Maya Ellison
Plastic and wood are two materials that can be used in a variety of applications, including building materials and furniture. When burned, both materials exhibit different characteristics. For instance, wood generally has a lower temperature of combustion compared to other materials such as metal. On the other hand, plastic tends to burn hotter and faster than wood, with some plastics exhibiting unusual burning characteristics. The specific type of plastic also plays a role in its burning behaviour, with plastics composed of carbon, hydrogen, and oxygen burning slower than those composed of other elements. Understanding the burning properties of plastic and wood is crucial, especially in ensuring fire safety and managing waste disposal.
| Characteristics | Values |
|---|---|
| Burning speed | Plastic generally burns faster than wood. However, vinyl, a type of plastic, has been shown to burn slowly in solid form. |
| Ignition temperature | Plastic has a higher ignition temperature than wood. |
| Flame spread | Plastic has a flame spread 10 times that of wood. |
| Burning smell | Plastics composed of carbon, hydrogen, and oxygen burn with a smell similar to charred wood. Plastics containing nitrogen and sulfur produce toxic gases and choking smells when burned. |
| Self-extinguishing | Some plastics, like nylon, tend to self-extinguish when the flame is removed. |
| Buoyancy | Plastic generally floats better than wood due to its lower density. |
| Toxicity | Burning plastic releases pollutants like microplastics, bisphenols, and phthalates, which can be harmful to human health and the environment. |
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What You'll Learn
- Plastic generally burns faster and hotter than wood
- Some plastics burn much faster than wood, e.g. polystyrene
- Plastics have higher ignition temperatures than wood
- Plastics produce different toxic gases when burned
- Plastics are composed of carbon, hydrogen and oxygen, which burn slower than other plastics
Plastic generally burns faster and hotter than wood
Plastics that are composed of carbon, hydrogen, and oxygen burn slower than those that are not. The combustion products produced from burning plastics containing only carbon and hydrogen are the same as natural polymers such as wood, paper, and other Class A combustible materials. However, plastics containing carbon, hydrogen, and oxygen produce the same combustion products as those containing just carbon and hydrogen, with the difference being that they are less combustible.
Plastics that contain nitrogen and sulfur produce very toxic gases when they burn. Plastics containing nitrogen burn with no smell, while those with sulfur produce a choking sulfur dioxide smell. Plastics containing halogens, such as fluorine and chlorine, produce acrid, choking odors when they burn. These plastics require a continuous flame to stay lit, or they will self-extinguish. Silicone-based plastics will not burn at all.
The prevalence of synthetic materials in modern furniture and homes makes them much more flammable. Plastic toys, cleaning solvents, and TVs, for example, can accelerate fires.
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Some plastics burn much faster than wood, e.g. polystyrene
The burn rate of any material depends on various factors, including its composition, density, and specific surface area. For example, wood is a natural polymer that burns differently depending on its type. Similarly, the combustion characteristics of plastics vary based on their chemical composition and form.
Some plastics burn much faster than wood, such as polystyrene, a carbon- and hydrogen-based plastic. Polystyrene burns vigorously and faster than wood. Other plastics in this category include polyethylene and polypropylene. These plastics burn very well, and melting polyethylene produces dripping molten material that can spread the fire.
However, plastics with the same chemical composition can exhibit different burning behaviours depending on their form. For example, vinyl burns slowly in its solid form but spreads flames rapidly when used as a thin coating on wall coverings. Nylon tends to self-extinguish when removed from a flame, but it burns enthusiastically when in the form of carpet fibre.
The presence of certain chemicals in plastics can also affect their combustion characteristics. Plastics containing carbon, hydrogen, and oxygen burn slower than those with only carbon and hydrogen. Nitrogen and sulfur in plastics produce highly toxic gases when burned, and plastics with halogens (fluorine and chlorine) produce acrid, choking odours.
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Plastics have higher ignition temperatures than wood
While plastic burns hot and fast, plastics generally have higher ignition temperatures than wood and other cellulose building products. This means that, under normal circumstances, wood will burn first. However, some plastics burn much faster than wood, such as unmodified polystyrene. Furthermore, plastics as a group have very high flame spread characteristics, as high as two feet per second, or 10 times that of wood on the surface. For example, vinyl tested in solid form in a laboratory burned slowly, but when in the form of a thin coating on wall coverings, it spreads rapidly.
The combustion products produced from burning plastics containing only carbon and hydrogen are the same as natural polymers such as wood, paper, and other Class A combustible materials. Plastics containing carbon, hydrogen, and oxygen produce the same combustion products as those containing just carbon and hydrogen. However, this group of plastics tends to be less combustible than those with just carbon and hydrogen. Plastics in this group include acetal, acrylics, alyls, cellulosics, some epoxies, ethylene vinyl acetate, ionomers, phenolics, polycarbonate, polyesters, and polyphenylene oxide.
Plastics that are composed of carbon, hydrogen, and oxygen burn slower than the others. Thermosetting plastics can produce burning smells like charred wood or formaldehyde. Plastics containing nitrogen and sulfur will produce very toxic gases when they burn. Nitrogen-based plastics produce an additional product of combustion when they burn—hydrogen cyanide, an extremely toxic and flammable gas. Plastics containing the halogens fluorine and chlorine produce acrid, choking odors when they burn. With fluorine- and chlorine-based plastics, the flame must be continuous, or the plastic will self-extinguish. Almost all plastics can be made flame- or smoke-retardant by adding other chemicals during manufacturing.
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Plastics produce different toxic gases when burned
Plastic burns hotter and faster than wood. It is also used as kindling in cooking fires. Plastic has higher ignition temperatures than wood and other cellulose building products. Plastics have been reported to have very high flame spread characteristics, as high as two feet per second, or 10 times that of wood on the surface.
Plastics are composed of organic materials that are part of a group of materials known as polymers. Plastics containing carbon, hydrogen, and oxygen burn slower than the others. Thermosetting plastics can produce burning smells like charred wood or formaldehyde. When nitrogen is added to the plastic compound, an additional product of combustion occurs when it burns. This additional product is hydrogen cyanide, an extremely toxic and flammable gas. Plastics containing nitrogen burn with no smell, and those with sulfur produce a choking sulfur dioxide smell.
The burning of plastics releases toxic gases like dioxins, furans, mercury, and polychlorinated biphenyls (BCPs) into the atmosphere, posing a threat to vegetation, human, and animal health. Burning plastic also releases black carbon (soot), which contributes to climate change and air pollution. Plastic waste incineration in open fields is a major source of air pollution.
Burning household plastic waste can affect human health in many ways. It releases pollutants like microplastics, bisphenols, and phthalates—toxins that can disrupt neurodevelopment, endocrine, and reproductive functions.
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Plastics are composed of carbon, hydrogen and oxygen, which burn slower than other plastics
Plastics are derived from crude oil, natural gas, coal, or renewable products such as carbohydrates, fats, and oils. They are composed of organic materials that are part of a group of materials known as polymers. Polymers are further subdivided into two groups: naturally occurring and man-made. Plastics contain various elements, including carbon, hydrogen, oxygen, nitrogen, sulphur, and chlorine.
Plastics that are composed of carbon, hydrogen, and oxygen burn slower than other plastics. For instance, vinyl, when tested in solid form, has been shown to burn slowly. However, when in the form of a thin coating on wall coverings, it spreads rapidly and contributes to flame spread. Similarly, nylon has a tendency to self-extinguish when a flame is removed. When nylon is in the form of carpet fiber under certain conditions, it burns with great enthusiasm. Examples of carbon- and hydrogen-based plastics include polyethylene, polypropylene, and polystyrene.
The combustion products produced from burning plastics containing carbon and hydrogen are the same as natural polymers such as wood, paper, and other Class A combustible materials. Plastics containing carbon, hydrogen, and oxygen produce the same combustion products as those containing just carbon and hydrogen. The major difference is that plastics with carbon, hydrogen, and oxygen are less combustible as a group than those with just carbon and hydrogen. Plastics in this group include acetal, acrylics, alyls, cellulosics, some epoxies, ethylene vinyl acetate, ionomers, phenolics, polycarbonate, polyesters, and polyphenylene oxide.
Plastics that contain nitrogen and sulfur produce very toxic gases when they burn. Plastics containing nitrogen burn with no smell, whereas those with sulfur produce a choking sulfur dioxide smell. Plastics that contain halogens (fluorine and chlorine) produce acrid, choking odors when they burn. Almost all plastics can be made flame or smoke retardant by adding other chemicals during manufacturing.
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Frequently asked questions
Plastic generally burns hotter and faster than wood. However, the type of plastic and wood can impact their respective burning properties. For example, plastics composed of carbon, hydrogen, and oxygen burn slower than plastics composed of other materials.
Plastic has a higher ignition temperature and flame spread characteristics than wood. This means that plastic can ignite at a higher temperature and spread the flame more quickly, at a rate of up to two feet per second, or 10 times that of wood.
Burning plastic can release toxic pollutants such as microplastics, bisphenols, and phthalates, and nitrogen and sulfur oxides, which can have negative effects on human health and the environment.
Some examples of plastics that burn faster than wood include unmodified polystyrene, vinyl, and polyurethane foam without a flame retardant.
Plastic is less dense than wood, which means it floats better. This can be useful in certain applications, such as in water displacement.
