TrimethylsilaneCAS 993-07-7 · import duty, licences and trade rules in India
For trade in India: OK to trade, but watch: storage, transport & PESO. Import duty is about 27.73% (tariff item 2931 90 (subheading)).
Checked 2026-11-12 against official Indian and international lists. Sources are given under each answer.
What Trimethylsilane is, its uses, properties and related chemicals: Trimethylsilane on ChemXpress →
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.
Import dutyOK
- About ₹27,730 duty on every ₹1,00,000 of import value (CIF).
- The EU customs inventory (ECICS) classifies it under CN 2931 90 00, so its HS subheading is 2931 90.
- India splits subheading 2931 90 into 9 lines: 2931 90 11 (Organo-arsenic compounds › Methylarsonic acid and its salt); 2931 90 12 (Organo-arsenic compounds › Cacodylic acid and its salt); 2931 90 13 (Organo-arsenic compounds › p-Aminophenylarsonic acid and its salt); 2931 90 14 (Organo-arsenic compounds › Amino-hydroxyphenylarsonic acids, their formyl and ac); 2931 90 15 (Organo-arsenic compounds › Arsenobenzene and its derivatives); 2931 90 19 (Organo-arsenic compounds › Other); and 3 more.
- Basic customs duty 7.5% on every one of them; with social welfare surcharge and IGST 18% that makes about 27.73%.
- Lines that name a chemical are for that chemical; one that no line names goes under "Other" (2931 90 19, 2931 90 90).
- Confirm the exact 8-digit line with your customs broker before you import.
SafetyCHECK
- Catches fire easily
- Gas under pressure
- Irritates skin, eyes or breathing
- Extremely flammable gas
- Extremely flammable liquid and vapor
- Contains gas under pressure; may explode if heated
- Causes skin irritation
- Causes serious eye irritation
- Always read the supplier’s safety data sheet (SDS) before handling.
Storage, transport & PESOCHECK
- A gas under pressure: filling, storing or transporting it in cylinders needs PESO approval, and large storage tanks need a licence under the SMPV(U) Rules.
Price and suppliersNO DATA
- Post a requirement and we will find suppliers for you.
Key facts
| CAS number | 993-07-7 |
|---|---|
| Formula | C3H10Si |
| Also called | 2-Methyl-2-silapropane, Silane, trimethyl-, Trimethylsilane, Trimethysilane |
| Tariff item (HS) | 2931 90 (subheading) |
| Total import duty | about 27.73% |
| Anti-dumping duty (most producers) | None found |
| SCOMET (export control) | Not listed |
| NDPS / precursor | Not listed |
Questions about Trimethylsilane
What is the import duty on Trimethylsilane in India?
The total import duty on Trimethylsilane is about 27.73% of the import value under tariff item 2931 90 (subheading), including basic customs duty, the social welfare surcharge and IGST. Check the latest notifications before you import.
Is there anti-dumping duty on Trimethylsilane?
No anti-dumping duty on Trimethylsilane was found in the Customs (ADD) notifications in force.
What is the HS code (tariff item) of Trimethylsilane in India?
Trimethylsilane falls under HS subheading 2931 90, as classified by the EU customs inventory (ECICS). India splits that subheading into several 8-digit lines; confirm the exact line with your customs broker.
Is Trimethylsilane 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 Trimethylsilane from India need a licence?
No export licence needed. Not on the SCOMET export-control list or the precursor export list.
Is Trimethylsilane hazardous?
Dangerous: handle with proper protection. Catches fire easily. Gas under pressure. Irritates skin, eyes or breathing.
Is Trimethylsilane 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.