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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

Cement Makers’ Margins To Fall Rs 50-75 Per Tonne Amid West Asia Conflict

Crisil Sees Margins Easing Despite Steady Demand

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Crisil said operating margins of Indian cement manufacturers are expected to decline by Rs 50-75 per tonne (t) this fiscal to Rs 925-950 per t due to higher input costs triggered by the West Asia conflict. The analysis covered 18 cement companies accounting for nearly 90 per cent of India’s domestic cement capacity and noted margins had improved sharply to around Rs 1,000 per t in fiscal 2026.

Crisil noted that the reduction would be driven mainly by higher power and fuel costs, which account for about 30 per cent of total costs, as petcoke and imported coal prices have surged amid geopolitical uncertainties. Freight costs, which account for about a quarter of total costs, are also expected to remain elevated because of higher diesel prices. The impact on profitability is likely to be more pronounced in the first half of the fiscal year before easing commodity prices moderate cost pressures later.

The rating agency said steady domestic demand and strong balance sheets should keep credit profiles stable despite the moderation in margins. Green energy currently accounts for 35-40 per cent of the sector’s total electricity consumption and is expected to partly cushion higher energy costs. Operating cash flows are likely to remain resilient, supported by projected 6-7 per cent growth in cement demand this fiscal.

Crisil highlighted that demand growth will be driven primarily by infrastructure spending, which meets about one-third of sector consumption, and by a nearly 18 per cent higher budgetary allocation for core ministries that should support project execution. Weaker rural housing demand amid pressure on agricultural incomes from a possible below-average monsoon may be offset by improved urban housing demand supported by favourable home-loan rates and a strong pipeline of Pradhan Mantri Awas Yojana-Urban projects. Ongoing capacity additions will keep capital expenditure elevated and may lift net debt to EBITDA to between 1.2 and 1.4 times from around 1.0 time last fiscal, though ratios are expected to remain healthy.

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Concrete

UltraTech Board Approves Rs 50 bn Fundraise Via NCDs

Company to issue half a million debentures for expansion plan

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UltraTech Cement’s board of directors has approved raising Rs 5,000 crore (Rs 50 bn) through non?convertible debentures issued in rupees.

The finance committee cleared a proposal to issue up to 500,000 fully paid, unsecured, listed, rated, redeemable, rupee?denominated, non?convertible, non?cumulative debentures of Rs 1 lakh each (Rs 0.1 mn each), aggregating to the Rs 5,000 crore programme.

As of June 2026 the firm reported net debt of Rs 15,875 crore (Rs 158.75 bn) and said its capacity expansion projects under execution are backed by capital expenditure of about Rs 17,000 crore (Rs 170 bn) over the next two to two?and?a?half years.

UltraTech spent Rs 9,500 crore (Rs 95 bn) on capital expenditure in financial year 2026 and in April the group crossed 200.1 mn tonnes per annum of domestic grey cement capacity and 205.5 mn tonnes per annum of global capacity.

The chief financial officer indicated the company would take consolidated capacity beyond 242 mn tonnes per annum, with grey cement capacity reaching 212.7 mn tonnes per annum by the end of financial year 2027. He noted the net debt?to?earnings before interest, taxes, depreciation and amortisation ratio stood at 0.87 times as of June 2026 and the company was confident of ending financial year 2027 with the ratio below one time.

In the first quarter of financial year 2026?27 UltraTech’s net profit attributable to owners rose 16.8 per cent year?on?year to Rs 2,599.3 crore (Rs 25.993 bn) and revenue from operations increased 15.9 per cent to Rs 24,648.20 crore (Rs 246.482 bn). The board approval is expected to complement internal cash flows as the company advances its expansion programme.

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Concrete

Lokesh Lays Stone For Rs 31 Billion Cement Unit In Kadapa

Line-2 expansion to make Kadapa a major cement hub

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Andhra Pradesh Education and IT Minister Nara Lokesh on Wednesday laid the foundation stone for the Line-2 expansion of Dalmia Bharat Cement at Chinnakomerla village in Mylavaram Mandal in Kadapa district. The project carries an investment of Rs 31 billion (bn) and is slated for completion by the third quarter of the financial year 2028. The expansion is intended to boost industrial growth and employment generation across the Rayalaseema region.

Once commissioned, the Kadapa facility will become Dalmia Bharat’s largest integrated cement manufacturing ecosystem in southern India, creating over 1,000 direct and indirect jobs and opening new business avenues for regional micro, small and medium enterprises and transport operators. Lokesh said the expansion signalled growing corporate confidence in the state and reflected the practical ease of doing business that secured repeat investment.

He placed the project within the government’s wider economic targets and recalled the Yuvagalam padayatra commitment to generate two million (mn) jobs within five years, noting that the state would cultivate talent while industry created opportunities. Lokesh highlighted Andhra Pradesh’s competitive pursuit of major manufacturing accounts, mentioning past successes and a personal initiative to engage global investors when persuading them to anchor expansion in the state.

The plant will leverage Kadapa’s abundant limestone reserves to scale production and sustainability. Clinker capacity is planned to rise from two point five million tonnes per annum (mn tpa) to six point one mn tpa, while overall cement output will increase from three point six mn tpa to nine point six mn tpa. The unit is designed to operate on over eighty per cent renewable energy and deploy waste heat recovery, zero liquid discharge, water recycling and advanced AI systems to optimise efficiency. Industries Minister TG Bharat, BC Welfare Minister S. Savitha and Jammalamadugu MLA C. Adinarayana Reddy attended the ceremony.

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