PVC is one of the most widely produced synthetic plastics in the world. The material is known for its long lifespan and broad versatility. You will find PVC on a large scale in the construction sector—think of sewage pipes, window frames, cables, and flooring—as well as in packaging such as blister packs for medicine and consumer goods.
Properties: pros and cons
The properties of PVC make it a popular material for long-term applications:
- Advantages: PVC is exceptionally strong, durable in use, flame-retardant, and highly resistant to chemicals, moisture, and wear and tear.
- Disadvantages: In its pure form, PVC is very hard and brittle. To make it flexible, additives and plasticisers are often required. Additionally, harmful substances such as hydrogen chloride can be released during incineration.
The environmental impact of PVC
To determine the precise environmental impact, we look at a comparative Life Cycle Assessment (LCA) of 1 kg of PVC versus 1 kg of PET. This shows that the environmental performance varies significantly depending on the impact category.
In terms of climate change, PVC scores relatively favourably compared to PET: emissions amount to 2.55 kg CO₂-eq per kg, compared to 3.50 kg CO₂-eq for PET. PVC also has a lower impact in categories such as land use (1.97 Pt for PVC vs 2.52 Pt for PET). On the other hand, PVC scores considerably worse in impact categories such as water consumption (1.02 m³ vs 0.68 m³ for PET), freshwater ecotoxicity, and human toxicity. This demonstrates that looking at CO₂ emissions alone gives an incomplete picture of the overall environmental burden.
Recycling PVC
Although PVC has a long lifespan, processing it in the waste phase remains a major challenge.
- Complex composition: Unlike a pure plastic such as PET, PVC often contains diverse additives (such as plasticisers and stabilisers). This makes sorting and mechanical recycling a complicated process.
- Recycling rate: Approximately 24% of all PVC waste in Europe is actually recycled. This percentage is significantly lower than for PET (around 85%), mainly because PVC is widely used in long-lasting construction materials and due to its challenging chemical composition.
Conclusion
Due to its strength, chemical resistance, and long service life, PVC is a functional material, particularly for the construction and infrastructure sectors. LCA results show that CO₂ emissions during production are lower than those of PET, but that PVC scores higher on environmental impacts such as water consumption and toxicity. Owing to its complex composition with additives, PVC recycling continues to lag behind. Increasing collection and processing capacity is therefore essential to align PVC with the circular economy.
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