Hindalco Industries Limited commissioned India’s first Superfine Precipitated Aluminium Trihydrate (PPT ATH) plant at its Belagavi alumina refinery in Karnataka on 27 August 2026, ending the country’s total dependence on imports for this high-value specialty alumina product. The greenfield facility has started with an annual capacity of 30,000 tonnes, scalable to 60,000 tonnes, and is the world’s only specialty alumina plant powered entirely by renewable energy. The product, marketed under the InnoSafe brand, is a halogen-free flame retardant used in cables, polymer insulators, thermal insulation, composites and paints.
What Is Superfine Precipitated Aluminium Trihydrate (PPT ATH)?
Aluminium Trihydrate (ATH) is the common industrial name for the chemical compound aluminium hydroxide, with the formula Al(OH)3. It is a fine, white, odourless powder produced as a refined intermediate during alumina refining. ATH contains roughly 35% water of crystallisation by weight, and this bound water is the reason the material behaves the way it does under heat.
There are two broad families of ATH used in industry. The first is ground or coarse hydrate, made by simply milling the natural hydrate crystals. The second is precipitated ATH, made by carefully controlled chemical precipitation that yields extremely fine, uniform particles with very low impurity levels. Superfine Precipitated ATH (PPT ATH) sits at the top of this family. The particles are typically only 1 to 2 microns across, far smaller than ground grades, which gives them a much higher surface area and better dispersion inside polymer matrices.
That tiny particle size matters because PPT ATH is not sold as a bulk commodity. It is a functional additive, a specialty ingredient that buyers blend into other materials to give them specific fire-safe properties. Until the Belagavi plant came online, India imported every kilogram of this superfine grade used by domestic cable, insulation and coating manufacturers.
How ATH Works as a Halogen-Free Flame Retardant
ATH is the most widely used flame retardant in the world. Its effectiveness comes from chemistry, not chemistry tricks. When ATH is heated to around 200°C, the bound water inside it begins to break free. By roughly 205°C, ATH has released almost all of its 35% water of crystallisation as steam, while the aluminium itself converts to aluminium oxide (Al2O3).
This single reaction delivers three firefighting effects at once. First, the breakdown is endothermic, meaning it absorbs heat. Pulling heat out of a fire is the simplest way to cool it. Second, the released steam dilutes the flammable gases and oxygen around the flame, starving the fire of fuel. Third, the solid aluminium oxide residue left behind forms a protective ceramic-like layer on the surface of the polymer, blocking further heat and oxygen from reaching the material underneath.
The chemical equation is simple: 2 Al(OH)3 -> Al2O3 + 3 H2O, absorbing about 1.3 kJ of heat per gram. For comparison, heating 1.5 grams of ordinary plastic from room temperature to its decomposition point would require almost the same amount of energy. One gram of ATH, in effect, neutralises the thermal energy needed to destroy a chunk of plastic.
This is why ATH is classified as a Halogen-Free Flame Retardant (HFFR). Older flame retardants relied on bromine or chlorine compounds, which smother flames but release toxic halogen acid gases when they burn. These gases are corrosive, can damage electronics and, more critically, are extremely dangerous to humans during a building fire. ATH, by contrast, releases only water vapour. It is non-toxic, non-corrosive, and produces very low smoke, making it the preferred additive for enclosed spaces like metros, airports, hospitals, tunnels, data centres and high-rise residential buildings.
HFFR vs FRLS: A Quick Comparison
| Feature | FRLS (IS 694:2010) | HFFR (IS 17048:2018) |
|---|---|---|
| Base insulation | PVC (contains chlorine) | Halogen-free thermoplastic or XLPE |
| Halogen acid (HCl) limit | Up to 15% by mass | 0.5% by mass |
| Smoke on burning | Moderate | Low smoke, light transmittance 60% minimum |
| Toxicity during fire | Measurable HCl release | Near zero |
| Typical applications | Residential, G+3 buildings | Hospitals, metros, airports, G+4 and above |
| Standard body | Bureau of Indian Standards | Bureau of Indian Standards |
Inside the Belagavi Plant: Capacity, Energy and Investment
The new plant sits inside Hindalco’s existing Belagavi alumina refinery in northern Karnataka, close to the Maharashtra border. The refinery itself has been operational since 1969 and was originally set up to feed metallurgical alumina into Hindalco’s primary aluminium smelters. From the 1980s onwards, it was deliberately repositioned as a 100% specialty alumina facility, the only one of its scale in India today.
The PPT ATH unit has been built with an investment of around ₹400 crore. In its first phase, the facility can produce 30,000 tonnes per annum. Hindalco has stated that this volume is calibrated to meet almost the entire current domestic demand for safer cables from the Indian wire and cable industry, a striking statement given that India’s PPT hydrate market has, until now, been 100% import-dependent and growing at roughly 10% annually.
The plant is engineered for phased expansion to 60,000 tonnes per annum as the domestic market grows. The trigger for the next phase will come from a combination of stricter fire-safety enforcement, the rising adoption of electric vehicles, and the construction of new metro rail, airport, hospital and data-centre infrastructure, all of which increasingly require HFFR-grade cabling.
Powered Entirely by Renewables
What makes the Belagavi unit stand out globally is its energy profile. It is the world’s only specialty alumina plant operating entirely on renewable power, drawing 100% of its electricity from biomass, solar and wind sources. The broader Belagavi refinery ran on renewable energy for four continuous months in FY26, a first for an alumina refinery of this size anywhere in the world.
The greenhouse-gas intensity of the operation is correspondingly low. The Belagavi refinery recorded a GHG intensity of 0.44 tCO2e per tonne of alumina on a year-to-date FY26 basis. For comparison, the global average for alumina refining sits well above 1 tCO2e per tonne, which means Belagavi’s footprint is roughly half or less of the industry norm. Hindalco has also eliminated liquid discharge from the site, and even its red mud (bauxite residue) waste is being put to productive use.
The PPT ATH product itself is sold under the InnoSafe brand and is positioned to serve five major application areas: HFFR cables and cable compounds, polymer insulators for high-voltage transmission, thermal insulation foams, composites, and paints and coatings.
Hindalco’s Specialty Alumina Business: The Bigger Picture
The Belagavi PPT ATH plant is the latest move in Hindalco’s deliberate shift from commodity to specialty within its alumina portfolio. Hindalco Industries Limited is the metals flagship of the Aditya Birla Group, one of India’s largest conglomerates. The company was incorporated on 15 December 1958 as Hindustan Aluminium Corporation Limited, in collaboration with Kaiser Aluminium of the United States. It began production at Renukoot in Uttar Pradesh in 1962 and was renamed Hindalco Industries in 1989. Its registered office is in Mumbai, and the company is part of the NSE Nifty 50 index.
Today, Hindalco operates 48 manufacturing facilities across 10 countries and is the world’s largest aluminium company by revenue. Its consolidated turnover stood at around ₹238,496 crore (about $25 billion) in FY25. Through its subsidiary Novelis (acquired in 2007), it is also the world’s largest recycler of aluminium and a leading producer of flat-rolled products used in beverage cans, automobiles and aerospace.
The Specialty Alumina vertical sits within this larger metals empire. Hindalco is India’s largest producer of specialty alumina and currently manufactures more than 120 different grades of non-metallurgical alumina and hydrates across two units: Belagavi in Karnataka and Muri in Jharkhand. Its products reach over 1,000 customers in 42 countries and serve applications ranging from refractories and ceramics to water treatment, batteries, electronics, polishing compounds and display glass for smartphones.
The total specialty alumina capacity at Belagavi and Muri stands at around 460,000 tonnes per annum today. Hindalco has signalled that several more specialty alumina facilities are expected to be commissioned over the next few months, with a combined additional capacity of more than 100,000 tonnes per annum. Once these come online, the company’s total specialty alumina capacity will cross 900,000 tonnes per annum. The global specialty alumina market is currently estimated at over 8 million tonnes, and Hindalco already holds roughly 9 to 10% of this market, making it one of the top three players worldwide.
Within this portfolio, Hindalco’s ATH products have been gaining ground because of growing global safety norms. Its ATH grades are already used in fire-safety applications ranging from Vande Bharat trains to advanced power and communication cables, and the company is now positioning PPT ATH as its flagship flame-retardant additive for next-generation HFFR cables, EVs and high-performance polymers.
Why This Plant Matters: Import Substitution and the HFFR Cable Push
The significance of this plant goes well beyond one factory. It sits at the intersection of three powerful currents shaping Indian manufacturing: stricter fire-safety regulation, the rapid growth of electric mobility and infrastructure, and the government’s Atmanirbhar Bharat push to localise critical material supply chains.
Closing a Decade-Long Import Gap
India’s PPT hydrate market has been completely import-dependent, with volumes growing at roughly 10% per year. Until now, Indian cable and insulation manufacturers had to source this high-purity additive from producers in Europe, China and the United States, often with long lead times, unpredictable pricing and limited scope for joint product development. With the Belagavi plant, Hindalco becomes the first and only domestic manufacturer of superfine precipitated ATH, giving Indian buyers a local, predictable, technical-supported source.
Aligning with India’s HFFR Cable Standards
The Indian regulatory framework is increasingly tilting towards HFFR. The Bureau of Indian Standards (BIS) brought out IS 17048:2018, the Indian Standard for Halogen-Free Flame Retardant cables used in power and lighting installations up to and including 1100 V. This standard is largely aligned with global benchmarks such as IEC 60332 and IEC 61034.
The National Building Code of India (NBC) 2016 further mandates HFFR cabling for G+4 and above buildings, hospitals, metro rail, airports, underground structures and public assembly buildings. As Indian cities densify and new infrastructure comes up, demand for HFFR-compliant wiring is rising sharply. Hindalco’s claim that the Belagavi plant can already meet almost all of India’s current HFFR cable demand is therefore not just a sales pitch. It reflects the reality that India’s domestic wire and cable industry has been waiting for exactly this kind of supply.
Enabling Electric Vehicles and Modern Mobility
Electric vehicles carry far heavier electrical loads than conventional cars and operate in tighter, hotter enclosures. Their wiring harnesses demand cables that can withstand higher temperatures and suppress flame and smoke aggressively if anything goes wrong. PPT ATH is a critical additive in these next-generation cable compounds. The commissioning of the Belagavi plant therefore also supports India’s EV manufacturing ambitions, including the PM Electric Drive Revolution in Innovative Vehicle Enhancement (PM E-DRIVE) scheme and the broader Made-in-India push for clean mobility.
Sustainability as a Selling Point
The plant is the world’s only specialty alumina facility to operate entirely on renewable energy. In a sector where carbon footprint is increasingly becoming a procurement criterion for global buyers, a low-emission, locally produced flame retardant gives Indian cable exporters a competitive edge. Hindalco has tied the plant into its wider ESG commitments, including ASI (Aluminium Stewardship Initiative) certification at Belagavi and group-wide commitments to the Dow Jones Sustainability Index.
The Way Forward
The Belagavi plant is best understood as the opening chapter of a much larger specialty alumina build-out by Hindalco. The company has indicated that more specialty alumina facilities will be commissioned over the coming months, taking total specialty alumina capacity past 900,000 tonnes per annum. Within this expansion, PPT ATH is expected to play a growing role as Indian cable, polymer and insulation industries move away from halogenated retardants.
For Hindalco, the strategic logic is clear. Aluminium and copper prices remain robust, but the real margin sits downstream, in value-added products where technical specifications, purity and application support matter more than raw tonnage. PPT ATH, boehmite, white fused alumina and other specialty grades give the company a way to monetise its existing mines-to-market integration while building resilience against commodity price swings. Hindalco is also expanding its aluminium smelting capacity by 180 KTPA at the Aditya facility in Odisha, scheduled for FY 2027-28, alongside the 850 KTPA Aditya alumina refinery greenfield project.
For India, the plant’s biggest contribution is symbolic as much as industrial. It demonstrates that complex specialty chemicals, once considered the exclusive preserve of Western and East Asian producers, can be developed and manufactured domestically using an integrated mine-to-market model. The combination of R&D at Hindalco’s Innovation Centre for Alumina (HIC-A) at Belagavi, the captive bauxite source, the renewable energy backbone and the application engineering team means India now has an end-to-end capability in halogen-free fire-protection chemistry that it did not possess a year ago.
Key Takeaways
- Hindalco Industries Limited commissioned India’s first Superfine Precipitated Aluminium Trihydrate (PPT ATH) plant at its Belagavi alumina refinery in Karnataka on 27 August 2026, ending the country’s total import dependence on this specialty material.
- The facility has an initial annual capacity of 30,000 tonnes, scalable to 60,000 tonnes, and was set up with an investment of about ₹400 crore.
- PPT ATH is the highest-purity grade of Aluminium Trihydrate (Al(OH)3), with particle sizes of only 1 to 2 microns, used as a halogen-free flame retardant (HFFR) in cables, polymer insulators, thermal insulation, composites and paints.
- The plant is the world’s only specialty alumina facility to operate entirely on renewable energy (biomass, solar and wind), with the Belagavi refinery recording a GHG intensity of 0.44 tCO2e per tonne of alumina in YTD FY26.
- ATH works through the endothermic reaction 2 Al(OH)3 -> Al2O3 + 3 H2O, absorbing about 1.3 kJ/g of heat and releasing only water vapour, with no toxic halogen acid gases.
- The product is sold under Hindalco’s InnoSafe brand and supports compliance with IS 17048:2018, the Bureau of Indian Standards specification for Halogen-Free Flame Retardant cables used up to 1100 V.
- Hindalco Industries, the metals flagship of the Aditya Birla Group, was incorporated on 15 December 1958 and is the world’s largest aluminium company by revenue, operating 48 manufacturing facilities across 10 countries.
- India’s PPT hydrate market has been growing at roughly 10% per year and was 100% import-dependent before the Belagavi commissioning, with Hindalco already holding 9 to 10% of the global specialty alumina market.
