Sulfur trioxide (CAS 7446-11-9): import duty, licences and trade rules in India

Sulfur trioxide is a sulfur oxide. For trade in India: OK to trade, but watch: safety. Import duty is about 27.73% (tariff item 2811 29 50). DGFT policy: import Free, export Free.

OK to trade, but watch: safety.

Checked 2026-10-31 against official Indian and international lists. Sources are given under each answer.

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Key facts

CAS number	7446-11-9
Formula	O3S
Also called	Sulphur trioxide, Sulfur oxide (SO3), CHEBI:29384, Sulfan
Tariff item (HS)	2811 29 50
Total import duty	about 27.73%
Anti-dumping duty (most producers)	None found
DGFT import policy	Free
DGFT export policy	Free
SCOMET (export control)	Not listed
NDPS / precursor	Not listed

Every answer, with its source

Rules in IndiaOK

No ban or licence; import paperwork applies

Not on the Indian banned-pesticide, drug-precursor, narcotic, psychotropic or new-drug lists we check.
Import policy (DGFT ITC(HS)) for tariff item 2811 29 50: Free, so no import licence is needed under trade policy.
On India’s hazardous chemicals list (MSIHC Rules 1989). Importers must send the State authorities the consignment details and full safety information before each import (30 days ahead where possible, never later than the import date) and keep import records.
Holding 15 t or more on one site brings the major-accident rules (notify the site, safety audits, emergency plans); 75t or more also needs a safety report.

Source: CIB&RC pesticide lists · CDSCO new drug approvals · NDPS RCS Order 2013 · DGFT ITC(HS) 2022, Schedule 1 Import Policy · MSIHC Rules 1989 (as amended to 2000)

Exporting from IndiaOK

No export licence needed

Not on the SCOMET export-control list or the precursor export list.
The buyer’s country may still have its own import rules.
Export policy (DGFT ITC(HS)) for tariff item 2811 29 50: Free.

Source: DGFT SCOMET list · NDPS RCS Order 2013 · DGFT ITC(HS) 2022, Schedule 2 Export Policy

Global treaties & export marketsOK

No treaty or export-market restriction found

Not listed by the Stockholm Convention (persistent pollutants), the Rotterdam Convention (prior consent before export) or the Montreal Protocol (ozone layer).
Registered under EU REACH, so EU importers can buy it under an existing registration.
Active on the US TSCA Inventory, so it can be imported into the US without a new-chemical notice.
Listed on the Australian Inventory of Industrial Chemicals (AICIS), so it can be introduced into Australia as an existing industrial chemical.

Source: Stockholm Convention, all listed POPs · Rotterdam Convention Annex III · Montreal Protocol annexes (ozone layer, Kigali HFCs) · US EPA TSCA Inventory · ECHA REACH lists, as published in PubChem

Import dutyOK

About 27.73% of the import value

About ₹27,730 duty on every ₹1,00,000 of import value (CIF).
Made up of basic customs duty 7.5%, social welfare surcharge 0.75% and IGST 18%. IGST can usually be claimed back as input tax credit.
Tariff item 2811 29 50: Sulphur trioxide (sulphuric anhydride).

Source: Customs Tariff of India, CBIC · Notification 45/2025-Customs · Notification 9/2025-Integrated Tax (Rate)

SafetySTOP

Very hazardous: strict controls needed

Burns skin and eyes, eats into metal
Poisonous, even in small amounts
Irritates skin, eyes or breathing
Can cause long-term health damage
Harmful to fish and water life
Causes severe skin burns and eye damage
Causes serious eye damage
Fatal if inhaled
May cause respiratory irritation
Suspected of causing cancer
Always read the supplier’s safety data sheet (SDS) before handling.

Source: PubChem GHS classification

Storage, transport & PESOOK

Dangerous goods for transport

Ships as UN 1829 (Corrosive Poison Inhalation Hazard): dangerous-goods rules apply by road, sea (IMDG) and air (IATA), with labels, packaging and a transport document.

Source: UN numbers (CAMEO Chemicals, via PubChem)

Price and suppliersNO DATA

Not on RasayanXchange yet

Post a requirement and we will find suppliers for you.

Source: RasayanXchange market data

Questions about Sulfur trioxide

What is the import duty on Sulfur trioxide in India?

The total import duty on Sulfur trioxide is about 27.73% of the import value under tariff item 2811 29 50, including basic customs duty, the social welfare surcharge and IGST. Check the latest notifications before you import.

Is there anti-dumping duty on Sulfur trioxide?

No anti-dumping duty on Sulfur trioxide was found in the Customs (ADD) notifications in force.

What is the HS code (tariff item) of Sulfur trioxide in India?

Sulfur trioxide falls under tariff item 2811 29 50 of the Customs Tariff of India.

Is Sulfur trioxide restricted or licensed in India?

No ban or licence; import paperwork applies. Not on the Indian banned-pesticide, drug-precursor, narcotic, psychotropic or new-drug lists we check. Import policy (DGFT ITC(HS)) for tariff item 2811 29 50: Free, so no import licence is needed under trade policy.

Can Sulfur trioxide be imported freely into India?

Under DGFT's ITC(HS) import policy, Sulfur trioxide is Free.

Does exporting Sulfur trioxide from India need a licence?

No export licence needed. Not on the SCOMET export-control list or the precursor export list.

Is Sulfur trioxide hazardous?

Very hazardous: strict controls needed. Burns skin and eyes, eats into metal. Poisonous, even in small amounts. Irritates skin, eyes or breathing.

Is Sulfur trioxide regulated under global treaties or in the EU and US?

No treaty or export-market restriction found. Not listed by the Stockholm Convention (persistent pollutants), the Rotterdam Convention (prior consent before export) or the Montreal Protocol (ozone layer). Registered under EU REACH, so EU importers can buy it under an existing registration.

Related chemicals

Guidance from official lists, not legal advice. Rules change; confirm with DGFT, customs or the regulator before you trade.