Soda ash from India is made in Gujarat by a small number of large producers, and Mithapur soda ash from the Saurashtra coast is one of the best-known origins. For soda ash for glass, buyers usually ask for dense grade, and for soda ash for detergent, light or dense depending on the process. Either way, name the grade, sodium carbonate content and bulk density.
Because few plants make soda ash at scale, a soda ash supplier in India may be a producer, a distributor or an exporter buying from producers. Ask which it is.
What are light and dense soda ash?
Both are sodium carbonate. The difference is physical: dense ash has larger, heavier particles and a higher bulk density, and light ash is finer and fluffier. Soda ash, light and dense explains it, and how soda ash is made in Gujarat shows how to find a producer.
Which grade for glass?
Glass makers generally use dense soda ash because it handles well in batch plants and dusts less. The specification should cover sodium carbonate content, iron oxide (low iron matters for clear glass), chloride, sulphate and particle size distribution. Ask the supplier for typical and guaranteed values, and ask what range the particle size falls in, because segregation in the batch house causes melt problems.
Which grade for detergent?
Detergent makers use soda ash as a builder and alkalinity source. Light ash dissolves faster, and dense ash flows better and takes up less space. Which is better depends on your mixing or spray-drying process, so test both. Key parameters are sodium carbonate content, bulk density, particle size and the chloride and iron levels. For the dry blend, moisture and caking tendency also matter.
What should you check at the supplier?
- The producer's identity, with proof that the lot comes from its plant.
- A certificate of analysis for the actual lot, showing sodium carbonate, chloride, iron, insolubles and density.
- Packing: 25 kg or 50 kg bags, one-tonne jumbo bags or bulk, and how each is sealed against moisture.
- Loading supervision, because soda ash absorbs moisture and cakes if exposed.
How is it shipped?
Soda ash is not usually treated as dangerous goods for sea transport, but confirm this with the shipper under the current regulations. Small buyers ship in containers, and larger ones consider bulk vessels. Bulk mineral freight options compares the choices. Put the moisture limit and loading conditions into the contract, as set out in what a chemical purchase contract should include.
What can go wrong with soda ash cargo?
The common problems are moisture, caking and contamination. Soda ash absorbs water from the air, so torn bags, damp containers or a delayed loading can leave you with lumps that do not flow in the batch house. Contamination from a previous cargo in a bulk hold or container is the other risk. Ask for container inspection before loading, a moisture limit in the contract and photographs of the loading. A pre-shipment sample tested by an independent laboratory is a cheap safeguard compared with a rejected lot.
Next step
We confirm the grade you need, find producers that can supply it, check samples and have the lot tested and loaded under supervision. We work only for the buyer, for one written fee agreed in advance. Book a free sourcing review, or see what we source in chemicals.