Substance profile
Boron Trichloride
Boron Trichloride is a gas at room temperature with a pungent, irritating odor.
01 · Identification
What Boron Trichloride is
Boron Trichloride is a gas at room temperature with a pungent, irritating odor. It boils at 12.5 °C, melts at -107 °C.
Under the GHS it carries the signal word Danger. It is classed as corrosives.
02 · Identifiers
Boron Trichloride identifiers and molecular data
Boron Trichloride CAS number and EC number
Boron Trichloride molecular formula and molecular weight
03 · GHS classification
Boron Trichloride hazard classification
Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.
Boron Trichloride pictograms and signal word
Boron Trichloride hazard class and category
| Hazard class | Category | From code | Pictogram |
|---|---|---|---|
| Acute toxicity - oral GHS chapter 3.1 | Category 1 or 2 | H300 | GHS06 |
| Acute toxicity - inhalation GHS chapter 3.1 | Category 1 or 2 | H330 | GHS06 |
| Skin corrosion/irritation GHS chapter 3.2 | Category 1A or 1B or 1C | H314 | GHS05 |
Where two values are shown with “or”, the hazard statement is shared by more than one category or by more than one class, and the code alone does not say which. H272, for example, belongs to oxidising liquids and to oxidising solids — the physical state decides. The binding answer for a specific entry is in the CLP Annex VI table itself.
Boron Trichloride hazard statements (H-codes)
| Code | Hazard statement |
|---|---|
| H330 | Fatal if inhaled. |
| H300 | Fatal if swallowed. |
| H314 | Causes severe skin burns and eye damage. |
Boron Trichloride supplemental EU statements (EUH)
| Code | Statement |
|---|---|
| EUH014 | Reacts violently with water. |
This page lists only the codes assigned to Boron Trichloride. The full reference lives on the hazard statements hub, the precautionary statements hub and the GHS pictograms hub.
Safety Data Sheet
Getting an SDS for Boron Trichloride
A Safety Data Sheet is written for a product, not for a substance: the supplier of the grade you actually buy issues it, so two suppliers of Boron Trichloride issue two different sheets. That is why there is no single authoritative SDS for a substance to download — what there is, is the job of collecting the sheets for the products you hold and keeping them current as suppliers revise them.
04 · Precautionary statements
Boron Trichloride precautionary statements
CLP Annex VI assigns 9 precautionary statements to Boron Trichloride. They are grouped the way a label groups them: what to do before handling, what to do when something has already happened, how to store it and how to dispose of it.
Prevention
What to do before and during handling so the hazard never happens.
Response
What to do once exposure, spillage or fire has already happened.
Reading the notation. … is a blank the supplier fills in — not a truncated sentence.· [square brackets] mark a part printed only when it applies.
05 · Names in the regulation
Boron Trichloride name in 23 EU languages
CLP Annex VI Part 3 is published in every language edition of the regulation, and the identification column is written out in each of them. Nothing below is translated by us: each line is the name as that edition prints it. Under Art. 18(2) the substance name from Annex VI is a lawful product identifier, so this is the wording to put on a label going to that market — and where the cell lists several designations, any one of them qualifies.
| Language | Name in CLP Annex VI Part 3 |
|---|---|
| Bulgarian български | борен трихлорид |
| Spanish español | Tricloruro de boro |
| Czech čeština | chlorid boritý |
| Danish dansk | bortriclorid |
| German Deutsch | Bortrichlorid |
| Estonian eesti | boortrikloriid |
| Greek ελληνικά | τριχλωριούχο βόριο |
| English English | boron trichloride |
| French français | trichlorure de bore |
| Croatian hrvatski | borov triklorid |
| Italian italiano | tricloruro di boro |
| Latvian latviešu | bora trihlorīds |
| Lithuanian lietuvių | boro trichloridas |
| Hungarian magyar | bór-triklorid |
| Maltese Malti | triklorur tal-boron |
| Dutch Nederlands | boortrichloride |
| Polish polski | trichlorek boru |
| Portuguese português | tricloreto de boro |
| Romanian română | triclorură de bor |
| Slovak slovenčina | chlorid boritý |
| Slovenian slovenščina | borov triklorid |
| Finnish suomi | booritrikloridi |
| Swedish svenska | bortriklorid |
All 23 language editions of Annex VI carry this entry. Irish is the twenty-fourth official EU language and has no line here for a different reason: no consolidated CLP text has ever been published in Irish, so there is no Irish edition of Annex VI to quote a name from. Source: consolidated CLP, CELEX 02008R1272, language editions. © European Union, https://eur-lex.europa.eu — only the electronic Official Journal of the European Union is authentic.
06 · Label elements
Boron Trichloride GHS label elements
Everything CLP Annex VI fixes for Boron Trichloride, laid out the way it appears on a label. The greyed lines are the parts only the supplier can fill in.
Danger
Boron Trichloride
- Fatal if inhaled.
- Fatal if swallowed.
- Causes severe skin burns and eye damage.
- Reacts violently with water.
- Do not breathe dust/fume/gas/mist/vapours/spray.
- Do not eat, drink or smoke when using this product.
- Use only outdoors or in a well-ventilated area.
- Wear protective gloves/protective clothing/eye protection/face protection/hearing protection/…
- IF SWALLOWED:
- IF INHALED:
- Immediately call a POISON CENTER/doctor/…
- Rinse mouth.
- Do NOT induce vomiting.
Supplier name, address and telephone number· Product identifier·Nominal quantity
Need this as an actual label? Open Boron Trichloride in the GHS label constructor →
07 · Health hazards
Boron Trichloride health hazards and exposure limits
Boron Trichloride hazard summary
Corrosive to skin; [Quick CPC] A corrosive substance that can cause injury to skin, eyes, and respiratory tract; Rapidly evaporating liquid can cause frostbite; High inhalation exposure can cause pulmonary edema; [ICSC] Reacts violently with water evolving hydrochloric acid and boric acid; Also forms hydrochloric acid on contact with moisture in air and soil; Corrosive and toxic; [CAMEO] Reacts violently with water producing a visible vapor cloud; Short-term exposure causes second- and third-degree skin burns and severe eye injury; Inhalation can cause edema and severe upper respiratory tract irritation; Vapors are intolerable even at low concentrations; [CHRIS]
Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
08 · Physical and chemical properties
Boron Trichloride properties
Every value is shown with the conditions it was measured under and the source it came from. Where sources disagree, all values are listed rather than one being picked — the difference is usually a different form of the substance, not an error.
Boron Trichloride boiling point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Boiling point | 12.5 °C (54.5 °F) | HSDB | |
| 12.5 °C (54.5 °F) | at 760 mmHg | CAMEO |
Boron Trichloride melting point
| Property | Value | Conditions | Source |
|---|---|---|---|
| Melting point | -107.3 °C (-161.1 °F) | HSDB | |
| -107.22 °C (-161 °F) | CAMEO | ||
| -107 °C (-160.6 °F) | ICSC |
Boron Trichloride density
| Property | Value | Conditions | Source |
|---|---|---|---|
| Density | 0.0048 g/cm³ | HSDB | |
| 1.35 g/cm³ | ICSC | ||
| 1.35 g/cm³ | at 12 °C | CAMEO |
Boron Trichloride solubility
| Property | Value | Conditions | Source |
|---|---|---|---|
| Solubility | Solubility in water: reaction | ICSC |
Boron Trichloride vapor pressure
| Property | Value | Conditions | Source |
|---|---|---|---|
| Vapor pressure | 1125 mmHg | at 20 °C | ICSC |
| 1245 mmHg | at 27 °C | HSDB | |
| 1250 mmHg | at 27 °C | DOE PAC |
Boron Trichloride lower explosive limit (LEL)
| Property | Value | Conditions | Source |
|---|---|---|---|
| Lower explosive limit (LEL) | ... May ... explode in moist air ... | Boranes | HSDB |
Boron Trichloride vapor density
| Property | Value | Conditions | Source |
|---|---|---|---|
| Vapor density | 4.03 (air = 1) | HSDB |
Boron Trichloride critical temperature and pressure
| Property | Value | Conditions | Source |
|---|---|---|---|
| Critical temperature and pressure | 181.85 °C (359.3 °F) | HSDB |
Boron Trichloride corrosivity
| Property | Value | Conditions | Source |
|---|---|---|---|
| Corrosivity | It is corrosive to metals | HSDB | |
| Vigorously attacks elastomers and packing materials | HSDB | ||
| Strong irritant to tissue. Fumes are corrosive and toxic | HSDB |
Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.
09 · Fire and explosion
Boron Trichloride fire and explosion behaviour
These are descriptions rather than measured values, so they are kept out of the table above and quoted here with the source that reported them.
Boron Trichloride fire potential
Not flammable
Source: Hazardous Substances Data Bank (HSDB)
Fire and explosion
A trap should always be used when transferring the liquid or gas into a solution to prevent impurities from being sucked back into the cylinder, which might create an explosive mixture.
Source: HSDB
A boron trichloride cylinder contains a large amount of liquid and should never be permitted to become overheated. If the container is completely filled with liquid, an increase in temperature could build up tremendous pressure and cause the cylinder to burst. For this reason closed containers such as cylinders should be filled only by experts ...
Source: HSDB
10 · Handling and storage
Boron Trichloride storage and handling
Boron Trichloride safe storage
Fireproof if in building. Separated from food and feedstuffs. See Chemical Dangers.
Source: ILO-WHO International Chemical Safety Cards (ICSCs)
Boron Trichloride storage conditions
Fireproof if in building. Separated from food and feedstuffs.
Source: Hazardous Substances Data Bank (HSDB)
Boron Trichloride incompatible materials
Boron trichloride reacts energetically with nitrogen peroxide, phosphine, or fat and grease.
Source: Hazardous Substances Data Bank (HSDB)
Boron Trichloride reactivity
BORON TRICHLORIDE vigorously attacks elastomers and packing materials. Contact with Viton, Tygon, Saran and natural and synthetic rubbers is not recommended. Highly corrosive to most metals in the presence of moisture. Reacts energetically with nitrogen dioxide/dinitrogen tetraoxide, aniline, phosphine, triethylsilane, or fat and grease [Mellor 5:132 1946-47]. Reacts exothermically with chemical bases (examples: amines, amides, inorganic hydroxides).
Source: CAMEO Chemicals
Planning storage for a mix of chemicals? Check Boron Trichloride in the storage compatibility matrix →
11 · Transport
Boron Trichloride UN number and transport classification
Transport classification is a separate system from the GHS classification above. It decides how a package is marked and how a load may be carried; it does not follow from the workplace label, and the workplace label does not follow from it. The entries below are linked by CAS number, never by name.
Boron Trichloride under UN 1741 — shipping name, class and packing group
Europe · ADR 2025, Table A
| Proper shipping name (3.1.2) | Class | Classification code | PG | Labels (column 5) |
|---|---|---|---|---|
| BORON TRICHLORIDE | 2 | 2TC | — | |
Source: ADR 2025, Table A of Chapter 3.2 · ECE/TRANS/352 Vol. I (UNECE). Class 2 is “Gases” (ADR 2.1.1.1).
United States · 49 CFR 172.101 Hazardous Materials Table
| Proper shipping name (column 2) | Class or division | PG | Labels (column 6) |
|---|---|---|---|
| Boron trichloride | 2.3 | — | |
Source: 49 CFR 172.101 Hazardous Materials Table · eCFR, revision 2026-08-03. Class 2.3 is “Poisonous gas” (49 CFR 173.2).
12 · Questions
Boron Trichloride — frequently asked questions
What is the CAS number of Boron Trichloride?
The CAS number of Boron Trichloride is 10294-34-5. Its EC number is 233-658-4.
What does a Boron Trichloride label have to show?
Under CLP Annex VI the label for Boron Trichloride carries the pictograms Gas cylinder, Skull and crossbones and Corrosion and the signal word is Danger.
Is Boron Trichloride flammable?
CLP Annex VI assigns Boron Trichloride no flammability hazard class. That is not a statement that it cannot burn: the harmonised list only records the hazards that were assessed for it.
Is Boron Trichloride a carcinogen?
CLP Annex VI records no harmonised carcinogenicity classification for Boron Trichloride. Annex VI is a list of agreed classifications, not a list of substances found safe, so this is an absence of a classification rather than a clean bill of health.
What is the boiling point of Boron Trichloride?
The boiling point reported for Boron Trichloride is 12.5 °C (54.5 °F) (HSDB).
What is the melting point of Boron Trichloride?
The melting point reported for Boron Trichloride is -107.3 °C (-161.1 °F) (HSDB).
How should Boron Trichloride be stored?
Fireproof if in building. Separated from food and feedstuffs. (Hazardous Substances Data Bank (HSDB))
Nearby
Substances next to Boron Trichloride
Keep going: substances starting with B, or search the whole database by name, CAS number, pictogram or signal word.