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Metals, alloys and elements

Boron

Also known as Boron, elemental, Boron 11, Dietary Boron

CAS 7440-42-8Formula BMolar mass 10.81 g/molEC 231-151-2
GHS signal word: Warning. Pictograms: Harmful or irritant 67 suppliers listed Drug substance
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Element with atomic number and standard atomic weight

Key facts

What buyers check first

All properties
Appearance
Polymorphic: alpha-rhombohedral form, clear red crystals, beta-rhombohedral form, black,…
Melting point
2,075 °C
Boiling point
4,000 °C
Density
Amorphous, 2.350 g/cm³, alpha-rhombohedral, 2.46 g/cm³, alpha-tetragonal, 2.31 g/cm³, be…
Solubility
Insoluble in water, unaffected by aqueous hydrochloric and hydrofluoric acids, when fine…
HS code
280450
Category
Metals, alloys and elements
Illustrative photo, colourless crystals in an open woven sack in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is Boron?

Plain description, key identifiers and synonyms

Boron atom is a metalloid atom, a nonmetal atom and a boron group element atom. It has a role as a micronutrient.

Boron is a chemical element with symbol B and atomic number 5.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
boron
CAS number
7440-42-8 CAS number cross-checkedOther or deprecated CAS: 13766-26-2, 14798-13-1, 35325-82-7
EC numbers
231-151-2, 689-761-3
Molecular formula
B
UNII
N9E3X5056Q
MDL number
MFCD00134034
InChIKey
ZOXJGFHDIHLPTG-UHFFFAOYSA-N
InChI
InChI=1S/B
SMILES (canonical and isomeric)
[B]

Synonyms

  • Boron, elemental
  • Boron 11
  • Dietary Boron
  • Boron-11
  • Borane-d3
  • boron atom
  • Boron powder
  • Boron element
  • Boron, Amorphous Powder
  • Boron, metallic
  • Boron, Amorphous
  • Boron AA Standard: B @ 1000 microg/mL in H2O
  • Boron powder (1~2 micron)
  • Boron Hollow Cathode Lamp: 1.5" Diameter, 2-pin, Non-Coded
  • Boron Hollow Cathode Lamp: 2.0" Diameter, 4-pin, Cableless
  • Boron Hollow Cathode Lamp: 2.0" Diameter, 9-pin, Non-Coded
  • Boron-elemental
  • ICP standard Boron H2O 1000 microg/mL
  • Boron Standard: B @ 10 microg/mL in H2O
  • Boron Standard: B @ 1000 microg/mL in H2O
  • Boron - B @ 1000 microg/g in Hydrocarbon Oil
  • Boron - B @ 5000 microg/g in Hydrocarbon Oil
  • Boron Standard: B @ 1000 microg/mL in NH4OH
  • Boron Standard: B @ 10000 microg/mL in NH4OH
  • Boron Standard: B @ 2500 mg/Kg in 75 cSt oil
Show all 38 synonyms
  • boracium
  • boranylidene
  • bore
  • Borfast
  • Borotrac
  • Bortrac
  • monomer boron
  • Boron solution
  • Boron Nanorods
  • Boron Standard
  • Atomic Boron
  • Element Boron
  • Element:Boron

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Appearance
Polymorphic: alpha-rhombohedral form, clear red crystals, beta-rhombohedral form, black, alpha-tetragonal form, blackexp.
Melting point
2,075 °Cexp.
Boiling point
4,000 °Cexp.
Density
Amorphous, 2.350 g/cm³, alpha-rhombohedral, 2.46 g/cm³, alpha-tetragonal, 2.31 g/cm³, beta-rhombohedral, 2.35 g/cm³exp.
Autoignition temperature
580 °Cexp.
Solubility
Insoluble in water, unaffected by aqueous hydrochloric and hydrofluoric acids, when finely divided it is soluble in boiling nitric and sulfuric acids and in molten metals such as copper, iron, magnesium, aluminum, calcium, reacts…exp.
Vapour pressure
1.56 × 10⁻⁵ atm (0.0119 mm Hg) at 2140 °Cexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
10.81 g/molcalc.
Exact mass
11.0093 Dacalc.
LogP (octanol/water)
-0.38calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
0calc.
Heavy atoms
1calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Warning
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H302Harmful if swallowed.
Precautionary statements (5)
  • P264Wash skin thoroughly after handling.
  • P270Do not eat, drink or smoke when using this product.
  • P301 + P317If swallowed: Get medical help.
  • P330Rinse mouth.
  • P501Dispose of contents and container in accordance with local regulations.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Boron suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 67 suppliers
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Where suppliers are based

67 suppliers in 10 countries

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Boron price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

In nuclear chemistry as neutron absorber, in Ignitron rectifiers, in alloys, usually to harden other metals.

Boron-10 (isotope): As shield for nuclear radiation and in instruments used for detecting neutrons.

Deoxidizer in nonferrous metallurgy, grain refiner in aluminum, in delayed action fuses, igniter in radio tubes, coating material in solar batteries.

Industrial uses: Other, Alloys, Stabilizing agent, Propellants, non-motive (blowing agents).

Consumer uses: Propellants, non-motive (blowing agents), Alloys, Other.

Use classes: Inorganic substances.

Pharmacological actions

  • Trace Elements

Roles

  • food component
  • micronutrient
  • nutrient
  • physiological role

Functional uses

  • Dispersing agent
  • Wetting agent (non-aqueous)

Pharmacology

Boron is an element with atomic symbol B, atomic number 5, and atomic weight 11.

How it is made

Boron is produced by the chemical reduction of boron compounds with reactive metals, either by nonaqueous electrolytic reduction or through thermal decomposition. Higher purified boron is produced by zone-refining or other thermal techniques.

First obtained by Moissan in 1895 by reduction of boric anhydride (B2O3) with magnesium in a thermite-type reaction, still good method for large quantities of relatively impure boron.

Of high purity crystalline boron by vapor phase reduction of boron trichloride with hydrogen on electrically heated filaments in a flow system.

Regulatory status

Inventories, regulations and trade controls that list this substance

Health and food

  • Active ingredient in FDA approved drug labels

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Boron is traded under.

HS 2804.50Exact HS code

Boron, tellurium

World exports in 2024
$220M
+31.2% vs 2023, imports $197M
2019 to 2024
Top exporters
  1. China30.8%
  2. Canada19.6%
  3. United States7.4%
Top importers
  1. Germany30.4%
  2. Canada19.8%
  3. Hong Kong15.8%
Reported customs values in USD, not prices.Full trade data

The HS code shown for Boron is indicative (it was matched by name in the HS nomenclature). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Boron, based on the data on this page

What is Boron?

Boron atom is a metalloid atom, a nonmetal atom and a boron group element atom. It has a role as a micronutrient.

What is the CAS number of Boron?

The CAS registry number of Boron is 7440-42-8. Other or deprecated CAS numbers: 13766-26-2, 14798-13-1, 35325-82-7.

What is the molecular formula and weight of Boron?

The molecular formula of Boron is B and its molar mass is 10.81 g/mol.

What is Boron used for?

In nuclear chemistry as neutron absorber, in Ignitron rectifiers, in alloys, usually to harden other metals. Boron-10 (isotope): As shield for nuclear radiation and in instruments used for detecting neutrons.

Is Boron hazardous?

Boron carries the GHS signal word "Warning". Main hazards: harmful if swallowed. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Boron?

Boron is usually classified under HS code 280450 (Boron, tellurium). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Boron?

CompoundList lists 67 suppliers of Boron in United States, China, India, Germany and 6 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Boron in India?

10 suppliers in India list Boron on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Boron?

Suppliers quote Boron on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Boron

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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