Soda ash (sodium carbonate, Na2CO3, CAS 497-19-8) is a basic raw material for glass, detergents and many chemicals. It is traded in two main forms, dense and light, and the choice affects handling, dosing and cost.
What makes the difference
Both grades are sodium carbonate. The difference is physical: bulk density and particle structure. Dense soda ash is granular with a bulk density of roughly 1.0 g/cm3, while light soda ash is a fine powder at roughly 0.5 to 0.65 g/cm3. Exact figures vary by producer, so check the TDS.
Where each grade is used
- Dense: glass manufacturing, where granules reduce dust and keep the batch mixture from separating.
- Light: detergents and cleaning powders, chemical production and water treatment, where fast dissolving and reactivity help.
Specification points to compare
- Total alkali as Na2CO3, commonly 99.2 percent minimum
- Sodium chloride (NaCl) and iron (Fe2O3)
- Loss on ignition and moisture
- Bulk density and sieve analysis (particle size distribution)
Packaging and transport
Soda ash ships in 25 kg or 50 kg bags, jumbo bags and in bulk. It is generally not regulated as a dangerous good in transport, but it is an eye irritant, so the handling instructions in the MSDS still apply. Keep it dry, because soda ash absorbs moisture and cakes. The customs heading is usually 2836.20.
