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Metals, alloys and elements

Strontium

Also known as Strontium, elemental, SR, Strontium Metallicum

CAS 7440-24-6Formula SrMolar mass 87.62 g/molEC 231-133-4
GHS signal word: Danger. Pictograms: Flammable, Corrosive, Harmful or irritant, Serious health hazard 70 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
Silvery white metal, face-centered cubic structure
Melting point
752 °C
Boiling point
1,390 °C
Density
2.54 g/cm³
Solubility
Solubility in water: reaction
HS code
280519
Category
Metals, alloys and elements
Illustrative photo, metallic grey powder in a glass bottle on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is Strontium?

Plain description, key identifiers and synonyms

Strontium atom is an alkaline earth metal atom.

Strontium is a chemical element with symbol Sr and atomic number 38.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
strontium
CAS number
7440-24-6 CAS number cross-checkedOther or deprecated CAS: 10098-97-2, 13967-73-2, 13982-14-4, 13982-64-4, 14119-10-9, 14158-27-1, 14331-91-0, 14809-49-5
EC number
231-133-4
Molecular formula
Sr
UNII
YZS2RPE8LE
MDL number
MFCD00011247, MFCD00134060
InChIKey
CIOAGBVUUVVLOB-UHFFFAOYSA-N
InChI
InChI=1S/Sr
SMILES (canonical and isomeric)
[Sr]

Synonyms

  • Strontium, elemental
  • SR
  • Strontium Metallicum
  • strontium atom
  • Atomic Strontium
  • Strontium element
  • estroncio
  • Strontium, distilled dendritic pieces
  • Strontium Standard: Sr @ 1000 microg/mL in 5% HNO3
  • Strontium Standard: Sr @ 10000 microg/mL in 5% HNO3
  • Strontium AA Standard: Sr @ 1000 microg/mL in 5% HNO3
  • Strontium Standard: Sr @ 1000 microg/g in Hydrocarbon Oil
  • Strontium Standard: Sr @ 5000 microg/g in Hydrocarbon Oil
  • Ion Chromatography Standard: Strontium @ 100 microg/mL in H2O
  • strontium metal
  • Strontium pieces
  • Sulfur-Free Cobalt Concentrate: Co @ approx. 3 wt% in Hydrocarbons
  • Element-Sr
  • Element:Sr
  • Sulfur-Free Strontium Concentrate: Sr @ approx. 9 wt% in Hydrocarbons
  • Element Strontium
  • Element:Strontium
  • Sr (element)
  • Strontium (atomic)
  • Strontium (element)
Show all 35 synonyms
  • Sr Standard Solution
  • (~86~Sr)strontium
  • 38Sr
  • Strontium pieces, dendritic
  • Strontium, 99%
  • Strontium, random pieces, 99%
  • Strontium-90 Radioactivity Standard
  • Ion Chromatography Cation Std Strontium
  • (Sr1.145 Ti S3).873
  • Strontium granules, 19mm (0.76in) & down

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
Silvery white metal, face-centered cubic structureexp.
Melting point
752 °Cexp.
Boiling point
1,390 °Cexp.
Density
2.54 g/cm³exp.
Solubility
Solubility in water: reactionexp.
Vapour pressure
4.99 × 10⁻¹¹ Pa at 400 K, 0.000429 Pa at 600 K, 1.134 Pa at 800 K, 121 Pa at 1000 Kexp.

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
87.62 g/molcalc.
Exact mass
87.9056 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
Danger
GHS02: Flammable
Flammable
GHS05: Corrosive
Corrosive
GHS07: Harmful or irritant
Harmful or irritant
GHS08: Serious health hazard
Serious health hazard

Hazard statements

  • H260In contact with water releases flammable gases which may ignite spontaneously.
  • H314Causes severe skin burns and eye damage.
  • H315Causes skin irritation.
  • H318Causes serious eye damage.
  • H360DMay damage the unborn child.
Precautionary statements (24)
  • P203Obtain, read and follow all safety instructions before use.
  • P223Do not allow contact with water.
  • P231 + P232Handle and store contents under inert gas. Protect from moisture.
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P330 + P331If swallowed: Rinse mouth. Do not induce vomiting.
  • P302 + P335 + P334If on skin: Brush off loose particles from skin. Immerse in cool water or wrap in wet bandages.
  • P302 + P352If on skin: Wash with plenty of water.
  • P302 + P361 + P354If on skin: Take off immediately all contaminated clothing. Immediately rinse with water for several minutes.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P354 + P338If in eyes: Immediately rinse with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P316Get emergency medical help immediately.
  • P317Get medical help.
  • P318If exposed or concerned, get medical advice.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P332 + P317If skin irritation occurs: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P363Wash contaminated clothing before reuse.
  • P370 + P378In case of fire: Use appropriate media to extinguish.
  • P402 + P404Store in a dry place. Store in a closed container.
  • P405Store locked up.
  • 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

Strontium suppliers

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Where suppliers are based

70 suppliers in 16 countries

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Strontium 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 fireworks, in red signal flares, on tracer bullets. Eutectic modifier in Al-Ag casting alloys to improve strength and ductility. Innoculant in ductile iron casting to control graphite formation.

Added to alloys of tin and lead to add hardness and durability, deoxidizer in copper and bronze.

Alloys, "getter" in electron tubes.

Igneous coloring agent, material for cathode of vacuum bulb, material for condenser, optical glass, lead removing agent, iron removing agent.

Industrial uses: Intermediate, Alloys.

Consumer uses: Intermediate, Other, Alloys.

Use classes: Inorganic substances, Radionuclides.

Roles

  • analgesic
  • bone density conservation agent
  • pharmaceutical

Pharmacology

Strontium is an element with atomic symbol Sr, atomic number 38, and atomic weight 87.62.

How it is made

Thermal reduction of the oxide with metallic aluminum (strontium aluminum alloy formed), and distilling the strontium in a vacuum.

Variant of the Pidgeon process: reaction of strontium oxide and aluminum is produced under vacuum where the strontium evolves as a gas and is transported through the production retort to a cooler end where it precipitates as a solid.

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 Strontium is traded under.

HS 2805.19Indicative HS code

Alkali or alkaline-earth metals, other

World exports in 2024
$574M
−11.1% vs 2023, imports $558M
2019 to 2024
Top exporters
  1. France * partner reported58.4%
  2. China19.1%
  3. Germany13.1%
Top importers
  1. Germany59.4%
  2. United States7.9%
  3. France * partner reported4.7%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Strontium is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

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

What is Strontium?

Strontium atom is an alkaline earth metal atom.

What is the CAS number of Strontium?

The CAS registry number of Strontium is 7440-24-6. Other or deprecated CAS numbers: 10098-97-2, 13967-73-2, 13982-14-4.

What is the molecular formula and weight of Strontium?

The molecular formula of Strontium is Sr and its molar mass is 87.62 g/mol.

What is Strontium used for?

In fireworks, in red signal flares, on tracer bullets. Eutectic modifier in Al-Ag casting alloys to improve strength and ductility. Innoculant in ductile iron casting to control graphite formation. Added to alloys of tin and lead to add hardness and durability, deoxidizer in copper and bronze.

Is Strontium hazardous?

Strontium carries the GHS signal word "Danger". Main hazards: in contact with water releases flammable gases which may ignite spontaneously, causes severe skin burns and eye damage, causes skin irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Strontium?

Strontium is usually classified under HS code 280519 (Alkali or alkaline-earth metals, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Strontium?

CompoundList lists 70 suppliers of Strontium in United States, India, China, Germany and 12 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Strontium in India?

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

What is the price of Strontium?

Suppliers quote Strontium 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 Strontium

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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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