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Rare earth compounds

Thulium

Also known as TM, thulium atom, Thulium-169

CAS 7440-30-4Formula TmMolar mass 168.93 g/molEC 231-140-2
GHS signal word: Danger. Pictograms: Flammable, Harmful or irritant 32 suppliers listed
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Element with atomic number and standard atomic weight

Key facts

What buyers check first

All properties
Physical form
Solid
Boiling point
1,950 °C
Density
9.32 @25 °C
HS code
280530
Category
Rare earth compounds
Illustrative photo, closed jumbo bulk bags in a warehouse in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is Thulium?

Plain description, key identifiers and synonyms

Thulium atom is a lanthanoid atom and a f-block element atom.

Thulium is a chemical element with symbol Tm and atomic number 69.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
thulium
CAS number
7440-30-4 CAS number cross-checkedOther or deprecated CAS: 13598-55-5
EC number
231-140-2
Molecular formula
Tm
UNII
8RKC5ATI4P
MDL number
MFCD00011281
InChIKey
FRNOGLGSGLTDKL-UHFFFAOYSA-N
InChI
InChI=1S/Tm
SMILES (canonical and isomeric)
[Tm]

Synonyms

  • TM
  • thulium atom
  • Thulium-169
  • tulio
  • Thulium Standard: Tm @ 1000 microg/mL in 5% HNO3
  • Thulium Standard: Tm @ 10000 microg/mL in 5% HNO3
  • thulium metal
  • Thulium element
  • Thulium pieces
  • Thulium powder
  • Atomic Thulium
  • Element Thulium
  • Element:Thulium
  • Thulium foil
  • Element-Tm
  • Element:Tm
  • Thulium (atomic)
  • Thulium (element)
  • Tm (element)
  • 169Tm isotope
  • Isotope:169Tm
  • Tm Standard Solution
  • 169Tm (isotope)
  • Thulium-169 isotope
  • Isotope:Thulium-169
Show all 36 synonyms
  • Thulium, elemental
  • 69Tm
  • Thulium, ingot, 99.9%
  • Ultra Thin Thulium Nanofoil
  • Thulium 99.9%
  • Thulium Nanoparticle Dispersion
  • Thulium pieces, sublimed dendritic
  • Thulium foil, 0.1mm (0.004in) thick
  • Thulium foil, 0.25mm (0.01in) thick
  • Thulium, chips, 99.9% trace metals basis
  • Thulium, wire, 0.1m, diameter 0.6mm, 99%

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

Physical form
Solidexp.
Boiling point
1,950 °Cexp.
Density
9.32 @25 °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
168.93 g/molcalc.
Exact mass
168.9342 Dacalc.
LogP (octanol/water)
0calc.
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
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H228Flammable solid.
  • H319Causes serious eye irritation.
  • H335May cause respiratory irritation.
Precautionary statements (15)
  • P210Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
  • P240Ground and bond container and receiving equipment.
  • P241Use explosion-proof electrical, ventilating and lighting equipment.
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P271Use only outdoors or in a well-ventilated area.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P319Get medical help if you feel unwell.
  • P337 + P317If eye irritation persists: Get medical help.
  • P370 + P378In case of fire: Use appropriate media to extinguish.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • 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

Thulium suppliers

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

All 32 suppliers
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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

32 suppliers in 10 countries

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Thulium price

Indicative price range per kg from live supplier offers

No published prices right now

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Uses and applications

What the substance is used for, by industry and function

Applications are not documented for this substance yet. Suppliers often describe uses on their product pages, linked in the suppliers list above.

Regulatory status

Inventories, regulations and trade controls that list this substance

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 Thulium is traded under.

HS 2805.30Indicative HS code

Rare-earth metals, scandium and yttrium, whether or not intermixed or interalloyed

World exports in 2024
$385M
+7.4% vs 2023, imports $503M
2019 to 2024
Top exporters
  1. Vietnam * partner reported50.6%
  2. China24.9%
  3. Thailand17.1%
Top importers
  1. Japan49.0%
  2. Malaysia25.5%
  3. Vietnam * partner reported8.2%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

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

What is Thulium?

Thulium atom is a lanthanoid atom and a f-block element atom.

What is the CAS number of Thulium?

The CAS registry number of Thulium is 7440-30-4. Other or deprecated CAS numbers: 13598-55-5.

What is the molecular formula and weight of Thulium?

The molecular formula of Thulium is Tm and its molar mass is 168.93 g/mol.

Is Thulium hazardous?

Thulium carries the GHS signal word "Danger". Main hazards: flammable solid, causes serious eye irritation, may cause respiratory irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Thulium?

Thulium is usually classified under HS code 280530 (Rare-earth metals, scandium and yttrium, whether or not intermixed or interalloyed). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Thulium?

CompoundList lists 32 suppliers of Thulium in United States, China, Germany, Japan and 6 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 Thulium?

Suppliers quote Thulium 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 Thulium

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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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