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Metals, alloys and elements

Rubidium

Also known as Rubidium metallicum, Rb, rubidio

CAS 7440-17-7Formula RbMolar mass 85.47 g/molEC 231-126-6
GHS signal word: Danger. Pictograms: Flammable, Corrosive 40 suppliers listed Drug substance
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Element with atomic number and standard atomic weight

Key facts

What buyers check first

All properties
Melting point
39.5 °C
Boiling point
688 °C
Density
1.532 @ 20 °C
HS code
280519
Category
Metals, alloys and elements
UN number
UN 1423

What is Rubidium?

Plain description, key identifiers and synonyms

Rubidium atom is an alkali metal atom.

Rubidium is a chemical element with symbol Rb and atomic number 37.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
rubidium
CAS number
7440-17-7 CAS number cross-checkedOther or deprecated CAS: 15438-27-4, 22438-27-3
EC number
231-126-6
Molecular formula
Rb
UNII
MLT4718TJW
MDL number
MFCD00134055
InChIKey
IGLNJRXAVVLDKE-UHFFFAOYSA-N
InChI
InChI=1S/Rb
SMILES (canonical and isomeric)
[Rb]

Synonyms

  • Rubidium metallicum
  • Rb
  • rubidio
  • rubidium atom
  • Rubidium-103
  • Rubidium87
  • Rubidium metal
  • rubidium|rubidium atom|rubidio
  • Rubidium-106
  • Rubidium Standard: Rb @ 1000 microg/mL in 5% HNO3
  • Rubidium Standard: Rb @ 10000 microg/mL in 5% HNO3
  • 103Rb
  • Atomic Rubidium
  • Rubidium element
  • Element Rubidium
  • Element-Rb
  • Element:Rb
  • Element:Rubidium
  • Rubidium standard
  • Rubidium, isotope of mass 103
  • Rubidium, isotope of mass 106
  • Rb (element)
  • Rubidium (atomic)
  • Rubidium (element)
  • Rb Standard Solution
Show all 35 synonyms
  • Rubidium, elemental
  • 37Rb
  • Rb (Be F3)
  • Rubidium [UN1423] [Dangerous when wet]
  • Rubidium, ingot, 99.6% trace metals basis
  • Rubidium, 99.99% (metals basis), ampouled
  • Rubidium, 99.997% (metals basis), ampouled
  • Rubidium, 99.999% (metals basis), ampouled
  • Rubidium - Rb @ 1000 microg/mL in 5% HNO3
  • Rubidium, 99.99% (metals basis), breakseal, ampouled

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

Melting point
39.5 °Cexp.
Boiling point
688 °Cexp.
Density
1.532 @ 20 °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
85.47 g/molcalc.
Exact mass
84.9118 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

Hazard statements

  • H260In contact with water releases flammable gases which may ignite spontaneously.
  • H314Causes severe skin burns and eye damage.
Precautionary statements (17)
  • 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.
  • 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 + 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.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • 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.
UN number
UN 1423
Transport hazard class
4.3
Packing group
I

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

Rubidium suppliers

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

All 40 suppliers
30 of 30 offers

Suppliers marked Unclaimed profile have not claimed their profile yet. They are not verified by CompoundList, their offers are price on request and details may have changed, so please confirm them with the supplier. Company representatives can claim a profile with a business email on the company's own website domain. Our team verifies each claim and sends the result by email.

Where suppliers are based

40 suppliers in 13 countries

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Rubidium 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

Pharmacology

Rubidium is an element with atomic symbol Rb, atomic number 37, and atomic weight 85.468.

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 Rubidium 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 Rubidium is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

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

What is Rubidium?

Rubidium atom is an alkali metal atom.

What is the CAS number of Rubidium?

The CAS registry number of Rubidium is 7440-17-7. Other or deprecated CAS numbers: 15438-27-4, 22438-27-3.

What is the molecular formula and weight of Rubidium?

The molecular formula of Rubidium is Rb and its molar mass is 85.47 g/mol.

Is Rubidium hazardous?

Rubidium 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. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Rubidium?

Rubidium 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 Rubidium?

CompoundList lists 40 suppliers of Rubidium in United States, China, Germany, Spain and 9 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Rubidium?

Suppliers quote Rubidium 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 Rubidium

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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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