Sofia Martinez
Degradable plastic is a term typically used to refer to traditional petroleum-based plastics that have been treated with additives to enhance their ability to degrade or biodegrade in different environments. While every product and material is technically degradable, the additives in degradable plastics are intended to make them degrade more rapidly in at least one environment, such as land, ocean, compost, or landfill. Biodegradable plastics, a type of degradable plastic, are defined by their ability to break down into substances found in nature, such as bacteria, fungi, and algae, within a reasonable timeframe. However, it's important to note that biodegradable plastics don't always meet compostability standards and may not completely degrade in natural surroundings, leaving harmful residues in landfills or oceans. Compostable plastics, on the other hand, are designed to break down in industrial composting facilities and are, therefore, a better choice for the circular economy.
| Characteristics | Values |
|---|---|
| Definition | There is no specific definition for "degradable plastic". |
| General Understanding | Degradable plastic refers to traditional petroleum-based plastic treated with additives to enhance its ability to degrade or biodegrade in different environments. |
| Examples of Degradable Plastics | Polybutylene adipate terephthalate (PBAT), Polyglycolic acid, Polybutylene succinate, Poly(vinyl alcohol), Poly(hydroxyalkanoates) (PHAs), Poly(2-hydroxypropanoic acid) (Polylactic acid, PLA), Poly(ethenyl alcohol) (Polyvinyl alcohol, PVA) |
| Biodegradation Process | Degradation by microorganisms into water, carbon dioxide (or methane) and biomass under specified conditions |
| Compostability | Degradable plastics do not meet compostability standards and will not effectively decompose in home or industrial composting systems. |
| Environmental Impact | Biodegradable plastics may leave harmful residue and not degrade entirely in landfills or oceans, contributing to plastic pollution. |
| Certifications | Biodegradable plastic is not required to be certified like compostable plastic, which meets industry standards such as EN 13432 in Europe and ASTM D6400 in the US. |
| Alternative Options | Opting for recycled content and packaging made from materials like seaweed, sugar beets, or plants is a more sustainable choice to reduce environmental impact. |
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What You'll Learn
Degradable plastic is not always the eco-friendly alternative
The term "degradable plastic" typically refers to traditional petroleum-based plastics treated with additives to enhance their ability to degrade or biodegrade in different environments. However, degradable plastic is not always the eco-friendly alternative that people perceive it to be.
Firstly, it is important to note that there is no specific definition for "degradable plastic," and the term can be misleading. While degradable plastics are intended to break down more rapidly than standard plastics, they may still take years to fully degrade in natural surroundings. For example, biodegradable plastic shopping bags were found to still be present in soil 27 months after being buried, challenging the notion that they will "disappear" quickly.
Secondly, degradable plastics do not meet compostability standards and will not decompose effectively in home or industrial composting systems. They are designed to break down in specific conditions, such as controlled lab settings, but nature does not provide such controlled conditions. As a result, biodegradable plastics may not actually biodegrade in the natural world if littered, leading to the same consequences as their non-biodegradable counterparts—polluting ecosystems and contributing to the plastic pollution crisis.
Additionally, the additives used in degradable plastics can have unintended consequences. For instance, oxo-degradable plastics are conventional plastics with additives that accelerate the oxidation process. While they break down quickly, they persist as large quantities of microplastics rather than any biological material, and they do not meet biodegradability standards. Furthermore, the idea of adding properties to encourage biodegradation in landfills is counterintuitive to reducing landfill gas emissions, specifically methane, which has a high global warming potential.
Lastly, the production of biodegradable plastics may not always be environmentally friendly. While some biodegradable plastics are made from bio-based sources like seaweed, sugar beets, or plants, others are still derived from non-renewable fossil fuels, oil, and natural gas. Making a plastic from a renewable resource does not guarantee its disposal will be eco-friendly, and some biodegradable plastics may leave harmful residues in landfills or oceans.
In conclusion, while the concept of degradable plastic seems appealing, it is not a catch-all solution to the environmental impact of plastics. Compostable materials, recycled content, and properly sourced biodegradable plastics can be more eco-friendly alternatives.
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Compostable plastic is a better option for the circular economy
The term "degradable plastic" typically refers to a traditional petroleum-based plastic treated with additives to enhance its ability to degrade or biodegrade in different environments. However, the effectiveness of degradable plastics is questionable, as they may not always break down as intended. For instance, biodegradable plastic shopping bags were found to still be present in soil 27 months after being buried.
Compostable plastic, on the other hand, is developed and tested to ensure it breaks down effectively in a composting facility. It is a better option for the circular economy for several reasons. Firstly, compostable plastic can break down faster than biodegradable plastic, although it requires an industrial setting for proper decomposition. Secondly, compostable plastic is often made from bio-based sources like seaweed, sugar beets, or other plants, instead of fossil fuels, reducing the consumption of finite resources.
Additionally, compostable plastic can play a helpful role in reducing waste in specific applications. For example, compostable takeout containers can compost the remaining food residue alongside the container itself. Compostable solutions can also prevent contamination of organic materials and ensure more of them can be safely returned to the soil, contributing to regenerating soils and building a healthy food system.
However, it is important to note that compostable plastic is not a silver bullet solution. An effective collection and composting infrastructure is essential but often lacking. Businesses should first consider if elimination or reuse might be better solutions, as the priority in a circular economy is to prevent waste creation in the first place.
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Biodegradable plastic is defined by its ability to break down into natural substances
Biodegradable plastic is a type of plastic that can be broken down by microorganisms into natural substances such as water, carbon dioxide, methane, and biomass. It is important to note that not all biodegradable plastics are compostable, and they may not always break down as intended. The term "biodegradable plastic" refers to the ability of the plastic to break down into substances like bacteria, fungi, and algae within a short amount of time. However, the success of biodegradation depends on various factors, and it may take years for biodegradable plastics to fully degrade in natural surroundings.
There are two main classes of biodegradable plastics: bioplastics and plastics made from petrochemicals with biodegradable additives. Bioplastics are derived from renewable raw materials, such as biomass, ethanol, and ethene. On the other hand, petrochemical-based biodegradable plastics are made from conventional finite resources but are manufactured to degrade faster than ordinary plastics. An example of this is Polybutylene Adipate Terephthalate (PBAT).
The production of biodegradable plastics is increasing, with businesses opting for more eco-friendly packaging. However, it is important to understand the potential environmental impact of these materials. While biodegradable plastics can help reduce waste, they may not always be the most sustainable option. For example, they may leave harmful residues and not degrade entirely in landfills or oceans. Additionally, the process of biodegradation can release methane, a potent greenhouse gas, contributing to global warming.
To address the challenges associated with biodegradable plastics, universal standards have been implemented, and a compostable logo has been introduced to guide consumers. Compostable plastic, on the other hand, is developed and tested to ensure it will break down properly in a composting facility, either at home or in an industrial setting. It is important to dispose of compostable materials properly to ensure they break down as intended.
Overall, biodegradable plastic is defined by its ability to break down into natural substances, but it is important to consider the limitations and potential environmental impacts of these materials. While they can play a role in reducing waste, proper disposal and a comprehensive understanding of their biodegradation process are crucial for minimizing negative consequences.
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Petroleum-based biodegradable plastics exist
The term "degradable plastic" typically refers to a traditional, petroleum-based plastic that has been treated with additives to enhance its ability to degrade or biodegrade in different environments. Petroleum-based biodegradable plastics do exist, but they are not the most widely used form of petroleum-based plastics. These biodegradable plastics are designed to degrade faster than ordinary plastics, but they may still take years to fully break down in natural surroundings.
The most common petroleum-based plastics, such as polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), and polystyrene (PS), are not biodegradable. However, there are some petroleum-based plastics that are biodegradable, such as polyglycolic acid (PGA) and polybutylene succinate (PBS). PGA is a thermoplastic polymer and an aliphatic polyester that is often used in medical applications due to its biodegradability. Through hydrolysis, PGA can degrade into its non-toxic monomer, glycolic acid, which can then be excreted as water and carbon dioxide. PBS is another thermoplastic polymer resin with properties similar to propylene, commonly used in packaging films for food and cosmetics.
In addition to these, there are other types of petroleum-based biodegradable plastics, such as polybutylene adipate terephthalate (PBAT), a biodegradable random copolymer, and poly(vinyl alcohol) (PVA), a water-soluble vinyl polymer used in 3D printing, food packaging, textiles coating, and healthcare products. However, it is important to note that not all biodegradable plastics are certified as compostable, and they may not completely decompose in home or industrial composting systems.
The primary purpose of biodegradable plastics is to address the environmental concerns associated with traditional plastics that persist in landfills and contribute to pollution. Biodegradable plastics can be broken down by microorganisms into water, carbon dioxide, and biomass, reducing their environmental footprint compared to petroleum-based plastics. Despite their advantages, biodegradable plastics still face challenges, such as the time required for complete degradation and the potential for harmful residue in landfills or oceans.
While petroleum-based biodegradable plastics exist, there has been a growing interest in bioplastics, which are produced from renewable biomass sources. Bioplastics can be fully bio-based, fully petroleum-based, or a blend of both, influencing their degradation degree and performance. PHAs, for example, are biodegradable plastics that can replace petroleum-based alternatives due to their flexible, crystalline, and thermally diverse properties. The development of bioplastics and biodegradable alternatives aims to reduce the accumulation of non-degradable plastic waste and minimize the environmental hazards posed by conventional petroleum-based plastics.
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Degradable plastic packaging
The term "degradable plastic" typically refers to traditional petroleum-based plastics treated with additives to enhance their ability to degrade or biodegrade in different environments. While standard untreated plastic is already degradable, additives are used to make it degrade more rapidly in at least one environment, such as land, ocean, compost, or landfill. However, there is no specific definition for "degradable plastic," and it is important to note that not all degradable plastics are biodegradable.
Biodegradable plastics are designed to break down into substances like bacteria, fungi, and algae within a short amount of time. They are commonly used for disposable items such as packaging, cutlery, and food service containers. Biodegradable plastic packaging includes materials like paper, cellulose, seaweed, and bio-plastics derived from plants like sugarcane, cassava, and corn. These materials have a weak molecular structure, allowing them to disintegrate quickly.
One example of a biodegradable plastic is polybutylene adipate terephthalate (PBAT), a biodegradable random copolymer. Another is polyglycolic acid (PGA), a thermoplastic polymer and aliphatic polyester often used in medical applications for its biodegradability. It can degrade into its non-toxic monomer, glycolic acid, through hydrolysis.
However, biodegradable plastics face several challenges. Many are designed to degrade in industrial composting systems, requiring a well-managed waste system. If these plastics end up in landfills, rivers, or oceans, they may not fully degrade and can contribute to plastic pollution. Additionally, some biodegradable plastics leave harmful residues and break down into microplastics rather than biological material. Compostable plastics, which are designed to break down in industrial composting facilities, are often considered a better choice for the environment.
When considering degradable plastic packaging, it is essential to understand the specific type of degradable plastic being used and its potential environmental impact. While biodegradable packaging can be a more sustainable alternative to conventional plastic, it is crucial to ensure that it fully breaks down and does not contribute to microplastic pollution.
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Frequently asked questions
Degradable plastic is a traditional petroleum-based plastic treated with additives that enhance the material's ability to degrade or biodegrade in different environments. Degradable plastic is designed to break down into substances found in nature, such as bacteria, fungi, and algae, within a reasonable timeframe.
Examples of degradable plastics include polyglycolic acid (PGA), polybutylene succinate (PBS), poly(vinyl alcohol) (PVA), and polybutylene adipate terephthalate (PBAT). These plastics can be used in various applications, such as medical sutures, food packaging, and agricultural films.
Degradable plastics are intended to reduce the environmental impact of plastic waste by accelerating the breakdown process. However, they may not always fully degrade and can leave harmful residues in landfills or oceans. Additionally, the additives used to enhance biodegradation can contribute to increased methane emissions, a potent greenhouse gas. Therefore, while degradable plastics may offer a partial solution, they are not a cure-all for plastic waste management and environmental sustainability.
