📋 In this article
An ANSES study reveals that drinks packaged in glass bottles contain up to 100 microplastic particles per litre, which is 50 times more than in aluminium cans.
We often choose glass for its purity, but the abrasion of polyester coatings on metal caps silently contaminates our soft drinks and beers. We’ll analyse the source of these residues and present the best filtration solutions to protect your gut health every day.
Microplastics in glass bottles: an unexpected finding 🧪
A study by ANSES reveals that glass bottles contain up to 100 microplastic particles per litre, which is 50 times more than cans, due to the abrasion of painted metal caps.
Let’s now look at the details of this study, which is shaking up our consumption habits and our trust in glass.
Figures that challenge our assumptions about glass
ANSES recently published a study on industrial beverages. The results are surprising: glass is not as pure as we think.
Researchers measured around 100 plastic particles per litre in soft drinks and beers. This concentration far exceeds expectations. Yet we used to think that the inertness of glass protected our drinks.
There is therefore a real paradox. Glass retains its wholesome image. Yet laboratory analyses prove that our favourite drinks are actually contaminated with microplastics.
Why glass is no longer a complete refuge from plastic
When comparing containers, the findings are clear-cut. Glass can harbour 50 times more residues than aluminium cans. This comes as a shock to informed consumers.
However, mineral water seems less affected by this phenomenon. The migration of particles appears to be more intense in fizzy drinks than in still water.
| Type of container | Average concentration |
|---|---|
| Glass bottle | 100 parts per litre |
| Plastic bottle | 20 parts per litre |
| Aluminium can | 2 parts per litre |
To minimise risks in your home, using a Brita Glass filter allows you to filter your water whilst enjoying the neutrality of a high-quality glass jug.
Cap abrasion: the hidden source of contamination
Whilst the glass itself is inert, the problem actually stems from its mechanical closure system and the finishes applied to the caps.
The unexpected culprit: the paint on metal caps
The internal paint on the caps plays a key role. It contains specific polymers, often including polyester and polyolefins.
Industrial sealing causes particles to detach. The pressure exerted then weakens the coatings. These micro-residues end up directly in your drink.
The abrasion of the internal coating of metal caps is the main source of microplastics being released into the liquid.
The role of storage and mechanical friction
Transport generates constant friction. These repeated vibrations between the cap and the neck of the bottle are harmful. They create scratches invisible to the naked eye.
Prolonged storage exacerbates the release of particles. The longer the time, the more the polymers settle. This increases the risk to your health.
ℹ️ Key data from ANSES
The polymers identified are mainly polyester and polyolefins (polyethylene, polypropylene) from the internal coating.
Wear and tear on seals also releases micro-fragments. As they degrade, they directly contaminate the liquid contents.
Health impact and beverages most at risk
This contamination is not uniform and varies drastically depending on the type of liquid consumed, raising legitimate concerns about our health.
Beers, soft drinks and teas: the contamination rankings
Soft drinks, lemonades and industrial beers have record levels of particles. However, wine seems largely unaffected by this phenomenon. This difference can be explained by specific bottling methods.
Acidity and carbonation play a major role in this transfer. Carbon dioxide increases the pressure on the metal cap. This promotes the erosion of the internal coatings during storage.
| Drink | Contamination rate | Probable cause |
|---|---|---|
| Soda | High | Cap paint |
| Beer | High | Rubbing of caps |
| Mineral water | Low | Inert material |
| Wine | Low | Specific process |
What are the real risks to your body?
Chronic ingestion of these polymers could trigger inflammatory responses. According to certain scientific hypotheses, these particles may disrupt the intestinal barrier. We are closely monitoring these concerning studies.
The toxicity of chemical additives remains a major concern for us. The government has, in fact, stated in a response to the Senate that there is currently a lack of reference toxicological data.
The standardisation of global testing is now an absolute priority. Without strict standards, accurately quantifying the actual health risk remains complex. Yet your health deserves complete transparency.
How can you filter your water to avoid ingesting polymers?
In light of this industrial reality, solutions exist both at the production level and in your own kitchen.
Industrial solutions to clean up production
Rinsing the capsules reduces particles. The use of compressed air is also effective. These simple steps in the factory drastically reduce residues.
Changing the coating materials is necessary. Using varnishes without unstable polymers helps a great deal. This is a serious avenue for bottlers to explore.
European regulations must evolve rapidly. A strict standard for containers is becoming a priority. This is a major public health issue.
📋 Recommended industrial measures
- Blowing air onto the caps
- Rinsing before final sealing
- Modification of paint composition
- Optimising storage to minimise friction
Why domestic filtration remains your best ally
Use high-performance gravity filters. Reverse osmosis also removes fine particles. Here is the best gravity filter currently available.
Filtered tap water offers real benefits. It helps avoid microplastics associated with transport. There’s no need for prolonged storage in bottles.
Opt for stainless steel water bottles when you’re on the go. Check out this review of the Geekpure osmosis system for maximum purity. Your health deserves this protection.
An ANSES study reveals that abrasion of bottle caps contaminates your drinks, sometimes making glass more contaminated than plastic. To protect your health, rinse your bottle necks or opt for an effective home filtration system. Start purifying your daily life now for a future free from microplastic residues in your glass bottles.