Recently, models on the fate of tyre wear particles (TWPs) have estimated that 18% of TWP emissions are transported from roads to freshwater bodies and approximately 2% are led out to estuaries and then marine habitats. What then happens to the remaining 16% of TWP emissions left in the freshwater compartment is not yet clear

The presence of tyre wear particles (TWP) in the aquatic environment is considered an emerging contaminant, and one that has gained increasing interest during the past few years. Although the presence of TWPs in the environment is given greater attention these days, TWPs have probably been present since the dawn of the pneumatic car tyre production in the late 19th century. The first scientific report of tyre dust identification along a roadside was published in 1961. Different perspectives have since been applied to this field of research and almost decade by decade shifted foci from degradation patterns to heavy metal release, to impacts of scrap tyres on the aquatic environment and leaching of chemicals from tyres. More recently, research within this field has been directed towards repurposing scenarios using crumb rubber in turf fields and playground material. Finally, in the 2010s, micronised tyre rubber has become grouped with other polymer debris and hence become part of the polymer landscape usually referred to as ‘microplastics.’ TWPs are considered to represent the majority of microplastics (or polymer debris) in the environment, and the newest calculation on the wear of tyres is estimated at 0.81 kg per person per year.

Now, looking at TWPs through the lens of microplastic pollution, research and information from the microplastics field are very well applicable to TWPs in many instances. With this new perspective of TWPs, increasing awareness of possible adverse effects in the environment follows - how do TWPs distribute in the different environmental compartments (soil, air, sediment, water and biota (living organisms)) and how do TWPs behave when exposed to different abiotic factors in these environmental compartments. For example, UV-radiation or pH, temperature and salinity differences could affect TWPs, but to what degree? A recent paper on this very subject concluded that particularly temperature and mechanical stress could influence the toxicity of TWPs. The focus of tyre production and function have seemingly always been directed towards maximising the three hallmarks: grip, wear and rolling resistance, and rightfully so, but somewhere along the road we forgot to consider where tyre abrasion actually disappears to. Luckily, some scientists already thought of this and today we can begin to lay the foundation to our collected TWP knowledge, based on the available scientific literature.

From roads to water

Research shows that the minority of TWPs end up in the airborne fraction (0.1-10%) and recently TRWPs have been assessed to contribute a low risk to human health in the particulate matter (PM) PM2.5 and PM10 range. So, where to find the remaining 90.0-99.9% of tyre debris emissions? Early research on particulate distribution showed a decreasing concentration of TWPs with increasing distance from the road. From there, TWPs are expected to wash off during rainfalls, transporting them to different environmental compartments. Recently, models on the fate of TWPs have estimated that 18% of TWP emissions are transported from roads to freshwater bodies and approximately 2% are led out to estuaries and then marine habitats. What then happens to the remaining 16% of TWP emissions left in the freshwater compartment is not yet clear and more research is needed to answer this question.

Aquatic organisms living in the water column or the sediment can interact with TWPs in their natural habitats during this particle transportation through freshwater to the marine environment. Although there are no scientific references on field observations of TWP ingestion by aquatic biota yet, few recent observations of this behaviour under controlled laboratory settings have been reported. In 2009 the first observation of the water flea, Daphnia magna, ingesting TWPs was described in the scientific literature and only two years ago the first photos were published showing ingestion of TWPs in the benthic amphipod Gammarus pulex following sediment exposure. Shortly thereafter photos of TWP ingestion in the amphipod Hyalella azteca and opossum shrimps from the mysidae family followed after water-only exposures, and most recently freshwater and marine fish species have been documented ingesting TWPs under laboratory conditions.

The recent focus on particulate effects of TWPs on biota is still in its infancy and the latest development in this field investigates the possible effects of both the particulate fraction and the leachate fraction. The leachate fraction is the suite of chemicals that leach out from TWPs to the surrounding water. Previously, tyre toxicity investigations in the aquatic environment revolved solely around the leachate fraction, which has been the primary focus over the last 30 years. Among the first papers the effect of whole tyre leachate was investigated showing worn tyre leachate to exhibit greater toxicity than leachate from a pristine tyre to rainbow trout. Furthermore, decreasing toxicity was observed with increasing salinity indicating that salinity either influences the leachability of toxic constituents or that an interaction of salts and toxic chemicals is present. Exposure of shredded tyre chips to different bacteria likewise showed a correlation between decreasing toxicity and increasing salinity, concluding that tyre leachate is likely to be a greater threat to freshwater habitats than to estuarine or marine habitats.

Toxicity pattern

Further testing of TWPs and leachate on a freshwater species recently showed a dissimilar toxicity pattern when comparing acute toxicity responses of TWPs or leachate. Here, the amphipod H. azteca was exposed to either TWPs in freshwater or the leachate fraction alone, i.e. with no particulates present. This showed that leachate was more toxic in lower concentrations, presumably because dissolved chemicals are more bioavailable. Although, at higher concentrations, the particle fraction of TWPs became more toxic. This phenomenon very well describes the complexity and discrepancies when working with TWPs in the aquatic environment. It is not just a question of determining toxicity of a single chemical under controlled settings, but rather investigating a mixture of many chemicals in changing ambient environments. This complex matrix of polymer and chemicals can be more or less bound to the particle, which in itself might have adverse effects. However, the particle could also function as a vessel, containing chemicals and making them more or less bioavailable depending on the surrounding environment. Discovering exactly which chemicals leach out under different exposure scenarios, and most importantly, what of that is actually bioavailable to aquatic living species is the more interesting question to answer.

Due to the amorphous nature of rubber, end-of-life tyres (ELTs) have been used as leachate collection material and been used to collect polycyclic aromatic hydrocarbons (PAHs) and metals from contaminated waters. This discrepancy between the different TWP uses that in some cases could deem toxic and have adverse effects but at the same time might serve to mitigate other environmental issues is a great conflict of contradictory traits. Now, we need to unravel exactly when these contradictory traits are possibly affecting aquatic environments negatively and when these traits might be used for our advantage.

So how do scientists quantify TWPs and chemical constituents or ‘biomarkers’ from TWP leachate in water? The quick answer is that no tried and tested procedure is more right than any other now, we simply do not have conformity or guidelines on how to do this. Especially when looking to find particulates from tyre debris, as this is not usually detected when investigating for other polymer debris e.g. microplastics. Therefore, it is expected that the total amount of microplastics has been underestimated due to the lack of data from TWPs, which make up a large part of the estimated microplastic load worldwide and have not been reported on a regular basis. A multitude of methods have been used to estimate TWP emissions by measuring the concentration of chemicals in samples, with more or less success over the years. The biomarkers that have been used to determine TWP concentration most successfully include quantification of benzothiazoles and zinc. Both chemicals are used as part of the vulcanisation process and are also ubiquitous in nature. They are used for manufacturing of other materials, but specific versions can be attributed mainly to tyre manufacturing and are thus the most reliable compounds to measure.

How this emerging field of tyre ecotoxicology will progress ultimately depends on cooperation between different stakeholders having a common goal to pursue. The one thing that we can probably all agree on, is the need for tyres and other rubber products in our society. How we then fill that need, and what future decisions we make to maximise our understanding of the possible negative implications of TWPs in the aquatic environment is of paramount importance. Our job now is to continue our research within this field and ultimately prevent excess and unnecessary pollution of the water bodies that we all depend on, in a manner that stays true to both the environment and our need for safe and reliable tyres. 

*The author is a PhD student in Environmental Biology at Roskilde University, Department of Natural Science and Environment, Denmark, with funds from Danish Environmental Analysis

References

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Himadri Speciality Chemical Ltd. has been named ‘India’s Leading ESG Entity’ by Dun & Bradstreet in its report, ‘ESG Horizons: Now and Next 2026’. The honour acknowledges how deeply the company has woven environmental, social and governance considerations into its main business approach. By focusing on clean technologies and building out the lithium-ion battery value chain, Himadri proves that responsible manufacturing and sustainable expansion go hand in hand.

Dun & Bradstreet arrived at this decision using its own ESG Intelligence Framework Rating, which looked closely at the company’s performance during FY25 across key environmental, social and governance indicators. Winning this distinction shows how consistently Himadri works to generate lasting value for everyone connected to the business while keeping industrial practices responsible. Anurag Choudhary, CMD and CEO, Himadri Speciality Chemical, has explained that ESG thinking drives their innovation efforts from the ground up. Through breakthroughs in advanced materials and battery technology, the firm actively pushes forward the global movement towards a cleaner economy.

Several real-world achievements back up Himadri’s reputation for sustainability leadership. All eight of its manufacturing sites operate on a zero-liquid discharge basis. The company generates enough clean power internally to cover 100 percent of its electrical energy needs. Beyond environmental measures, Himadri has also built a strong global presence, supplying specialised chemical solutions to clients spread across 56 different countries.

A business model rooted heavily in research and development along with circular use of resources allows Himadri to keep sustainability at the centre of its growth story. By integrating these principles rather than treating them as an afterthought, the company ensures its long-term impact on both industry and the environment remains positive.

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How Dr Gerard Nijman de-mystified the ‘black magic’ of tyre engineering.

In the high-stakes, multi-billion-dollar world of automotive engineering, where the screeching captures the headlines, Dr Gerard Nijman focuses on the quiet, molecular drama happening just inches from the asphalt. To the uninitiated, a tyre is a simple black circle of rubber. To Nijman, it is a visco-elastic masterpiece, a complex soup of polymers, fillers and oils that behaves according to laws of physics that many in the industry once dismissed as ‘black magic’.

Recently, the Rubber Division of the American Chemical Society announced Dr Nijman as the recipient of the Fernley H. Banbury Award. It is one of the highest honours in the field, a recognition of a lifetime spent bridging the gap between the ‘black magic’ of the factory floor and the cold precision of laboratory rheology.

Now, two months after it was announced, I feel proud of being awarded and it is an acknowledgement of my contributions to rubber processing,” Dr Nijman says, reflecting on a career that has spanned nearly four decades. “However, if I consider the enormous lineup of previous winners, I still cannot realise that I am a part of it... I am probably still too humble to really enjoy it.”

THE FRIDAY EVENING CALL THAT CHANGED EVERYTHING

Dr Nijman’s journey into the world of elastomers didn’t begin with a lifelong passion for tyres, but rather with a fortuitous interruption. In 1987, he was deep into a PhD project focusing on molecular orientation in injection-moulded products. His trajectory seemed set for a traditional academic or specialised research path until a Friday evening phone call changed his life.

The caller was the P&O Manager of Vredestein, the Dutch tyre manufacturer. He was looking for a process engineer, specifically someone who understood the complexities of extrusion. For Dr Nijman, it was an opportunity to apply his theoretical knowledge to a massive industrial scale without abandoning his roots.

“For this position, I did not really have to leave my comfort zone, so I decided to join Vredestein on a 50 percent basis while I completed my PhD project,” Dr Nijman recalls. At the time, the industry’s understanding of material flow was rudimentary. The ‘gold standard’ was the Mooney viscosity test – a simple measurement that Nijman knew was insufficient for the high-speed, high-heat world of modern manufacturing.

“I was fascinated by rheology and especially how the material morphology was related to the processing behaviour. At Vredestein, the common understanding of Rheology was ‘Mooney viscosity’, but somehow, I could make them clear that understanding processing means that one must understand the (thermo-)rheological behaviour and morphological characteristics of rubber compound in much more detail,” he says.

SEEING THROUGH ‘SCIENTIFIC GLASSES’

Dr Nijman attributes much of his success to a trio of mentors who helped him synthesise his disparate skills. His PhD supervisor, Prof Ingen Housz, taught him the fundamental skill of ‘looking at industrial processes through scientific glasses’. It was this ability to analyse a complex, messy industrial problem until the root cause was exposed that set Dr Nijman apart.

At Vredestein, his first boss, Albert Dijks, built his confidence by handing him immense responsibility early on. Meanwhile, Kees Hettema taught him the art of the deal – how to negotiate with customers – and Matthias Sieverding of KraussMaffei Berstorff eventually gave him the reins to lead an entire business unit.

“What I learned from all of them is that, while believing in what you are doing, you should not be afraid of answering difficult questions from your stakeholders,” Dr Nijman notes. This philosophy allowed him to navigate the friction that often exists when a scientist tries to tell a factory veteran that their decades-old ‘gut feeling’ might be wrong.

BREAKING THE SPELL OF ‘BLACK MAGIC’

In the 1980s and 90s, rubber manufacturing was often viewed as more art than science. When a production line ran into trouble, solutions were often found through trial and error. “Suddenly, problems were solved without really knowing why,” Dr Nijman explains. “It was commonly called ‘black magic’.”

Dr Nijman became one of the first engineers to replace that magic with math. He realised that the complex technological hurdles of the industry – irregular shrinkage, surface defects and inconsistent quality – could be solved through a rigorous rheological approach.

His most transformative moment came during the ‘Green Tyre’ revolution of the early 90s. Michelin had just introduced silica-based compounds, which offered lower rolling resistance and better wet grip. While industry giants like Goodyear were still scrambling to adapt, the smaller Vredestein successfully implemented the technology.

The secret weapon was Nijman’s understanding of the microstructure. He recognised that silica compounds were a different beast entirely from the traditional carbon black mixtures. “We looked at the compounds’ processing behaviour by looking to the degree of freedom of the rubber molecules moving around in their microstructure,” he says.

By understanding how silica hindered or helped the ‘relaxation’ of rubber molecules after extrusion, Dr Nijman was able to control ‘extrudate swell’ – the tendency of rubber to expand like a sponge after being squeezed through a die. Without this scientific insight, manufacturers faced uncontrolled shrinkage, leading to tyres that simply didn’t fit the rim.

THE PORSCHE 911 CHALLENGE: WHEN THEORY MEETS THE ROAD

Perhaps the most gruelling test of Dr Nijman’s career wasn’t a tyre at all, but a piece of high-performance aerodynamics: the active front spoiler for the Porsche 911 Turbo. This rubber lip had to deploy at high speeds via air bellows and retract perfectly through its own elasticity once the car slowed down.

The stakes were astronomical. Porsche demanded ‘A1 surface quality’ – meaning the rubber had to be absolutely flawless, with zero visual defects and uncompromised functionality, all while meeting the strict Start of Production (SOP) deadlines of one of the world’s most iconic cars.

“Naming it a challenge was an understatement,” Dr Nijman admits. The project required a total immersion in the material’s behaviour. Dr Nijman describes his method as almost meditative: “I try to be part of the microstructure of the rubber compound on its way from rubber slab to the shape in which it is conveyed. Then I am able to ‘observe’ my surrounding and to ‘see’ what happens with the rubber molecules in their world of fillers, process oils and chemicals.”

THE DIGITAL TRAP: A WARNING TO THE NEXT GENERATION

As Dr Nijman prepares to retire at the end of this year, he looks at the current state of engineering with a mix of admiration and concern. Today’s engineers have access to powerful simulations and AI that Dr Nijman could only dream of in 1987. However, he warns that these tools can be a double-edged sword.

“Engineers tend to believe the results of such simulations are true without critical interpretation,” he says. “In the world of rubber, where chemistry and physics are constantly shifting during the heat of production, a computer model can only go so far. A rubber compound behaves truly visco-elastic. This is not something you can ignore.”

He has observed a shift where younger engineers prefer to solve problems via the Human-Machine Interface (HMI) rather than walking the shop floor. To Dr Nijman, the smell of the rubber and the heat of the extruder are essential data points that a laptop cannot capture. “Both must be done to successfully solve the production problem.”

A SUSTAINABLE FUTURE: THE FINAL FRONTIER

Dr Nijman isn’t using his retirement to slow down; instead, he’s refocusing on the industry’s biggest challenge: sustainability. He believes the next decade of tyre technology won’t just be about grip or speed, but about energy.

“Both tyre manufacturers and extrusion line suppliers should focus more on how to save energy and how to recover heat,” he asserts. He points out a glaring blind spot in current research: while everyone wants ‘sustainable’ compounds, few are looking at reducing the viscosity of the rubber itself – the single biggest factor in how much energy a factory consumes to shape a product.

Reducing scrap and optimising heat recovery, he argues, will require a deeper cooperation between research institutes and manufacturers. “There is still a lot more to be explored scientifically,” he says.

THE LEGACY OF A ‘HUMBLE’ EXPERT

For those entering the field today, Dr Nijman’s advice is simple: love the work, or leave it. But if you stay, never stop asking ‘why’.

“Pursue to deeply understand the problem before you start solving it,” he counsels. “Rubber processing and tyre manufacturing is very exciting... especially if you love being on the shop floor and, at the same time, if you are able to continuously interpret your observations.”

As he prepares to accept the Banbury Award, Dr Nijman remains the same engineer who once spent his Friday nights thinking about molecular orientation. He has spent his career making the complex simple – so simple, in fact, that he measures his success by a unique metric.

“It helped me a lot to realise to explain very complex situations in a way that my mother-in-law would understand,” he says. “That is how I could realise breakthroughs.”

The ‘black magic’ of rubber is gone, replaced by the lifelong work of a man who decided to step out of his comfort zone and look at the world through scientific glasses. Dr Gerard Nijman didn’t just engineer tyres; he engineered a more precise, sustainable and understood future for the entire industry

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HS HYOSUNG ADVANCED MATERIALS has completed and commenced operation of a 17.5-MWp rooftop solar power installation at its facility in Vietnam’s Nhon Trach Industrial Park, located within Dong Nai Province. This marks a significant step in the company’s broader effort to reshape its Vietnam operations – its largest global manufacturing base for tyre cords and technical yarns – into what it terms a ‘Smart Green Factory’. By merging renewable energy infrastructure with digital energy management systems, developed in partnership with the energy IT specialist Nuriflex, the firm is positioning this site at the forefront of its transition towards becoming a global eco-friendly manufacturing hub.

A key element of this transformation is the deployment of an Internet of Things based energy management system, which allows for real-time oversight of electricity generation and equipment performance. This digital layer not only streamlines operational efficiency but also contributes to greater equipment reliability and overall productivity gains, ensuring that the integration of renewable energy delivers tangible improvements beyond simple power generation.

With further solar installations set to be completed by August, total rooftop capacity at the Nhon Trach site will reach 37.5 MWp. Once fully operational in the latter half of the year, HS HYOSUNG ADVANCED MATERIALS anticipates annual electricity cost savings exceeding KRW 6 billion (approximately USD 3.94 million), bolstering its cost competitiveness. The expansion is also expected to deliver meaningful reductions in greenhouse gas emissions, reinforcing the company’s long-term commitment to sustainable management practices.

Through advanced energy IoT solutions, the Vietnam subsidiary now systematically manages carbon reduction data generated from its solar power operations. This capability enables a more structured response to rising demands from major global customers – including Michelin, Bridgestone, Goodyear, Continental and Pirelli – for verified renewable energy usage and carbon emissions information. By strengthening its ESG performance across the supply chain, the company is leveraging its solar infrastructure and smart energy management not merely as facility investments but as strategic tools to enhance environmental responsibility and competitiveness in a market where sustainable value chains are increasingly essential.

“Starting with our Vietnam production base, we are simultaneously promoting renewable energy transition and energy efficiency improvements across our operations. By expanding solar power facilities, we will strengthen both cost competitiveness and ESG capabilities while proactively responding to the evolving requirements of our global customers,” said an official from HS HYOSUNG ADVANCED MATERIALS.

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The Association of Natural Rubber Producing Countries (ANRPC) has released its Monthly NR Statistical Report for February 2026, detailing a period of significant market activity influenced by geopolitical tensions, macroeconomic changes and shifting supply-demand dynamics within the global natural rubber sector.

As per the report, global natural rubber production for 2026 is forecast to reach 15.324 million tonnes, a 2.2 percent increase from the 14.996 million tonnes recorded in 2025. February output alone is projected at 994,000 tonnes, marking a 3.4 percent year-on-year rise due to favourable weather and higher rubber prices. Despite this overall growth, production trends vary among member nations. While Thailand is expected to remain the top producer, Indonesia and Vietnam face short-term constraints from structural and agronomic issues. Meanwhile, Malaysia is advancing efforts to restore abandoned plantations, with the Rubber Production Incentive activated in Sarawak and Sabah and the Malaysian Rubber Board targeting the rehabilitation of 4,137 hectares of idle land in 2026.

Physical and futures markets saw notable price increases across major grades in February. In Kuala Lumpur, SMR-20 averaged USD 2.01 per kilogramme, a 5.13 percent monthly gain, while STR-20 in Bangkok rose 5.12 percent to USD 2.11 per kilogramme. Sheet rubber grades also strengthened, with RSS-3 increasing 7.84 percent to USD 2.35 per kilogramme and RSS-4 in Kottayam surging 10.38 percent to USD 2.34 per kilogramme. Centrifuged latex in Kuala Lumpur closed the month at USD 1.61 per kilogramme. Futures mirrored this firming trend, as the Shanghai Futures Exchange May 2026 contract averaged roughly 16,508 CNY (approximately USD 2,388) per tonne and the SGX contract averaged USD 1.92 per kilogramme, supported by strong demand and tightening supply expectations ahead of the seasonal low-yield period from February to May.

Crude oil volatility added further complexity, with Brent averaging USD 70.89 per barrel in February – up 6.43 percent from January – before spiking to approximately USD 104 per barrel in early March following military actions in the Middle East and the closure of the Strait of Hormuz, a conduit for nearly 20 percent of global oil supply. This has introduced a risk premium with implications for synthetic rubber competitiveness and natural rubber demand. Currency shifts also play a role, as the Malaysian Ringgit appreciated modestly to 3.89 MYR per USD and the Thai Baht strengthened to around 31.08 THB per USD by late February, affecting trade competitiveness. Looking ahead, rising automotive production, especially of new energy vehicles in China, India and Southeast Asia, is expected to sustain demand and support prices. However, risks persist from US-China trade tensions, Middle East geopolitical instability, weather uncertainties during the low-yield season and currency fluctuations tied to US monetary policy, all of which could disrupt supply chains and export revenues.

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