Hexamethyldisilazane (CAS 999-97-3): import duty, licences and trade rules in India
Hexamethyldisilazane is an N-silyl compound obtained from ammonia by replacement of two of the hydrogens with trimethylsilyl groups. For trade in India: No ban or licence needed. Normal trade rules apply; handle as its safety advice says. Import duty is about 27.73% (tariff item 2931 (estimate)).
Checked 2026-10-31 against official Indian and international lists. Sources are given under each answer.
Key facts
| CAS number | 999-97-3 |
|---|---|
| Formula | C6H19NSi2 |
| Also called | HMDS, Bis(trimethylsilyl)amine, 1,1,1,3,3,3-Hexamethyldisilazane, Hexamethylsilazane |
| Tariff item (HS) | 2931 (estimate) |
| Total import duty | about 27.73% |
| Anti-dumping duty (most producers) | None found |
| SCOMET (export control) | Not listed |
| NDPS / precursor | Not listed |
Every answer, with its source
Rules in IndiaOK
- Not on the Indian banned-pesticide, drug-precursor, narcotic, psychotropic or new-drug lists we check.
- Normal factory, storage and GST rules still apply.
Exporting from IndiaOK
- Not on the SCOMET export-control list or the precursor export list.
- The buyer’s country may still have its own import rules.
Global treaties & export marketsOK
- 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.
Import dutyOK
- About ₹27,730 duty on every ₹1,00,000 of import value (CIF).
- No tariff line names this chemical, so we worked out its likely heading from its structure: 2931, other organo-inorganic compounds (e.g. organo-phosphorus, organo-silicon) (phosphorus, silicon or boron bonded to carbon).
- All lines under heading 2931 pay basic customs duty 7.5%; with social welfare surcharge and IGST 18% that makes about 27.73%.
- Confirm the exact 8-digit code with your customs broker before you import.
SafetyCHECK
- Catches fire easily
- Burns skin and eyes, eats into metal
- Poisonous, even in small amounts
- Irritates skin, eyes or breathing
- Highly flammable liquid and vapor
- Harmful if swallowed or if inhaled
- Harmful if swallowed
- Toxic in contact with skin
- Causes severe skin burns and eye damage
- Always read the supplier’s safety data sheet (SDS) before handling.
Storage, transport & PESOOK
- Flash point about 20.5 °C (Hazardous Substances Data Bank (HSDB)).
- It is not a hydrocarbon, so the Petroleum Rules do not class it; storage still follows the state fire service’s rules and the factory licence.
- Ships as UN 2924 (Flammable Liquid Corrosive): dangerous-goods rules apply by road, sea (IMDG) and air (IATA), with labels, packaging and a transport document.
Price and suppliersNO DATA
- Post a requirement and we will find suppliers for you.
Questions about Hexamethyldisilazane
What is the import duty on Hexamethyldisilazane in India?
The total import duty on Hexamethyldisilazane is about 27.73% of the import value under tariff item 2931 (estimate), including basic customs duty, the social welfare surcharge and IGST. Check the latest notifications before you import.
Is there anti-dumping duty on Hexamethyldisilazane?
No anti-dumping duty on Hexamethyldisilazane was found in the Customs (ADD) notifications in force.
What is the HS code (tariff item) of Hexamethyldisilazane in India?
Hexamethyldisilazane falls under tariff item 2931 (estimate) of the Customs Tariff of India.
Is Hexamethyldisilazane restricted or licensed in India?
No special Indian ban or licence found. Not on the Indian banned-pesticide, drug-precursor, narcotic, psychotropic or new-drug lists we check. Normal factory, storage and GST rules still apply.
Does exporting Hexamethyldisilazane from India need a licence?
No export licence needed. Not on the SCOMET export-control list or the precursor export list.
Is Hexamethyldisilazane hazardous?
Dangerous: handle with proper protection. Catches fire easily. Burns skin and eyes, eats into metal. Poisonous, even in small amounts.
Is Hexamethyldisilazane 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.