What are biodegradable cups made of?
In the current fight against plastic pollution, biodegradable cups have emerged as a responsible solution. Unlike conventional petroleum-based cups, which can take centuries to break down, a biodegradable product is designed to decompose naturally through the action of micro-organisms, without leaving toxic residues.
If you are looking for an option that combines functionality and respect for the environment, one of the best alternatives is to choose disposable paper cups, which offer a good balance between strength and sustainability.
Biodegradable cups are mainly made from plant-based materials such as polylactic acid (PLA), sugar cane bagasse or paper with biodegradable coatings. These materials allow the cup to decompose naturally without generating polluting waste.
What materials are biodegradable cups made of?
The sustainable packaging industry has evolved thanks to the use of organic, renewable raw materials. These materials do not just hold liquids: they also ensure a more responsible life cycle.
The most common materials are:
- PLA (polylactic acid) : derived from corn, sugar cane or cassava
- Sugar cane bagasse : a tough, compostable plant fibre
- Paper with a biodegradable coating : an alternative to traditional plastic
- Other materials : such as PHA or potato starch
Polylactic acid (PLA)
PLA is one of the most innovative materials in this sector. It is a transparent, rigid biopolymer obtained by fermenting plant sugars, mainly from corn starch, cassava or sugar cane. Its appearance is almost identical to that of traditional plastic, but with a much lower carbon footprint and the possibility of being industrially composted.
Bagasse: sugar cane fibre
Bagasse is the fibrous residue left after the juice has been extracted from sugar cane. Instead of being thrown away, it is processed to create very sturdy cups and containers. Suitable for both cold and hot drinks, it offers a natural texture much appreciated by eco-conscious consumers.
Paper with a biodegradable coating
Many paper cups look eco-friendly, but they often contain a thin layer of polyethylene (plastic) to prevent leaks. True biodegradable cups replace this layer with PLA or other plant-based bioplastics. The cup thus stays watertight without compromising its ability to decompose.
Other plant-based materials
In addition to the above, there are innovations such as:
- PHA (polyhydroxyalkanoates) : biopolymers produced by bacterial fermentation, suited to a wider range of composting conditions.
- Potato starch : often used in blends to add density and mechanical strength to containers.
How are biodegradable cups made?
The manufacturing process varies depending on the material. For PLA, the starch is converted into dextrose, fermented into lactic acid, then polymerised to create pellets that are injection moulded or thermoformed.
For cups made from natural fibres (bagasse or cellulose), the fibres are mixed with water to create a pulp that is poured into moulds under high pressure and heat, which evaporates the moisture and produces a solid, durable container.
Biodegradable vs compostable: what is the difference?
These terms are often confused, but there is a key nuance:
- Biodegradable : the material breaks down naturally through the action of micro-organisms, over an indeterminate period (but much shorter than that of plastic).
- Compostable : the material does not simply break down, it does so within a specific timeframe and under controlled conditions (such as in a composting facility), becoming an organic fertiliser without leaving microplastics or heavy metals.
Benefits of biodegradable cups
- Waste reduction: they greatly reduce the accumulation of waste in landfills and oceans.
- Energy savings: their production generally requires less energy and generates less CO₂ than fossil-based plastic.
- Brand image: they reflect a genuine commitment to the environment, which customers greatly appreciate.
- Food safety: being plant-based, they are free from bisphenol A (BPA) and phthalates.
What to check before choosing your biodegradable cups
Before buying, take these key points into account:
- Intended use: standard PLA is ideal for cold drinks, as it can deform above 40 °C. For coffee or hot tea, choose paper with a biodegradable coating or bagasse.
- Certifications: look for labels such as EN 13432, which guarantee that the product is genuinely compostable.
- Waste management: make sure you have suitable bins (generally the food waste bin) so that the cups can properly complete their life cycle.
Besides the material, it is essential to consider thermal safety. Many people wonder, for example, whether a paper cup can be put in the microwave: some biodegradable coatings, such as PLA, do not withstand high temperatures.
Frequently asked questions about biodegradable cups
How long does it take for a biodegradable cup to decompose?
It depends on the material. PLA or bagasse cups can decompose within a few months under industrial composting conditions, whereas in nature the process can take longer.
Can biodegradable cups be recycled?
In general, they should not be put in the standard recycling bin. It is preferable to place them in the food waste bin or in composting facilities, provided the product is certified compostable.
Are they safe for hot drinks?
It depends on the material. Bagasse cups and paper cups with a biodegradable coating are suitable for hot drinks, whereas PLA cups are mainly designed for cold drinks, as they can deform at high temperatures.
Do biodegradable cups pollute less than plastic cups?
Yes, their environmental impact is lower, because they are made from renewable materials and can decompose without generating toxic waste or microplastics if properly managed.
What certifications should biodegradable cups have?
One of the most important in Europe is the standard EN 13432, which guarantees that the product is compostable and meets biodegradation requirements under controlled conditions.
Conclusion
The right cup depends on your drinks, your way of serving and the sorting system available. Discover the Covr catalogue to find disposable cups suited to your establishment, or contact us for advice.
