Maya Ellison
The plastic industry involves the global production, compounding, conversion, and sale of plastic products. It is a secondary industry that uses raw materials extracted from natural resources in the primary sector to create finished products. Plastics are synthetic or semisynthetic materials composed primarily of polymers, and their adaptability, durability, flexibility, and low cost have led to their widespread use. The plastic industry is expected to grow due to rising demand in construction, automotive, and electrical and electronics industries, but environmental concerns regarding disposal and sustainability are also prompting regulatory challenges.
| Characteristics | Values |
|---|---|
| Definition | The plastic industry includes the global production, compounding, conversion, and sale of plastic products. |
| Raw Materials | Most plastics are produced from natural gas, petroleum, and petrochemicals. A minority are produced from renewable resources like polylactic acid, cellulose, and starch. |
| Primary Industry | Getting wood from forests is a primary industry. |
| Secondary Industry | Making furniture from wood is a secondary industry. |
| Plastic Industry as a Secondary Industry | The plastic industry uses raw materials and converts them into finished products. |
| Examples of Secondary Industry | Manufacturing and construction industries. |
| Global Plastic Industry Market | Expected to grow steadily from 2019-2025 due to rising demand in construction, automotive, electrical and electronics industries. |
| Environmental Impact | The slow decomposition rate of plastics in natural ecosystems has led to widespread environmental concerns. |
| Sustainable Alternatives | Metal and bioplastics are alternative materials that can limit the market share of engineering plastics. |
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What You'll Learn
The plastic industry is a secondary industry
The plastic industry includes the global production, compounding, conversion, and sale of plastic products. Plastic is a synthetic or semisynthetic material composed primarily of polymers, which give them their defining characteristic of plasticity. This allows plastics to be molded, extruded, or pressed into a diverse range of solid forms.
The plastic industry uses raw materials such as natural gas, petroleum, and renewable resources like cellulose, starch, and polylactic acid to produce plastic products. These plastic products are then sold to various industries, including packaging, construction, electrical and electronics, automotive, and medical devices.
The plastic industry is a global business, with the Middle East and Russia producing most of the required petrochemical raw materials, while the production of plastic is concentrated in the global East and West. The demand for plastics is rising, particularly in emerging economies such as Brazil, China, India, and Mexico, due to the expansion of the construction industry.
However, the plastic industry also faces challenges due to increasing environmental concerns related to plastic disposal and sustainability issues. There is a growing trend towards alternative materials, such as metal and bioplastics, and a shift towards bio-based plastics as consumers and manufacturers seek more sustainable options.
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Primary industries produce natural resources
The primary industry deals with the extraction and production of natural resources. These industries produce or create products that are sold to the public. For example, workers in the primary industry, such as hunters, farmers, coal miners, etc., are involved in activities like farming, mining, fishing, forestry, agriculture, crop production, and animal husbandry.
The primary industry serves as the foundation for all other items and is often referred to as the "agriculture and allied sector". This is because agriculture, dairy, forestry, and fishing provide the majority of the natural items we consume. These industries are also known as "economic drivers" of a region, as they generate income that flows into the local economy. For instance, the mining sector extracts raw materials such as coal or minerals and sells them to markets outside their location, bringing in proceeds that support employment and investment.
The primary sector of the economy includes any industry involved in the extraction and production of raw materials. This includes industries such as farming, logging, fishing, forestry, and mining. In developing countries, the primary sector tends to make up a larger portion of the economy, while in developed countries, it becomes a smaller percentage of the workforce. This is because developed economies have become more technologically advanced, enabling the mechanization of industries like farming.
The primary industry is further divided into two categories: the extractive industry and the genetic industry. The extractive industry involves the extraction of products from natural resources and the manufacturing of finite raw materials that cannot be replenished through cultivation. The genetic industry, on the other hand, involves the rearing and breeding of living species like birds and plants, developing and improving raw materials through human involvement in the production process.
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Plastic production involves conversion
The plastic industry is a secondary industry. Secondary industries use raw materials extracted from the primary sector and convert them into finished products.
Plastic production involves the conversion of crude oil into plastic. Crude oil is a complex mixture of thousands of compounds and needs to be processed before it can be used. The production of plastics begins with the distillation of crude oil in an oil refinery. This separates the heavy crude oil into groups of lighter components, called fractions. Each fraction is a mixture of hydrocarbon chains (chemical compounds made up of carbon and hydrogen), which differ in terms of the size and structure of their molecules. One of these fractions, naphtha, is the crucial compound for the production of plastics.
Two main processes are used to produce plastics: polymerisation and polycondensation. Both require specific catalysts. In a polymerisation reactor, monomers such as ethylene and propylene are linked together to form long polymer chains. This process involves heating the plastic to anywhere between 150–320 °C (300–610 °F). Molten plastic is viscous and exhibits laminar flow, leading to poor mixing. Compounding is therefore done using extrusion equipment, which is able to supply the necessary heat and mixing to give a properly dispersed product.
The compounding stage involves melt-blending various blends of materials to make formulations for plastics. Generally, an extruder of some type is used for this purpose, followed by pelletising the mixture. Extrusion or a different moulding process then transforms these pellets into a finished or semi-finished product. Large companies may do their own compounding prior to production, but some producers have it done by a third party. Companies that specialize in this work are known as compounders.
There are several methods to convert plastic into a finished product, including blow moulding, rotational moulding, casting, film blowing, spinning, and 3D printing.
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Plastic is used in construction
The plastics industry can be considered a secondary industry. Secondary industries use raw materials extracted from the primary sector and convert them into finished products. The primary sector includes industries such as farming, mining, fishing, forestry, and agriculture. On the other hand, secondary industries consist of construction and manufacturing industries.
Plastic is used extensively in the construction industry due to its versatility, strength, durability, corrosion resistance, and cost-effectiveness. Here are some specific ways in which plastic is used in construction:
Pipes and Conduits
Plastic pipes are used for rainwater, sewage, gas distribution, and organizing wires. Piping and conduits are the largest users of polymers in construction and consume about 35% of plastic production.
Insulation
Plastic is commonly used for insulation in construction. Polystyrene rigid foam insulation is lightweight, strong, and easy to install. It helps contractors meet energy conservation regulations.
Seals, Gaskets, and Weather Strips
Seals and gaskets are often made from elastomers, a type of plastic. They are used in weather strips, aperture seals, expansion joints, and as a membrane for roofing and linings.
Flooring and Roofing
Plastic is used in flooring and roofing materials. It can be formed into sheets, panels, or coverings, providing a lightweight and durable alternative to traditional materials.
Doors, Windows, and Skylights
Doors, window panels, and skylights can also be made of plastic. Plastic windows offer better insulation and are more durable than traditional glass windows.
Hardware
Plastic is used for various hardware components such as washers, nuts, bolts, and other construction hardware.
Cable Insulation
Plastic is commonly used for cable insulation and insulating tape in electrical applications.
While plastic has many advantages in construction, there are also some disadvantages and environmental concerns. Plastic has a high embodied energy content, is generally unsuitable for load-bearing applications, and can be difficult to recycle. Additionally, untreated plastics are ignitable and have a high thermal expansion rate.
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Environmental concerns affect the plastic industry
The plastic industry is considered a secondary industry. Secondary industries use raw materials extracted from the primary sector and convert them into finished products.
Environmental concerns have significantly impacted the plastic industry. Plastic pollution has become one of the most pressing environmental issues, with single-use plastics accounting for 40% of the plastic produced annually. These products, such as plastic bags and food wrappers, are used briefly but can persist in the environment for hundreds of years.
The issue of plastic pollution is evident in developing Asian and African nations, where garbage collection systems are often inadequate or non-existent. However, developed countries, particularly those with low recycling rates, also struggle to manage plastic waste effectively. Plastic waste has become so pervasive that efforts are being made to create a global treaty to address the issue.
Plastics have had a detrimental impact on marine life, with millions of animals dying each year from ingestion, entanglement, or starvation due to plastic debris. Nearly 2,100 species, including endangered ones, are affected by plastics, and plastic pollution poses a risk to marine ecosystems and their ability to adapt to climate change. Microplastics, which can originate from primary or secondary manufacturing, are of particular concern. They are found in every ecosystem, from the Antarctic tundra to coral reefs, and have been detected in various food sources.
The production and conversion of fossil fuels into plastic products contribute to greenhouse gas emissions, with the plastic industry projected to account for a significant portion of global oil consumption and carbon emissions by 2050. The environmental impact of the plastic industry has led to calls for behavioural changes and interventions to reduce plastic pollution and its associated risks.
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Frequently asked questions
A primary industry produces or creates products that are sold to the public. It revolves around the natural resources available on Earth. Examples include farming, mining, fishing, forestry, agriculture, crop production, and animal husbandry.
No, the plastics industry is not a primary industry. It is a secondary industry.
A secondary industry uses the raw materials extracted in the primary sector and then converts them into finished products. Examples include the construction and manufacturing industries.
