What is a precipitated silica project report?
A precipitated silica project report is a detailed project report (DPR) for a plant that reacts sodium silicate with sulphuric acid to make amorphous silica powder or granules. It sets out the process, machinery, raw materials, grades, buyers, project cost, means of finance, five-year projections, DSCR and break-even that a lender or investor needs.
Chemical entrepreneurs, tyre and rubber compound makers planning backward integration, and banks appraising the loan use it to decide plant size and test whether the unit can repay.
Also known as: precipitated silica business plan, project report on precipitated silica, DPR for precipitated silica plant, white carbon black project report, hydrated silica manufacturing feasibility report.
Precipitated silica manufacturing plant cost in India: our sample
The sample report models a 12 MT per day plant that buys liquid sodium silicate, runs 330 days a year and makes 3,960 MT a year at full capacity. It starts at 60% utilisation, reaches 80% in Year 5 and sells at ₹42,200 per MT ex-GST.
| Land and site development | 69.77 |
|---|---|
| Building and civil works | 180.12 |
| Plant and machinery | 374.09 |
| Other fixed assets | 66.92 |
| Contingencies | 27.71 |
| Preliminary and pre-operative | 17.97 |
| Working capital margin | 38.55 |
| Total | 775.13 |
| Promoter's contribution (25%) | 193.78 |
|---|---|
| Term loan from bank (75%) | 581.35 |
| Cash credit limit (separate) | 115.65 |
| Total project cost | 775.13 |
Plant and machinery is almost half the project cost, and the spray dryer is the largest single item. DSCR (debt service coverage ratio) compares the cash a year earns with the loan instalments due. Its lowest value in the sample is 1.22, so lenders will test the silicate price and dryer fuel assumptions behind it.
Term loan at 10.5% with a 6-month moratorium and 54 monthly instalments. All figures are illustrative.
Precipitated silica manufacturing process
Precipitated silica is made by a wet chemical route: silica is thrown out of a sodium silicate solution by acid, then separated, washed and dried. Particle size and surface area are set in the reactor, so the first three steps decide the grade.
- Silicate dilution
Liquid sodium silicate is diluted with soft water to the set silica concentration and heated in the reactor, usually to 80–90°C.
- Precipitation
Dilute sulphuric acid is dosed at a controlled rate under steady stirring, and silica particles form and grow into aggregates.
- Ageing and pH adjustment
The slurry is held at temperature and brought to its final acidic pH, which fixes surface area and stops further growth.
- Filtration and washing
A membrane filter press separates the silica cake and washes out the sodium sulphate formed in the reaction.
- Drying
The cake is reslurried and spray dried to a free-flowing powder with moisture in the range buyers specify.
- Milling or granulation
Powder grades are milled and air classified; tyre grades are compacted into granules that flow and disperse well in rubber mixers.
- Testing and packing
Each lot is tested for surface area, moisture, pH and soluble salts, then packed in valve bags of 20–25 kg.
Which silicate source and dryer should the plant use?
The biggest design choice is where the sodium silicate comes from. It sets the raw material cost, the capital cost and how much energy the plant needs.
| Bought-in liquid silicate | Lowest capital cost and fastest start, as in our sample. Margin depends on the silicate supplier's price, and freight on a product that is mostly water adds up beyond a few hundred kilometres. |
|---|---|
| Silicate made on site from sand and soda ash | Silica sand and soda ash are melted in a furnace and the glass is dissolved under steam pressure. It cuts raw material cost but adds a furnace, fuel, emission controls and a larger capital outlay. |
| Silicate from rice husk ash | Ash is digested with caustic soda at low temperature. It suits sites near rice mills or husk-fired boilers, but ash carbon and colour vary and must be controlled for white grades. |
| Spray dryer | Gives uniform, low-dust powder and is the usual choice for rubber and tyre grades. It is the largest machine in the sample and the main user of fuel. |
| Flash or rotary dryer | Cheaper to buy and suits carrier and feed grades, but the product needs more milling and its particle size spread is wider. |
Start simple, integrate later: many plants begin on bought-in silicate and add their own silicate unit once volumes and buyer approvals are secure.
Raw materials for precipitated silica
Sodium silicate is bought by its silica to soda ratio and solids content, so the purchase contract should fix both. Sulphuric acid is the second input, and the plant also needs a steady supply of soft water for dilution and cake washing.
| Raw material | Share of cost | Year 3 (₹ lakh) |
|---|---|---|
| Sodium silicate solution | 78% | 471.17 |
| Sulphuric acid | 17% | 102.69 |
| Process water treatment chemicals | 5% | 30.20 |
| Total | 100% | 604.06 |
Raw materials are 51.6% of Year 3 sales in the sample. Iron, copper and manganese in the silicate pass into the product, so buyers' limits on these metals apply to your supplier too.
Machinery for a precipitated silica plant
| Machine | What it does | Sample cost (₹ lakh) |
|---|---|---|
| Silicate dissolver and storage tanks | Holds and dilutes the silicate feed | 29.93 |
| Precipitation reactors with agitators | Controlled acid dosing and ageing | 67.34 |
| Membrane filter press with washing system | Separates cake, washes out salts | 59.85 |
| Spray dryer with hot air generator | Dries slurry to powder | 97.26 |
| Milling and air classifying system | Sets particle size of powder grades | 29.93 |
| Effluent treatment plant | Treats sodium sulphate wash water | 44.89 |
| Steam boiler | Heats the reactors | 22.45 |
| Bag filters and valve bag packing machine | Captures fines and packs bags | 22.44 |
| Total plant and machinery | 374.09 | |
Reactors, tanks and filter plates in contact with acid slurry are rubber-lined or made of acid-resistant material. Costs are the sample's estimates; get current quotations before you finalise.
Licences, approvals and standards for a precipitated silica plant
| Business registration | Udyam (MSME) registration and GST registration |
|---|---|
| Pollution board consent | Consent to establish and consent to operate from the State Pollution Control Board. The board decides the category, and the wash water and dryer stack conditions in the consent shape the ETP design. |
| Factory licence | Under the Factories Act, with plans for acid storage and the boiler; rules vary by state |
| Boiler registration | Registration and periodic inspection of the steam boiler with the state boiler inspectorate |
| Product standard | IS 12076:2026, the BIS specification for precipitated silica for the rubber industry, covering silica content, pH, moisture, surface area and trace metals |
| Fire safety | Fire NOC for the dryer, fuel storage and acid store, where required |
Requirements differ by state. Confirm the pollution category and licences with the State Pollution Control Board and industries department before you buy land.
Who buys precipitated silica?
Tyres are a major use. Tyre makers mix silica with a silane coupling agent into tread compounds to lower rolling resistance and improve wet grip. Footwear, conveyor belt and rubber goods makers use it as a white reinforcing filler, and toothpaste makers use special grades as a mild abrasive and thickener.
- Tyre manufacturers, for tread and other compounds
- Footwear soles and rubber goods makers
- Toothpaste and oral care manufacturers
- Animal feed premix and agrochemical formulators, as a carrier
- Paint and coating producers, as a matting agent
- Chemical traders and exporters
Approval comes before volume: every buyer tests lab samples and trial batches before placing regular orders, so plan for several months between first dispatch and steady sales.
Mistakes that weaken a precipitated silica project report
- No plan for sodium sulphate
By the reaction's chemistry, each tonne of silica leaves roughly 0.7 tonne of sodium sulphate in the wash water. A report without ETP cost, water balance and a disposal or recovery route will not get past the pollution board.
- Pricing every tonne as a tyre grade
Tyre and dispersible grades fetch more, but approvals take long. Year 1 sales should be built on the general rubber, footwear and carrier grades a new plant can sell first.
- Underestimating dryer load
The filter cake is mostly water, and the spray dryer evaporates it with hot air. Fuel cost should be worked out from cake moisture and dryer capacity, not a brochure figure.
- Ignoring wash water quality
Hard water and poor washing leave soluble salts in the product, which fail buyer tests and cause rejected lots.
How NPCS helps you plan a precipitated silica plant
- Route and capacityCompare bought-in, sand-based and ash-based silicate and size the plant for your grades.
- Grade and buyer mappingMatch the grades you plan to make with the buyers and specifications they test against.
- Bank-ready project reportProjections, DSCR and working capital in the format your lender or investor wants.
- Effluent and approvalsWater balance, sodium sulphate handling, plant layout and the approvals list for your state.
NPCS's client list shows 269 assignments in specialty chemicals, including precipitated silica, prepared by the NPCS project team led by founder Ajay Kumar Gupta.
What's inside the precipitated silica sample report
- Introduction
- Uses and applications
- Market potential
- Manufacturing process
- Raw materials
- Plant and machinery
- Land, building and utilities
- Manpower
- Licences and approvals
- Project cost and means of finance
- Working capital
- Projected profitability
- Cash flow statement
- Projected balance sheet
- Depreciation
- Term loan repayment
- Debt service coverage
- Break-even analysis
- Financial ratios
- Key assumptions
- Conclusion
- Monthly loan repayment schedule
18 pages, five-year projections, illustrative figures.
Open sample reportFree sample or a report for your project?
| What you get | Free sample | NPCS report for your project |
|---|---|---|
| Capacity and location | Typical unit | Your capacity, site and state |
| Figures | Illustrative | Built on current prices and quotations |
| Machinery suppliers and quotations | No | Yes |
| Market survey for your region | No | Yes |
| Bank or scheme format (PMEGP, term loan) | No | Yes |
| Use for a loan application | No | Yes |
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Precipitated Silica project report: frequently asked questions
How much does it cost to set up a precipitated silica plant in India?
A 10–15 MT per day plant that buys liquid sodium silicate needs roughly ₹6–12 crore, including land, building and working capital margin. Plants that make their own silicate, or target tyre grades at larger scale, cost much more. Our sample report models a 12 MT per day plant at ₹775 lakh. These ranges are indicative; your report works out the cost for your site.
What raw materials are used to make precipitated silica?
Sodium silicate and sulphuric acid are the two main inputs, with soft process water and small amounts of treatment chemicals. In our sample report sodium silicate solution is 78% of raw material cost and sulphuric acid 17%. Some plants make sodium silicate themselves from silica sand and soda ash, or from rice husk ash and caustic soda.
What is the difference between precipitated silica and fumed silica?
Precipitated silica is made in water, by acidifying sodium silicate, then filtered and dried. Fumed silica is made by burning silicon tetrachloride in a flame, which gives a purer and finer product at a much higher cost. Precipitated silica is the cheaper, high-volume grade used in tyres, footwear, toothpaste and feed.
Is precipitated silica manufacturing profitable?
In our illustrative sample, a 12 MT per day plant earns a 13.4% return on investment in Year 3. It breaks even at about 44% of capacity and pays back in about 4.6 years. Actual results depend on the price you pay for sodium silicate, dryer fuel cost, the grade mix you sell and how fast buyers approve your product.
Which grades should a new precipitated silica plant make first?
Most new plants start with general rubber, footwear and carrier grades, because buyers approve them faster and the surface area window is wider. Tyre grades and highly dispersible silica need tighter process control, granulation and long trial runs with the tyre maker. Toothpaste grades need a cleaner process and separate quality checks.
Can precipitated silica be made from rice husk ash?
Yes. Rice husk ash is digested with caustic soda to make sodium silicate, which is then precipitated with acid in the same way. This route suits sites near rice mills or biomass power plants with steady ash supply. Ash quality, carbon content and colour vary, so the report should test supply and grade before you choose it.
Is the sample project report PDF free, and can I use it for a loan?
The sample is free to view and download. It is an illustrative report that shows the format and depth of an NPCS report. Its figures are representative and not based on a real project, so do not submit it to a bank. For a loan, NPCS prepares a report for your own capacity, location and grades.
Sources and references
- IS 12076:2026 Precipitated silica for rubber industry: specificationBureau of Indian Standards, checked Oct 2026
- Draft revision of IS 12076, precipitated silica for rubber industry (wide circulation draft, April 2025)Bureau of Indian Standards, checked Oct 2026
- Revised categorisation of industries (red, orange, green, white)Maharashtra Pollution Control Board, checked Oct 2026
The NPCS project team, led by Ajay Kumar Gupta
This page and its sample report are prepared and reviewed by the NPCS project team, which has written techno-economic feasibility studies and detailed project reports since 1994.
Ajay Kumar Gupta founded Niir Project Consultancy Services (NPCS) and leads the organisation. With 40 years of experience in MSME project consulting, he has built the team that has delivered more than 28,000 project reports for clients worldwide, helping entrepreneurs plan and finance profitable manufacturing businesses.
- Published
- Last updated
- Next review
- Oct 2027
- Reviewed by
- NPCS project team
This page is reviewed every 12 months, or sooner when scheme limits, GST rates, BIS rules or pollution categories change. The sample report is illustrative: its figures are generated from industry-typical ratios for a unit of this size, checked so every statement balances, and are not taken from any client project.