From the bathroom to outer space: where the silicones D4, D5 and D6 live

Quiet helpers of everyday life

Picture the morning: a shampoo that leaves your hair silky, a cream that spreads easily, a deodorant that gives a feeling of freshness.

Then a car whose engine runs reliably, a laptop that doesn’t overheat and a phone that is always at hand.

All of this has one thing in common: the cyclosiloxanes D4, D5 and D6 – silicone substances that have been making our lives more comfortable for decades.

Why have they become a problem?

D4, D5 and D6 have unique properties: they provide a smooth texture, stability and temperature resistance.

But precisely because of this, they also pose an environmental challenge:

• they are persistent – they break down slowly in nature
• bioaccumulative – they build up in organisms
• toxic – particularly harmful to aquatic ecosystems

👉 What we use in Belgrade can end up in Arctic waters.

New EU rules

The European Union has responded by adopting comprehensive restrictions. The most important deadlines are:

• From 2026 – restrictions in industrial products (adhesives, sealants, coatings, 3D printing)
• From 2027 – a restriction in cosmetics (“leave-on” products) to ≤0.1%
• From 2031 – a restriction in medical devices to ≤0.1%

📊 ECHA estimates that these measures will cut emissions of these substances by up to 90% – one of the biggest regulatory shifts of the past decade.

What does this mean for industry?

These changes have serious consequences for manufacturers:

• formulations will have to change
• investment in new technologies and research will be needed
• costs will rise because alternatives are not always available
• product performance may be different (texture, scent, feel on the skin)

Impact on consumers

For consumers, the changes may seem subtle – a different shampoo texture or the scent of a cream.

But in the long run, this means:

• cleaner rivers and seas
• safer ecosystems
• lower risk to human health and the environment

A global perspective

Although the restrictions are currently limited to the EU, it is worth noting that the nomination of D4/D5/D6 under the Stockholm Convention was also considered – which would mean global bans.

That proposal has been rejected for now, but industry must reckon with further regulatory escalation.

What should companies do?

If you do business on the EU market – whether by exporting finished products or by using EU components – the time to act is now:

• Map the products and processes where D4/D5/D6 are used.
• Track the deadlines and new limits.
• Develop a plan for switching to alternative substances and technologies.
• Inform consumers and partners about the changes – transparency is becoming the key to trust.

Conclusion

The restrictions on D4, D5 and D6 are only the first wave. The chemical industry is entering an era in which sustainability is no longer an option but an obligation.

For companies that plan ahead – this is an opportunity to lead the transition to “cleaner chemistry”. For those that wait – the risk is clear: lost markets and a regulatory trap.

If your company is looking for support in analysing products and planning compliance with EU regulations, Vetren can help you.