Maya Ellison
Plastic bags are a convenient way to store food, but not all plastic bags are food safe. Food-grade plastic bags are made from materials that are FDA-approved for direct food contact and are non-toxic, odourless, and chemically stable. Examples of food-grade plastics include HDPE, LDPE, and PP plastics. These plastics are commonly used in grocery bags, bread bags, and food storage boxes. However, it is important to note that not all food-grade materials are food safe. For instance, polystyrene (PS), often found in foamed food containers, can leach chemicals into food and is not recommended for kitchen use. Additionally, reusing plastic bags can increase the risk of foodborne illness, as they are designed to be disposable and can harbour bacteria. To maintain food safety, it is recommended to use glass, stainless steel, silicone, or ceramic containers, which have higher heat resistance and do not leak toxins.
| Characteristics | Values |
|---|---|
| Plastic bags made from | Polyethylene, Polypropylene, Polyethylene terephthalate, Nylon, LDPE, HDPE, PP, PS, Polycarbonate, Polylactic acid |
| Plastic bag safety | Non-toxic, odourless, chemically stable, non-leaching, heat-resistant, grease-resistant, shatter-resistant |
| Plastic bag usage | Single-use, reusable, dishwasher-safe, microwave-safe, freezer-safe |
| Risks | Toxin leaching, bacterial growth, foodborne illness |
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What You'll Learn
Plastic bags are not designed to be reused
Plastic bags are a major contributor to the world's plastic waste problem. They are designed to be thrown away after a single use, and yet hundreds of billions of them are used each year. While some people reuse plastic bags, this is not what they are designed for, and doing so may increase the risk of foodborne illness.
Plastic bags are made from fossil fuels and are harmful to the environment and wildlife. They end up as waste in landfills and the ocean, where they are ingested by birds, sea turtles, and fish, causing harm to these creatures and transferring toxins up the food chain.
To reduce plastic waste, some governments and institutions have banned or taxed plastic bags. As of July 2018, 127 countries had adopted some form of legislation to regulate plastic bags. Some companies are also taking initiatives to reduce waste, such as piloting reuse and refill systems or experimenting with more sustainable designs.
While plastic bags are recyclable, few people recycle them. They are lightweight and easily blown away, causing them to get stuck in recycling machinery. This is why many cities do not offer curbside recycling for plastic bags.
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Heat, harsh detergents, and age promote plastic degradation
Plastic bags are typically made from polyethylene, which is considered non-toxic. However, it is important to note that not all plastics are safe for food contact. Some plastics can leach chemicals into food, especially when exposed to heat, harsh detergents, or with age.
Heat can cause plastic to degrade and leach chemicals. It is advised to never microwave food in plastic, including containers marked "microwave-safe," as the term only indicates that the plastic won't be visibly damaged, not that it won't leach. Similarly, hot, acidic, or high-fat foods should not be stored in plastic containers, as these can also promote leaching.
Harsh detergents can also contribute to plastic degradation. When cleaning plastic containers, it is recommended to use warm water and mild dish soap, avoiding the dishwasher. Commercial food packaging and drink bottles should not be reused repeatedly as they become more prone to leaching with repeated cleanings. Additionally, certain chemicals in detergents, such as phosphates, bleach, formaldehyde, and ammonium compounds, can be toxic to the environment when dispersed in wastewater.
Age is another factor that promotes plastic degradation. Over time, plastic containers can become heavily worn or scratched, increasing the risk of leaching. It is recommended to recycle these containers and replace them with new ones.
Furthermore, different types of plastics have varying degradation rates and safety profiles. For example, #2 HDPE is used for milk jugs and is not known to leach toxins, while #6 PS, often found in foamed food containers, can leach chemicals and is not recommended for kitchen use. The specific environment, such as marine or landfill conditions, also influences the degradation rate, with plastics in the marine environment having a wider range of specific surface degradation rates (SSDRs).
In summary, while polyethylene plastic bags are generally considered non-toxic, heat, harsh detergents, and age can promote plastic degradation and leaching of compounds. It is important to follow safety guidelines, such as avoiding microwaving plastic and storing certain foods in plastic containers, to minimize potential health risks associated with plastic degradation.
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Some plastics are food-grade but not food-safe
Food-grade plastic does not necessarily equate to food-safe plastic. Food-grade plastic is considered anything that is okay to either consume or come into direct contact with food. Food-safe plastic, on the other hand, is food-grade plastic that is used as intended to prevent contamination or health risks.
For example, polyethylene is generally safe and non-toxic. However, polyethylene food safety involves not leaving containers in hot places. Otherwise, UV rays can break them down and become dangerous. Similarly, polypropylene is food-grade plastic that is used for bottles and food tubs and reusable containers. It is not known to leach toxins. However, it is only food-safe when used appropriately. For instance, polypropylene fabric is used for many applications, including bale wrap, and it is only food-safe when used for its intended purpose.
Food-grade plastic has to meet regulations and cannot contain dyes, additives, or any harmful products. Food-safe plastic can contain recycled materials, but these must fit the appropriate guidelines. The Food and Drug Administration is responsible for determining how materials may act when in contact with food.
Some high-quality food-grade plastic bags are microwave and dishwasher-safe, allowing you to cook and reheat food directly in the bag. However, it is important to double-check the specifications of the bags to ensure they can withstand high heat.
Plastic food storage bags are not designed to be reused. However, there may be times where it is safe to reuse them, such as when they are thoroughly washed and dried. Reusing plastic bags too many times can be risky as they are typically made from thin polyethylene, which can develop cracks over time that bacteria can settle into.
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HDPE, LDPE, and PP plastics are food-safe
Plastic bags are typically made from polyethylene, which is considered non-toxic. However, it is not recommended to reuse plastic bags, as they are not designed for repeated use and can become more prone to leaching with repeated cleanings. Additionally, plastic bags can develop cracks over time, providing spaces for bacteria to settle in.
However, not all plastics are created equal when it comes to food safety. Some types of plastic are considered safer for food contact and storage than others. HDPE, LDPE, and PP plastics are commonly used for food packaging and are generally regarded as safe.
HDPE (High-Density Polyethylene) is a type of plastic that is often used for food containers, cutting boards, and storage boxes. It is known for its rigidity and strength, and it provides excellent resistance to chemicals, mould, mildew, and corrosion. This helps to prevent toxins from leaching into food, making HDPE a safe choice for food storage.
LDPE (Low-Density Polyethylene) is a flexible and durable plastic used for bread bags, frozen food bags, squeezable bottles, and packaging. It is also considered safe for food contact and is not known to leach toxins. LDPE is a good choice for food storage as it is non-toxic, odourless, and chemically stable.
PP (Polypropylene) is a rigid, heat-resistant plastic often used for reusable food storage containers, microwavable meal trays, and yogurt cups. PP is also approved for food-grade packaging and is known for its high heat resistance. It does not leach toxins and is safe for microwave use. PP is ideal for packaging snacks, granola, nuts, and dried fruits due to its moisture and grease resistance.
While HDPE, LDPE, and PP plastics are considered food-safe, it is important to note that not all plastic containers are created equal. Some plastics, such as polystyrene (PS) and polycarbonate, can leach chemicals into food and should be avoided or used with caution. It is always important to check the recycling number on plastic containers to ensure they are safe for food storage. Additionally, it is generally recommended to avoid microwaving food in plastic containers, as heat can cause the breakdown of chemical bonds, potentially leading to toxin contamination.
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Glass, stainless steel, silicone, and ceramic containers are safer
Plastic bags are typically made from polyethylene, which is considered non-toxic. However, it is not advisable to reuse plastic bags, as they are designed to be disposable. Reusing them increases the risk of foodborne illnesses as they may harbour food particles and bacteria. Moreover, heat, harsh detergents, and old age promote the degradation of plastics and the leaching of compounds. Therefore, it is recommended to use glass, stainless steel, silicone, or ceramic containers for food storage.
Glass containers are a great alternative to plastic as they are non-toxic, BPA-free, and free of phthalates. They are also microwave-safe, freezer-safe, dishwasher-safe, and oven-safe. Glass containers are stain-resistant and odour-resistant, making them ideal for storing various foods. While glass containers are heavier and more breakable than plastic, they do not have the same health concerns associated with leaching.
Stainless steel containers are another safe option for food storage. They are more expensive than glass or silicone containers but offer durability and peace of mind regarding leaching concerns. Stainless steel is inert and does not react with food, ensuring that your meals remain safe and healthy.
Silicone is also a viable alternative to plastic. It is made from silica (sand) rather than petroleum and has not been linked to serious health effects like endocrine disruption, which many plastics have. Silicone is generally considered inert, but it is important to use it within the manufacturer's recommended temperature ranges to avoid increasing the transfer of volatile compounds into food.
Ceramic containers offer a similar advantage to glass in that they are oven-safe, microwave-safe, dishwasher-safe, and freezer-safe. They are versatile as you can cook, bake, and store food in the same container. Ceramics do not absorb food tastes or smells and are mostly able to resist stains. However, like glass, ceramics are heavier than plastic and require careful handling to prevent chipping.
In conclusion, while not all plastic bags are unsafe, it is advisable to opt for glass, stainless steel, silicone, or ceramic containers for food storage due to their non-toxicity, durability, and resistance to leaching. These alternatives provide safer and more sustainable options for your kitchen.
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Frequently asked questions
Food-grade plastic bags are made from materials that are FDA approved for direct food contact. The most common plastics used are polyethylene (PE) and polypropylene (PP). These plastics are non-toxic, odourless, and chemically stable.
Food-safe bags are specifically designed to be in contact with food without causing harm. Food-safe materials can include food-grade materials as long as they are used appropriately.
No, not all plastic bags are food-safe. For example, polystyrene (PS) is often found in foamed food containers and can leach chemicals into food.
Ziploc bags are food-safe as long as they are kept within their operating temperature range.
Plastic bags are not meant to be reused as they are disposable. However, there may be times when it is safe to reuse them, such as when storing dry, non-greasy foods, as long as they are thoroughly washed and dried.
