Detergent and surfactant manufacturers, sulphuric acid plants, and dye intermediate producers use sulphur trioxide directly in sulphonation reactions for products like linear alkylbenzene sulphonate (LABSA).
HSN code 28112950 is classified as Free under India's DGFT ITC(HS) export policy — no export license is required.
This product may be freely exported/imported from India without a license.
HSN Code Details
HSN 28112950 covers sulphur trioxide, a highly reactive anhydride used as the key intermediate in sulphuric acid and sulphonation chemistry.
SO3 is corrosive and moisture-reactive, requiring stainless-steel or lead-lined tank containers with nitrogen blanketing to prevent polymerization in transit; it is classified UN 1829 for hazmat shipping.
Related HSN Codes (Heading 2811)
- 28114 Chemically defined complex acids consisting of a non-metal acid of Sub-Chapter II and a metal acid of Sub-Chapter IV are to be classified in headingFree
- 28111100Hydrogen fluoride (hydrofluoric acid)Free
- 28111200Hydrogen cyanide (hydrocyanic acid)Free
- 281119Other inorganic acids : -- OtherFree
- 28111920(phosphinic acid)Free
- 28111930Acids of arsenicFree
Frequently Asked Questions
No. HSN 28112950 is classified as Free under DGFT ITC(HS) policy, so it can be exported from India without an export license or permit.
Sulphur trioxide (28112950) must ship in moisture-sealed, nitrogen-blanketed tank containers under UN 1829 rules since it reacts violently with atmospheric humidity.
HSN 28112950 falls under Chapter 28 and Heading 2811 of India's customs tariff schedule.
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