Omar Khalid
Essential oils have surged in popularity for aromatherapy, skincare, and natural remedies. However, the question of whether it is safe to store them in plastic containers remains a complex one. The answer depends on various factors, including the type of plastic, the concentration and potency of the oil, and the duration of storage. Some plastics, such as HDPE and PET, are considered safe for diluted essential oils, while others like polystyrene can be easily dissolved by certain compounds in pure essential oils. Glass is generally recommended for storing pure essential oils, as it prevents leaks and maintains the oil's quality. However, plastic containers offer convenience, lightweight durability, and cost-effectiveness, making them a preferred choice for diluted oil mixtures.
| Characteristics | Values |
|---|---|
| Plastic containers suitable for essential oils | High-Density Polyethylene (HDPE), Polyethylene Terephthalate (PET), Polypropylene, Fluoropolymers (PTFE or FEP) |
| Plastic containers not suitable for essential oils | Polystyrene (plastic number 6) |
| Other suitable materials for essential oil containers | Glass, stainless steel, aluminum |
| Essential oil properties | Diluted, pure, citrus-based |
| Other factors | Container colour, cost, convenience, environmental impact |
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What You'll Learn
Diluted essential oils and plastic
Diluted essential oils are typically mixed with carrier oils like coconut oil, jojoba, or sweet almond oil. Diluting essential oils helps reduce their concentration, making them safe to use and easier to store.
Diluted essential oils are highly unlikely to have a high enough concentration to interact with their container. However, it is better to be cautious and use glass with DIY products, especially if you plan on storing them for a few weeks or longer. This is because some plastics are highly susceptible to degradation from essential oils, which can lead to leaks, cracks, or contamination.
If you are using plastic containers, opt for high-quality plastics like High-Density Polyethylene (HDPE) or Polyethylene Terephthalate (PET) plastics. These plastics have stronger bonds and longer chain lengths that are not broken up by essential oils. Other plastic containers may work if not reused and if only a small amount of oil is added at a high dilution rate.
To maintain the quality and safety of your diluted essential oils, store them in airtight containers, away from direct sunlight and heat.
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Glass vs plastic containers
Glass bottles are generally considered the best choice for storing essential oils. This is because essential oils are powerful and can break down or damage plastic containers over time, leading to leaks or a decrease in the oils' effectiveness. Plastic containers are porous, allowing air to pass through and causing the oils to break down. However, some plastics are resistant to degradation from essential oils, such as HDPE and PET. These plastics have stronger bonds and longer chain lengths that are not broken up by essential oils. They are commonly used in the food and beauty industries and are safe for storing essential oils.
When it comes to convenience and cost-effectiveness, plastic containers have the upper hand. They are lightweight, durable, and less expensive than glass. Plastic containers are also versatile and readily available in various shapes, sizes, and styles. However, not all plastics are suitable for essential oils. Some essential oils, such as lemon oil, can dissolve certain types of plastic, like polystyrene. Therefore, it is crucial to choose the right type of plastic for storing essential oils.
For storing pure essential oils, glass bottles with airtight lids are recommended. The oils should be kept in a cool, dark, and dry place to prevent deterioration and prolong their shelf life. Coloured glass containers, such as cobalt blue or amber-tinted glass, are ideal as they reflect sunlight and protect the oils. Stainless steel containers are also an option, providing a sturdy and unbreakable alternative to glass.
On the other hand, diluted essential oils can be stored in plastic containers, typically PET plastics. These plastics are less expensive and have high permeability resistance, making them suitable for storing diluted essential oil mixtures. However, it is important to ensure that the plastics are of high quality and have tight lids to prevent oxidation and maintain the quality of the oils.
In summary, while glass is generally the preferred choice for storing essential oils, certain plastics can also be used safely. The key is to choose the right type of plastic that is resistant to degradation from essential oils, such as HDPE or PET. For pure essential oils, glass bottles with airtight lids and coloured glass for sun protection are ideal. For diluted essential oils, PET plastics are a cost-effective and versatile option, provided that the lids are secure to maintain the oils' quality.
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Plastic containers for DIY products
When it comes to storing DIY products containing essential oils, it's important to choose the right type of container to ensure the safety and longevity of your creations. While glass is often recommended as the best choice for storing pure essential oils, it may not always be practical or convenient, especially if you plan to carry your DIY products around or store them in the shower. In such cases, plastic containers can be a good alternative.
Not all plastics are created equal when it comes to storing essential oils. Some essential oils have compounds that can dissolve certain types of plastic, leading to leaks, cracks, or contamination of your product. For example, polystyrene (plastic number 6) is easily dissolved by d-limonene found in lemon oil. Therefore, it's crucial to select a plastic that is resistant to essential oils.
High-Density Polyethylene (HDPE), or plastic number 2, is a safe option for storing diluted essential oils in DIY products. HDPE plastics have stronger bonds and longer chain lengths that are not affected by essential oils. These plastics are commonly used in caps, diffusers, and orifices specifically designed for essential oils. When choosing an HDPE container, look for the #2 recycling code to ensure it's suitable for essential oils.
Another suitable option is Polyethylene Terephthalate (PET), also known as plastic number 1. PET plastics are resistant to essential oils and are commonly used in the beauty and food industries due to their durability and resistance to degradation. They are also less expensive than glass containers. However, it's important to ensure that the PET containers are specifically designed for essential oils and made of high-quality material.
If you're unsure about the compatibility of your DIY product with a particular plastic, it's always a good idea to test a small batch first. Additionally, diluted essential oils in DIY projects are highly unlikely to have a high enough concentration to interact with the container. Nevertheless, it's recommended to use glass for long-term storage or if you plan to store homemade cleaners or personal care products.
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Safe plastics for essential oils
Essential oils are powerful and concentrated plant compounds with medicinal and aromatic properties. Caution is key when combining plastic and essential oils. 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 worse—contamination of your essential oils.
Pure essential oils are very potent and should be stored in airtight containers made of glass. Glass is impervious to essential oils and is easy to clean. It is also inexpensive and recyclable. Dark-coloured glass bottles, such as amber or cobalt blue, are recommended as they protect the oils from the sun's UV rays, which can cause deterioration.
Diluted essential oils are mixed with other products, such as carrier oils, and can be stored in plastic containers. Sturdy, food-grade plastic containers are generally considered safe for diluted essential oils. One common type of plastic that is resistant to essential oils is PET (plastic number 1). This type of plastic has a high permeability resistance rating and is less expensive than glass. Another safe plastic is HDPE (plastic number 2), which has stronger bonds and longer chain lengths that are not broken up by essential oils.
In summary, pure essential oils are best stored in airtight glass containers, while diluted essential oils can be stored in sturdy, food-grade plastic containers such as PET or HDPE.
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Oxidation, air, and water damage
While plastic containers are lightweight, cost-effective, versatile, and convenient for storing essential oils, they are susceptible to damage from oxidation, air, and water.
Oxidation occurs when essential oils react with the oxygen in the air, causing a loss of beneficial therapeutic properties and, in some cases, the oil's aroma. Citrus oils are the most likely to oxidize first, so they should be stored with a reliable airtight seal in a dark place that maintains a consistent temperature. Oxidation can also alter the chemical composition of the oils, reducing their effectiveness and potentially causing them to become skin irritants.
Essential oils are highly concentrated and potent, and their frequent and prolonged exposure to air and water can change their consistency, smell, and properties. Therefore, it is crucial to store them in airtight containers with tight lids to prevent oxidation and evaporation.
Some essential oils can also dissolve certain types of plastic over time, leading to leaks and contamination of the oils. This is due to the corrosive nature of the oils, which can break down the plastic. Additionally, certain plastics may need to offer more protection against UV rays, as essential oils are sensitive to light, and prolonged exposure can cause them to lose their aroma and therapeutic properties.
To protect essential oils from oxidation, air, and water damage, it is recommended to use glass containers or specialized plastic containers resistant to essential oils, such as HDPE (High-Density Polyethylene) or polypropylene. Glass is impervious to essential oils, easy to clean, and helps maintain the quality and purity of the oils.
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Frequently asked questions
It depends on the type of plastic and essential oil. Some essential oils can break down or damage plastic containers over time, leading to leaks or a decrease in the oil's effectiveness. However, certain plastics are considered suitable for storing diluted essential oils.
Polystyrene (plastic number 6) is easily dissolved by d-limonene in lemon oil. Other essential oils with high concentrations can also degrade plastic containers, so it is best to avoid them.
High-Density Polyethylene (HDPE), Polyethylene Terephthalate (PET), and polypropylene plastic containers are suitable for storing diluted essential oils. These plastics have stronger bonds and longer chain lengths that are resistant to the properties of essential oils.
Pure essential oils are best stored in airtight containers made of glass, such as dark amber or cobalt blue glass bottles, and kept in a cool, dry, and dark place away from direct sunlight.
Yes, properly lined and treated aluminum containers are a good option for storing both pure and diluted essential oils. Thick, sturdy, food-grade plastics can also be used for diluted essential oils but may not be suitable for long-term storage.
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