Sofia Martinez
Plastic off-gassing is a process by which volatile organic compounds (VOCs) are released into the air during plastics production or as newly manufactured plastic products settle in. VOCs are poisonous, carbon-containing chemicals that can cause eye, nose, and throat irritation, coughing, headaches, dizziness, nausea, respiratory issues, and more. To prevent plastic off-gassing, it is recommended to use plastics with low VOC counts, increase ventilation, and install filtration systems, such as activated carbon filters and reverse osmosis systems. Choosing low-outgassing plastics, such as PEEK, PTFE (Teflon®), PVDF, Vespel®, and Halar® (ECTFE), is crucial for applications in high-heat environments, vacuum applications, or enclosed spaces.
How to prevent plastic from off-gassing
| Characteristics | Values |
|---|---|
| Use plastics with low VOC counts | Choose products that are certified low or no VOCs |
| Increase ventilation | Open windows to allow air to circulate |
| Install filtration systems | Use air/liquid filtration systems, such as activated carbon filters or reverse osmosis systems |
| Use low-outgassing plastics | PEEK, PTFE (Teflon®), PVDF, Vespel®, Halar® (ECTFE) |
| Avoid high temperatures | High temperatures accelerate outgassing |
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What You'll Learn
Use plastics with low VOC counts
The use of plastics with low VOC counts is an effective strategy to prevent plastic off-gassing. Volatile Organic Compounds (VOCs) are chemicals emitted by polymeric materials, which include plastics, textiles, and food storage containers. These VOCs can have negative impacts on human health, with prolonged exposure causing headaches, respiratory illnesses, hormone disruption, and even certain cancers.
Plastics with low VOC counts are available and should be chosen, especially for applications involving high heat, vacuums, or enclosed spaces. This is because high temperatures accelerate the off-gassing process, as VOCs are more likely to vaporize and be released into the air. Off-gassing can also occur due to other factors such as thermal stress, ultraviolet (UV) radiation, and the interaction between additives and polymeric molecules. Therefore, selecting plastics with low VOC counts can help mitigate the risks associated with off-gassing.
There are several low-outgassing plastics that offer high performance and can be used in challenging environments:
- PEEK (Polyether Ether Ketone) is a high-performance engineering plastic that exhibits excellent chemical resistance, superior hardness, and high tensile and flexural strength. It is commonly used in industries such as semiconductor, oil and gas, and aerospace.
- PTFE (Teflon®) is a synthetic fluoropolymer with high-temperature tolerance, self-lubricating properties, and good electrical insulation. It is often used in vacuum systems and has the lowest coefficient of friction of any plastic.
- PVDF (Polyvinylidene Fluoride) is a high-purity plastic suitable for vacuum applications and is commonly used for chemical tank liners and semiconductor components.
- Vespel® is a polyimide that can withstand extremely high temperatures without losing its mechanical properties. It offers excellent creep resistance, high impact resistance, and superior wear performance.
- Halar® (ECTFE) is a strong and stiff fluoropolymer with high impact strength, excellent fire resistance, and good electrical properties. It is easy to process and has exceptional chemical resistance.
By opting for plastics with low VOC counts, such as the ones mentioned above, you can effectively reduce the off-gassing of plastics and minimize the potential health risks associated with VOC exposure.
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Increase ventilation
Increasing ventilation is a crucial step in reducing the concentration of harmful off-gassed chemicals in the air. This is especially important in enclosed spaces, where the air is stagnant and VOCs can easily accumulate. Here are some ways to increase ventilation to mitigate the effects of plastic off-gassing:
Open Windows and Doors
Opening windows and doors can help improve air circulation and allow VOCs to escape. This is a simple yet effective way to prevent the buildup of off-gassed chemicals in indoor spaces. Keep windows slightly cracked open, especially when the room is not in use, to facilitate continuous air exchange.
Use Fans
In spaces without windows or where opening windows is not feasible, using fans can help create air movement and improve ventilation. Portable fans can be placed near plastic products or in areas where off-gassing is a concern to circulate air and disperse VOCs.
Install Ventilation Systems
In industrial settings, such as plastics processing plants, installing proper ventilation systems is essential. These systems should be designed to capture and remove VOCs from the air, ensuring that the air is continuously exchanged and purified. Ventilation systems can also be coupled with filtration systems to further reduce VOC concentrations.
Cross-Ventilation
In building design, incorporating cross-ventilation strategies can help reduce the impact of off-gassing. This involves strategically placing windows and doors to create air pathways that bring in fresh air and remove stale air. Cross-ventilation can be enhanced by the careful placement of fans and the use of windcatchers or other passive ventilation techniques.
Local Exhaust Ventilation
In areas where plastic processing or high-temperature applications occur, local exhaust ventilation can be employed. This involves capturing VOCs and other pollutants at their source, such as near machinery or specific processes, and removing them before they can disperse into the general workspace. This type of ventilation is commonly used in industrial settings to protect workers from inhaling harmful off-gassed chemicals.
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Install filtration systems
Installing filtration systems is an effective way to prevent plastic from off-gassing and protect human health and the environment. Off-gassing occurs when volatile organic compounds (VOCs) are released into the air during plastic processing, posing risks to individuals involved in production and the environment.
Air Filtration Systems
High-quality air filtration systems are essential to capture and eliminate VOCs released during plastic processing. Activated carbon filters are highly effective in this context due to their vast surface area and numerous pores that can adsorb VOCs from the air. These filters trap VOC molecules, preventing their dispersion and protecting workers and the surrounding environment.
Water Filtration Systems
Water is also used during plastics processing, and it is important to address the potential presence of VOCs in this water. Implementing water filtration systems that specifically target VOC removal is crucial to preventing contaminated water from entering the water supply.
Filtration in Research and Testing
In research settings, filtration plays a critical role in minimizing procedural sample contamination. For example, when studying microplastic removal from drinking water, filtration is conducted in a controlled environment with HEPA air filters to ensure accurate results and prevent false positives.
Filtration in Buildings
In buildings, off-gassing can occur from various sources, including furnishings, finishes, carpets, paints, and other interior products. While increasing ventilation is often recommended, filtration systems can also play a role in improving indoor air quality. Air purifiers, for example, can help capture and remove VOCs from the air, reducing potential health risks associated with off-gassing.
In summary, installing and utilizing effective filtration systems is a crucial component of preventing plastic from off-gassing and mitigating its potential negative impacts. By addressing both air and water filtration, it is possible to create safer environments for workers, protect the natural environment, and ensure the accuracy of scientific research related to off-gassing and plastic pollution.
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Use low-outgassing plastics in high-heat environments
Plastic off-gassing is a crucial consideration for components intended for use in high-heat environments, vacuum applications, or enclosed spaces. High temperatures accelerate the off-gassing process, increasing the release of volatile organic compounds (VOCs) into the air. VOCs are carbon-containing chemicals that can irritate the eyes, nose, and throat, and cause coughing, headaches, dizziness, and nausea. To prevent this, it is essential to use low-outgassing plastics in high-heat environments.
Low-outgassing plastics, such as PEEK, PTFE (Teflon®), PVDF, Vespel®, and Halar® (ECTFE), are designed to withstand high temperatures while minimising VOC emissions. PEEK, for example, offers high-temperature resistance, superior hardness, and excellent chemical resistance. PTFE, commonly used in vacuum systems, is tolerant of high temperatures and has the lowest coefficient of friction of any plastic. PVDF is suitable for vacuum applications and is often used for chemical tank liners. Vespel® can withstand extremely high temperatures without losing its mechanical properties and offers superior wear performance. Halar® (ECTFE) is a strong and stiff fluoropolymer with excellent fire resistance and chemical resistance.
When selecting low-outgassing plastics, it is important to consider the specific requirements of the application. For instance, PTFE is an excellent choice for vacuum systems due to its self-lubricating properties, while PEEK's metal-like durability makes it suitable for challenging environments in industries such as aerospace and semiconductor manufacturing. Additionally, it is worth noting that while low-outgassing plastics significantly reduce VOC emissions, they may not entirely eliminate off-gassing. Combining the use of low-outgassing plastics with improved air and liquid filtration systems can further enhance the reduction and elimination of off-gassing.
To summarise, preventing plastic off-gassing in high-heat environments requires the use of low-outgassing plastics, such as PEEK, PTFE, PVDF, Vespel®, and Halar® (ECTFE). These plastics offer high-temperature resistance and minimise VOC emissions. By selecting the most suitable low-outgassing plastic for the specific application and combining it with effective filtration systems, you can effectively reduce the release of harmful VOCs and protect both workers and equipment.
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Choose solid wood instead of composite furniture
Off-gassing is a process by which volatile organic compounds (VOCs) are released into the air during plastics production. VOCs are also released from plastics over their lifetime, including from composite furniture, which combines wood and plastic. This off-gassing can be harmful, causing eye, nose, and throat irritation, coughing, headaches, dizziness, nausea, and even respiratory illnesses, hormone disruption, and cancer.
To prevent off-gassing, it is recommended to use solid wood furniture instead of composite furniture. Solid wood is healthier and more durable than composite wood. When buying solid wood furniture, ensure that all parts of the furniture are made of solid wood, and opt for sustainably sourced and organic options. Solid wood furniture can also be finished with non-toxic finishes.
Composite furniture, on the other hand, is made of several ingredients, including wood and plastic, which are pressed together under pressure. While composite furniture is more lightweight and budget-friendly, it is less sturdy and durable than solid wood. Composite furniture is more prone to chipping and breaking, especially in active households with children.
By choosing solid wood furniture, you can reduce your exposure to VOCs and create a healthier indoor environment for you and your family. Additionally, consider other prevention measures such as increasing ventilation, installing filtration systems, and sourcing fabrics without chemical stain repellents.
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Frequently asked questions
Off-gassing is the release of volatile organic compounds (VOCs) from plastics and other materials. It often occurs when plastic is exposed to high temperatures, which is common during the manufacturing process. VOCs are carbon-containing chemicals that can be harmful to human health, causing eye, nose, and throat irritation, coughing, headaches, dizziness, nausea, respiratory issues, and more. The "new car smell" is a well-known example of off-gassing.
To prevent plastic off-gassing, it is recommended to use plastics with low VOC counts or choose low-outgassing plastics, especially for high-heat environments, vacuum applications, or enclosed spaces. Additionally, increasing ventilation and installing effective air and water filtration systems can help capture and eliminate VOCs from the air and water used during plastics production.
Yes, there are specific types of plastic known for their low off-gassing properties. For instance, PEEK is a high-performance engineering plastic with excellent chemical and temperature resistance, superior hardness, and high tensile strength. PTFE (Teflon®) is another option, known for its self-lubricating properties, high-temperature tolerance, and good electrical insulation. PVDF, a polyvinylidene fluoride, is commonly used in vacuum systems and chemical tank liners due to its high-purity and suitability for vacuum applications.
