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Acryterna beyond heat: The importance of dimensional stability

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Performance and material selection in industrial filtration

Filtration plays a critical role in improving air quality, particularly in industries such as steel, cement and mining. In these sectors, filter cost and service life are key performance indicators. Premature failure of filter bags leads to increased costs, production losses, and environmental concerns, while frequent replacement also raises labour and operational expenses. Therefore, durability and extended service life are central to the evaluation of filtration systems.
Baghouse filtration systems are among the most effective industrial separation technologies for capturing fine particulates. However, evaluating performance solely based on initial filtration efficiency is insufficient. Parameters such as pressure drop, cleanability, dimensional stability, and bag lifetime must be considered together to ensure long-term efficiency and reliability.
Polyacrylonitrile (PAN) fibres are widely used in industrial filtration due to their high thermal stability, low shrinkage, resistance to many organic solvents, and strong hydrolysis resistance. These properties make PAN-based materials particularly suitable for demanding process environments such as cement plants, where acidic conditions are prevalent.

Operating conditions and material performance in cement plants
In the cement industry, hot gas filtration is characterised not only by high temperatures but also by dynamic conditions involving fluctuating humidity and chemical loading. These factors directly affect both filtration performance and material durability.
For this reason, homopolymer acrylic fibres have been developed to provide long-term mechanical and chemical stability under elevated temperatures and harsh operating environments.
The preference for homopolymer fibre-based filter bags in cement plants is driven by several factors, including stable performance within the medium temperature range of 120–140 °C, strong chemical resistance in acidic environments, and cost-effectiveness achieved through extended service life. These characteristics help reduce maintenance frequency while supporting operational continuity.
While homopolymer fibres are recognised in the literature for their chemical and thermal stability, the performance of filter media in cement applications extends beyond particulate capture. Materials must also withstand aggressive process gases, humidity fluctuations, and continuous mechanical stress. Therefore, material selection should not be limited to temperature resistance alone, but should also consider the ability to maintain mechanical, chemical, and dimensional integrity under real operating conditions.

Impact of dimensional stability on filtration performance
Dimensional stability is a critical performance parameter in practical applications. Changes such as shrinkage, elongation, or deformation during service can negatively impact filtration efficiency. These changes may increase friction between the bag and cage, cause stress concentration at seams, and lead to sealing issues at the bag opening.
Acryterna homopolymer fibre has been specifically engineered to minimise these risks through its ‘no dimensional change’ characteristic. This stability ensures predictable bag behaviour, balanced load distribution, and more efficient maintenance planning.

Conclusion
The performance of materials used in hot gas filtration in the cement industry should be evaluated from both polymer chemistry and field performance perspectives. PAN-based structures offer a balanced combination of mechanical strength, thermal stability and chemical resistance, while known degradation mechanisms under hydrolysis highlight the importance of proper material selection. In this context, homopolymer acrylic fibres stand out as a reliable and sustainable solution for demanding filtration conditions.

(Communication by the management of the company)

Concrete

Nuvoco Inaugurates Limla Cement Plant in Surat

Acquisition boosts Western India cement capacity

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Nuvoco Vistas Corporation Limited inaugurated the Limla Cement Plant in Surat, Gujarat, marking a key milestone in its acquisition and revival of Vadraj Cement Limited.

The company completed the acquisition of Vadraj, which had been undergoing a corporate insolvency resolution process, by discharging a consideration of Rs 18 billion (bn) in June 2025. Vadraj’s asset base includes a clinker unit at Kutch and a grinding unit at Limla, along with high quality captive limestone reserves and a captive jetty at Kutch that enhance logistics efficiency.

Since taking over the assets, Nuvoco has undertaken revival, refurbishment and expansion across both sites, culminating in the opening of the Limla facility. The grinding unit at Limla achieved project completion ahead of schedule with the commissioning of two million tonnes per annum (mn t per annum) grinding capacity, further expanding the company’s scale and market reach.

Upon full operationalisation of the Vadraj assets, nearly 40 per cent of Nuvoco’s total cement capacity will be accounted for by plants in the North and West regions, supporting improved access to high growth markets. The plant is expected to support a phased volume ramp up in Gujarat and to serve adjoining markets in western Maharashtra while releasing northern capacities for other markets.

It will produce a complete portfolio of cement products including Ordinary Portland Cement, Portland Slag Cement, Portland Pozzolana Cement and Portland Composite Cement, and will offer the Duraguard range including the premium Duraguard Microfibre. The transaction is set to create synergies with Nuvoco’s existing manufacturing facilities at Nimbol and Chittorgarh, strengthening logistics optimisation and market access across key regions.

Nuvoco reported total income of Rs 113.62 billion (bn) in FY 2025-26 and stated it is on track to consolidate total cement capacity to 35 million tonnes per annum (mn t per annum) by FY2028. The company operates across cement, ready-mix concrete and modern building materials segments and highlighted a pan-India ready-mix presence alongside contributions to major infrastructure projects. Corporate communications contact details were provided by the company.

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Concrete

Nuvoco commissions Surat grinding unit

Nuvoco posts 20 per cent rise in Q1 PAT

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Nuvoco Vistas Corp. has announced its financial results for the quarter ended June 30, 2026, reporting growth in volumes, earnings and profitability while advancing its expansion plans in western India.
The company inaugurated a 2-million-tonnes-per-annum (MTPA) grinding unit at its Limla Cement Plant in Surat on July 11, 2026, ahead of schedule. The facility, part of the Vadraj Cement assets, is expected to strengthen Nuvoco’s presence in western India while freeing up capacity at its Rajasthan plants to cater to demand in northern markets.
Progress at the Kutch project remains on track, with phased commissioning scheduled to begin in the third quarter of FY27. The company has also commenced work on a bulk cement terminal at Viramgam, Sachana, Gujarat, featuring a dedicated railway siding. The terminal is expected to become operational by the second quarter of FY28 and will support distribution across Gujarat. These projects form part of Nuvoco’s capacity expansion programme, which is expected to increase its total cement capacity to 35 MTPA by FY28.
During Q1 FY27, the company recorded cement sales volumes of 5.3 million tonnes, up 5 per cent year-on-year. Consolidated total income rose 9 per cent to Rs 31.29 billion, while EBITDA increased 7 per cent to Rs 5.72 billion, marking the company’s highest-ever first-quarter EBITDA. Profit after tax grew 20 per cent year-on-year to Rs 1.60 billion.
Commenting on the results, Jayakumar Krishnaswamy, Managing Director, Nuvoco Vistas Corp., said the company delivered improved business performance despite macroeconomic and geopolitical challenges. He attributed the results to disciplined execution, cost optimisation and operational efficiencies, while highlighting the early commissioning of the Surat grinding unit as a key milestone in the company’s expansion strategy.
He added that the company remains focused on prudent procurement, supply chain efficiency and cost discipline while monitoring geopolitical developments that could affect industry supply chains and input costs.

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Cement Sector Faces Sluggish Growth in First Half of FY27

April Price Hikes Unlikely To Offset Margin Decline

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Nuvama Institutional Equities has warned that India’s cement industry is expected to record subdued volume growth in the first half of fiscal year 2026-27 before a recovery in the second half. The brokerage assessed that price increases implemented in April 2026 will be insufficient to offset an overall decline in sector profitability. It attributed the outlook to weak demand and fresh capacity additions scheduled during fiscal years 2026-27 and 2027-28 that are likely to keep prices under pressure.

The report noted that demand was sluggish in April and May 2026 owing to global uncertainty, labour shortages, heatwaves, constraints in raw materials and unseasonal rainfall. Producers raised prices across regions in April to mitigate rising petcoke costs and higher packaging expenses, but the increases proved short lived. Nuvama reported that standard petcoke prices rose to USD153/t, around USD41/t higher than in the third quarter of fiscal year 2025-26.

Price correction followed weaker demand, limiting the net increase to about Rs 10-12 per bag by the end of the quarter. Imported petcoke prices have since fallen to USD132/t from a recent peak of USD168/t, although they remained roughly USD20/t higher quarter on quarter. The brokerage expected the higher input cost impact to begin reflecting from late quarter one of FY27 and to continue into early quarter two.

Nuvama also estimated that crude linked increases were likely to raise packaging costs by about Rs 120-150/t and to exert upward pressure on freight. It warned that soft demand combined with significant new supply coming on stream in FY27-28 would keep pricing under strain and constrain near term margin recovery. The report concluded that volume growth was likely to be sluggish in the first half of FY27 before recovering in the second half.

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