As the world grapples with the environmental challenges of discarded tyres, IIT Bombay researchers are developing sustainable solutions by repurposing waste rubber into innovative construction materials. Nilesh Wadhwa reports on how their work not only aims to mitigate landfill waste but also offers unique thermal, electrical and structural benefits for future infrastructure.

With over a billion tyres discarded globally each year, the world faces an escalating crisis in managing tyre waste. Beyond the mounds of rubber in landfills, the environmental and health hazards from tyre degradation, microplastics and toxic emissions are profound. However, a team of researchers at the Indian Institute of Technology (IIT) Bombay is charting a sustainable path forward. By transforming waste tyres into innovative construction materials – Rubcrete, which is a form of concrete mixed with shredded waste tyres. This is said to not only provide strength to the material but also make it more environmentally friendly. The idea is to turn an environmental problem into a valuable resource for civil engineering.

In an interaction with Tyre Trends, Prithvendra Singh, a principal researcher at IIT Bombay, explained the motivations behind this ground-breaking research. “The main aim of this research was to address the dual challenge of excessive end-of-life tyre (ELT) accumulation and the unsustainable depletion of natural aggregates due to ever-rising demand in infrastructural development,” he stated.

By converting waste rubber into engineered rubber aggregates (RA) and rubber-plastic blends (RPB), the team seeks to not only reduce landfill dependency but also enhance the sustainability of construction materials.

This pioneering approach is timely. The sheer scale of tyre waste, with millions of tonnes generated annually, has far-reaching consequences. Tyres are durable, non-biodegradable and pose serious fire hazards.

“One of the most overlooked issues is the generation of microplastics and toxic volatile compounds through tyre wear and tear, degradation, weathering or fires. Landfilled rubber fires can take months to extinguish and result in the emission of carcinogenic gases. These pose risks to human health and ecosystems, and their long-term contamination potential – especially via water, soil and air – is often overlooked in conventional waste management frameworks,” emphasised Singh.

FROM LAB TO FIELD

The IIT Bombay team’s research has revealed promising properties in both RA and RPB, which could revolutionise the use of secondary materials in civil engineering.

Singh elaborated on the mechanical characteristics, “RA and RPB exhibit significantly lower stiffness and higher deformability than natural aggregates, which makes them suitable for specific geoenvironmental applications but limits their use under high structural loads.”

While these properties may exclude them from load-bearing infrastructure, they open up opportunities in other areas. “Despite their lower mechanical strength, both materials demonstrate promising insulation characteristics and environmental safety under controlled conditions,” Singh added.

Thermal and electrical insulation capabilities are where these materials truly shine. “Both RA and RPB have superior thermal resistivity compared to standard sand, confirming their suitability for thermal insulation. Electrically, dry RPB shows the lowest conductivity, making it highly suitable for electrical insulation applications. Both materials also act as excellent dielectric materials over a broad frequency range,” Singh explained.

These characteristics make them ideal for construction projects where insulation and resistance to extreme temperatures or electrical fields are critical, such as in utility corridors or specialised building applications.

However, the journey from laboratory research to real-world applications is not without its challenges. “The lower stiffness of RA leads to higher vertical deformation under applied loads, making them less suitable for high-load applications such as base layers of highways,” Singh pointed out.

“However, they are ideal for lightweight fill applications like embankments or drainage layers, where flexibility and energy absorption are more beneficial than stiffness,” he added.

This insight highlights the potential for using RA and RPB in applications where traditional materials fall short, such as in earthquake-prone regions or on unstable soils where flexibility can mitigate damage. The process of creating RA and RPB depends heavily on the methods used to shred and process waste tyres.

SHREDDING METHODS: BALANCING COSTS AND PERFORMANCE

Singh outlined the pros and cons of various shredding technologies. “Ambient shredding is cost-effective but produces rough-surfaced particles, which exhibit better interaction in cement and polymer composites,” he noted. “Cryogenic shredding yields smoother particles with a broader size distribution but poorer bonding characteristics, and the created particles are generally suitable for turf or sports surfaces. Water-jet grinding offers finer control over particle size but comes at high energy and equipment costs.”

Each method results in materials with distinct properties, influencing their performance in construction applications.

Real-world validation is a crucial step in advancing this technology. To this end, IIT Bombay has partnered with GRP India, a leader in rubber recycling.

“We are currently collaborating with GRP to venture into production and field applications of these sustainable aggregates,” Singh revealed. “This partnership provides a foundation for scaling up through industrial-grade shredding, blending and real-world performance validation.”

These collaborations not only bring academic research closer to commercial implementation but also offer a model for future partnerships between academia and industry.

Of course, environmental safety remains a central concern in adopting new construction materials, especially those derived from waste. Leaching of metals and organic contaminants can pose long-term risks if not properly managed.

Singh’s team addressed these concerns through rigorous testing. “ICP-AES analysis showed that heavy metals like Pb and Zn are present in low concentrations, well within permissible limits,” he reported. “Previous studies corroborate that such materials typically stay within permissible toxicity limits under standard conditions. However, long-term leaching behaviour under varied field conditions remains necessary to confirm safety under varying environmental exposures.” This underscores the need for comprehensive testing and monitoring to ensure environmental safety.

THE ROAD AHEAD

Looking forward, IIT Bombay’s research agenda is ambitious. Singh described plans for further experimentation to expand the applications of RA and RPB. “We are currently planning long-term loading-unloading experiments and elevated temperature testing to establish the thermo-mechanical response of RA and RPB under realistic field stresses,” he said. “These experiments aim to address limitations in durability data and expand application potential. Also, future experiments will simulate realistic landfill environments, including interactions with leachate, microbes, humidity and temperature, to understand long-term behaviour.” Such studies will be essential for certifying these materials for broader use in civil engineering.

Could tyre-derived materials eventually replace traditional aggregates in certain applications? Singh is optimistic. “Yes, particularly in non-structural or semi-structural applications such as leachate drainage layers, landfill covers, thermal insulation barriers and lightweight embankments. The lightweight, high porosity and insulation capabilities of the RA and RPB present unique advantages that traditional aggregates cannot provide,” he said.

This vision aligns with global efforts to promote circular economies and reduce reliance on finite natural resources.

Responding to his expectations from the industry, Singh stated that stakeholders need to support the integration of sustainable materials into mainstream construction.

“The message I would like to convey to the academicians, tyre industry stakeholders and policymakers is to embrace innovation through cross-sectoral collaboration. Sustainable solutions like RA and RPB not only offer environmental remediation but also open new markets for green construction materials. With the right policy incentives, certification frameworks and industry support, we can mainstream these materials and accelerate the transition towards a circular, resilient economy,” he said.

IIT Bombay’s work exemplifies how innovative research, when coupled with industry collaboration and policy support, can turn a pressing environmental problem into a sustainable solution. By reimagining waste as a resource, Singh and his team aim to not only address the tyre waste crisis but also lay the groundwork for more resilient and eco-friendly infrastructure in the future.

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India’s growing importance in the global tyre and rubber industry received a strong endorsement with HF Group announcing a EUR 20 million investment in a new state-of-the-art manufacturing facility in Bengaluru.

The announcement was made during the inauguration of HF India’s new Assembly Hall Unit II, a milestone that reflects the company’s long-term commitment to India and its confidence in the country’s manufacturing future.

The proposed greenfield facility will be developed on a 10-acre site near Bengaluru Airport and is scheduled for completion by 2028. Spread across nearly 20,000 sq. metres, the new factory will be almost four times larger than the current assembly operations and will incorporate digital manufacturing, automation, smart production systems, and advanced engineering capabilities.

The upcoming facility will focus on productivity, precision engineering, sustainability, and smart manufacturing while supporting both the Indian market and HF’s global operations. The investment underlines the company’s confidence in India as a major manufacturing hub for the global tyre and rubber industry.

Ian Wilson, Managing Director & Co-CEO, HF Group, said, “This is not the end of our investment in India. It is perhaps the end of the beginning. India is entering a take-off decade and the economy runs on tyres. We see tremendous opportunities for growth and are committed to investing in the future of the Indian market.”

With more than 175 years of global experience, HF Group has steadily strengthened its presence in India. The journey began in 1995 with the establishment of Indus to serve the growing rubber processing industry. The partnership with HF Mixing Group in 2011 brought global mixing technology expertise to India, while the complete acquisition of the Indian subsidiary in 2024 marked another important milestone in the company’s India strategy.

Today, HF India manufactures and supports a broad portfolio of mixing and rubber processing equipment, including intermeshing and tangential mixers, banbury technology, mills, curing presses, and aftermarket services. The company also offers process support, training, upgrades, inspections, and spare parts under its customer-centric philosophy of ‘Holding the Customer’s Hand.’

Emphasising the importance of customer partnerships, Wilson said, “We are not here simply to sell machinery. We want to hold our customers’ hands throughout the entire lifecycle of their equipment and support them through process optimisation, performance improvements and future growth.”

As HF embarks on its next chapter in India, the new facility represents not only an investment in manufacturing capacity but also a long-term commitment to localisation, technology and customer partnerships.

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TBC Corporation (TBC), one of North America’s largest marketers of automotive replacement tyres through wholesale and franchise operations, has named Ron Harper as its new Chief Supply Chain Officer. He will report directly to President and CEO Don Byrd and assume responsibility for the company’s entire supply chain function.

Harper brings over 26 years of experience steering global supply chains for multi-billion-dollar enterprises. His most recent role was Executive Vice President of Supply Chain at PrimeSource Building Products, overseeing planning, inventory, repack operations, service metrics and analytics. He has also held senior logistics and strategy positions at Sonepar USA, Nordstrom, Samsung SEA, and JCPenney.

The new chief holds a master’s degree in supply chain management from the University of Denver and a bachelor’s in industrial management from Michigan Technological University. His appointment underscores TBC’s focus on strengthening operational efficiency and logistics performance.

Byrd said, “Ron’s depth of experience in building transformative supply chain solutions aligns with our deep commitment to providing customers with the high-level efficiency, product availability and agility they expect from TBC. As market needs change and demands fluctuate, TBC is continuing to respond by having a supply chain strategy that minimises disruptions and maximises efficiency to ensure the highest levels of customer support and satisfaction.”

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The Rubber Board of India has announced the appointment of N Hari as its new Chairman, effective for a tenure of three years. Hailing from Pallikkathode in Kottayam, Kerala, Hari brings considerable experience to the leadership role, having previously served as a Board member representing small rubber growers from the state.

His initial term on the Board commenced on 28 June 2022 and spanned three years. During this period, he also held the position of Executive Committee Member from 7 October 2023 to 6 October 2024. This progression from membership to the executive committee and now to the chairmanship reflects his sustained engagement with the organisation.

His appointment is expected to steer the Board's initiatives in supporting the rubber sector, focusing on grower welfare and industry development across India.

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The Indian automotive landscape is currently undergoing a seismic shift. Driven by the rapid rise of rural urbanisation, an aggressive government push for electrification and the development of world-class road infrastructure, the industry is witnessing a period of robust growth. With sales of both new and used vehicles touching record highs, the demand for high-quality tyres remains in a significant upswing.

At the helm of one of the market’s most prominent players is Rajarshi Moitra, Managing Director of Bridgestone India and Vice-Chairman, Automotive Tyre Manufacturers’ Association (ATMA).

In an interaction with Tyre Trends, Moitra discusses the company’s future-ready roadmap, from its substantial capacity expansions to a ‘sharp and deep’ strategic focus designed to maintain leadership in an increasingly premium and electrified market.

A BULLISH OUTLOOK ON THE SUBCONTINENT

While global economic indicators remain varied, Moitra is unequivocally optimistic about the local trajectory. “The Indian automotive industry is at an exceptionally positive juncture from a medium-to-long-term perspective,” he asserts.

This optimism is grounded in several structural tailwinds that suggest India is slated for very strong growth. Key among these factors is the sheer room for market expansion.

“Firstly, we are still significantly under-indexed in terms of car penetration, with only 50 cars per 1,000 people – well below even some smaller developing nations,” Moitra explains.

Furthermore, the geographical spread of wealth is changing. Bridgestone is observing massive growth in Tier 2, 3 and 4 towns, a phenomenon Moitra attributes to ‘rural urbanisation’.

Bridgestone India estimates a transformative half-decade ahead for the industry. “The number of affordable households – those capable of purchasing a car – will double in India over the next five year. When you couple this with the government’s massive capital outflow into road connectivity and the rise of e-commerce, it creates a very bullish environment for both passenger and commercial mobility,” Moitra says.

THE ‘SHARP AND DEEP’ STRATEGIC PILLAR

Despite India being the world’s largest two-wheeler market, Bridgestone is famously absent from that segment – and intends to stay that way for now. Moitra clarifies that the company’s philosophy is rooted in specialisation rather than horizontal expansion. “At Bridgestone, we believe in being ‘sharp and deep’ in our strategy,” he says.

Currently, Bridgestone India’s business split is heavily weighted towards the consumer segment, with 70 percent of sales coming from Passenger Car Radial (PCR), 25 percent from Truck and Bus Radial (TBR) and 5 percent from Off-the-Road (OTR) segment.

“We see enough headroom for growth within the passenger car segment across products, channels and customer experience, so we are focusing our resources on maintaining our leadership there,” Moitra notes, dismissing any near-term plans to enter the two-wheeler space.

Instead, the company is doubling down on ‘white spaces’ within the consumer car category, specifically targeting higher rim diameters and specialised compounds for Original Equipment Manufacturers (OEMs).

INVESTING IN CAPACITY AND LOCAL INTELLIGENCE

To support this growth, Bridgestone is moving aggressively on the manufacturing front. With current operations running at 90–95 percent capacity, the company is in the midst of a major investment cycle.

At present, the company’s Pune plant has a capacity to produce 4.01 million passenger car tyres and around 693,000 truck & bus radial tyres, while the Indore plant has a capacity to produce 7.11 million radial tyres for passenger cars and light trucks.

“Our last major investment was USD 85 million in October 2024, which is being ramped up in phases through 2029,” Moitra confirms. This capital is being used to scale volumes and enhance technical capabilities at the Indore factory.

The new investment is expected to further add 1.1 million tyre production capacity in Pune by CY2029, thus taking its total production capacity to around 11.1 million units in the country.

“Our strategy is two-fold: we want to be future-ready for market demand while simultaneously sweating our current assets to drive higher efficiency,” Moitra explains. Crucially, this expansion isn’t just about physical output; it’s about local autonomy. Moitra highlights that a ‘very large part’ of procurement is now local, decided by teams on the ground in India.

The launch of a Satellite Technology Centre in 2025 has further decentralised the company’s innovation engine. According to Moitra, this centre plays a pivotal role in increasing local leverage and technical presence, allowing the Indian arm to maintain a balance between local agility and global sourcing.

EVs AND PREMIUMISATION

As the Indian market matures, consumers are demanding larger wheel sizes – a trend Moitra says is led by OEMs. “We are seeing a clear market shift towards higher inches – for example, a car like the Maruti Suzuki Swift moving from 14-inch to 15-inch and others moving from 16-inch to 17-inch,” he observes.

Bridgestone’s ‘all-inch’ strategy covers the spectrum from 12 to 20 inches, but their brand strength is most potent in these premium, higher-diameter sizes.

This premiumisation dovetails with the transition to electric vehicles (EVs). Bridgestone has positioned itself with an ‘EV-ready’ portfolio, exemplified by the Turanza 6i. “It balances long-lasting durability and safety with low noise and comfort – essential for EVs,” says Moitra. To ensure they capture this nascent but fast-growing market, the company expanded the range from 36 sizes in 2024 to 72 sizes by 2025.

The OEM relationship remains the cornerstone of this technological foresight. “The OEM segment allows us to see ahead of the curve regarding future vehicle technologies,” Moitra explains.

At present, 35 percent of their consumer business is OE-based and Bridgestone is in active discussions with many of the newer automotive entrants arriving in India.

While Bridgestone is aggressively expanding its footprint in new tyre technology and premium consumer segments, it is taking a markedly more conservative approach towards the retreading sector in India. Despite the potential for material circularity, the company does not view retreading as a strategic priority for the immediate future.

Moitra clarifies that Bandag, Bridgestone’s global retreading arm, is not currently active in India, and there are no plans to introduce it in the near-term. This decision is driven largely by the unique and challenging dynamics of the local market, which is currently dominated by cold retreading.

He points out that a significant pricing challenge exists when ‘cold retreads versus biased tyres versus some of the cheaper tyres’ are compared, making the business case difficult to justify at this stage. Consequently, Bridgestone has opted to remain focused on its core segments for the next two to three years rather than entering the retreading space.

SUSTAINABILITY AND THE ‘INSTITUTION OF RESPECT’

Beyond the numbers, Bridgestone is attempting to build what Moitra calls an ‘institution of respect’. This involves a heavy commitment to environmental goals. The Pune plant already holds the distinction of being the first carbon-neutral facility in the Bridgestone group.

“Sustainability is a core agenda across our entire value chain,” Moitra explains, noting a public commitment to reduce the company’s carbon footprint by 50 percent by 2030, including Scope 3 emissions. This holistic approach ranges from manufacturing processes to material circularity in the tyres themselves.

Looking ahead, the goal is to protect a dominant market share – currently over 20 percent by volume and 23 percent by value in the passenger car aftermarket. To do this, Bridgestone plans to expand its physical reach by 30 percent over the next five years, building upon its current network of over 4,000 touchpoints.

As the company transitions its branding from the Olympics to Formula E, the focus remains clear: high performance and the next era of mobility. “It’s the perfect platform to showcase our technological edge,” Moitra concludes.

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