lubricants are designed to perform well under extreme conditions and offer improved properties compared to natural alternatives. By choosing the right plastic, you can avoid the negative consequences of mixing motor oil with incompatible plastics.
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Frequently asked questions
Some plastics are highly susceptible to degradation from oils, especially essential oils in high concentrations. This causes the plastic to weaken and leads to leaks.
Polyethylene (PE) is a common plastic that is susceptible to degradation from oil.
Polypropylene plastic containers are best for storing essential oils. For long-term storage of oils, polyethylene or polypropylene containers are recommended.
Some plastic bottles have tubes that go to the bottom and can be squeezed from an upright position. The heating of the air in the bottle causes the oil to come out.
Most cooking oils are unsaturated and therefore more chemically reactive. When exposed to air, the oil oxidizes and polymerizes more rapidly, causing a sticky residue.
