Toll manufacturing means a plant processes raw materials for you, to your process, and charges a conversion fee rather than selling you a finished product at its own price. You usually supply some or all of the raw materials and own the product throughout. Many Indian chemical plants offer toll work, especially in Gujarat.
It is different from custom synthesis, where the plant often develops the process and sells you the product. See custom synthesis and protecting your process.
When toll manufacturing makes sense
- You have a proven process but no capacity, or no plant in a lower-cost location.
- You control a key raw material and want to keep ownership of it.
- You need to test a product in the market before building your own plant.
- You want a second production site for supply security.
What Indian plants offer
Gujarat has many batch plants with multipurpose reactors that can switch products. Some run regular toll work for overseas companies. Capabilities vary widely: some handle hazardous reactions such as nitration, hydrogenation or chlorination, while others only blend or dry.
Toll arrangements also raise Indian customs and tax questions when you send raw materials into India and take the product out. Ask the plant and an Indian tax adviser how imports, duty and GST will be handled before you start.
What to agree in writing
- The process, with a technical package and acceptable variations.
- Who supplies each raw material, and how it is tested on arrival.
- The expected yield, and what happens if the plant falls short.
- The finished product specification and test methods.
- Ownership of materials, product, waste and any by-products.
- Handling of effluent and waste, which must be within the plant's consent.
- Confidentiality, and limits on using your process for others.
- Your right to audit and to have a person on site during production.
The main risks
Yield losses are the most common dispute. If the plant reports a lower yield than expected, you lose raw material you paid for. Agree how yield is measured and reconciled for each batch.
Leakage of know-how is the second risk. A plant that learns your process may use it for others. Contracts help, but so does sharing only what is needed. The pollution consent is the third risk: the plant must be licensed for the product and its quantities. A plant audit checks all three.
Running the first campaign
Treat the first toll campaign as a trial. Run one or two batches first, with your own technical person on site. Check raw material receipt, batch records, in-process tests and final results. Reconcile every kilogram of raw material against product, waste and losses. Only then commit to a longer campaign. The first campaign also shows how the plant handles problems, which tells you more about the relationship than any presentation.
Next step
We find plants with the right reactors and licences, audit them and supervise production. Book a free sourcing review.