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Rare earth compounds

Erbium oxide

Also known as Erbium trioxide, Erbium(3+) oxide, erbium-170-oxide

CAS 12645-29-3Formula Er2O3Molar mass 382.52 g/molEC 235-045-7
GHS signal word: Warning. Pictograms: Harmful or irritant, Hazardous to the environment 31 suppliers listed
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Erbium oxide chemical structure, Er2O3, CAS 12645-29-3
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
12645-29-3
Formula
Er2O3
Molar mass
382.52 g/mol
Physical form
Powder
HS code
284690
Category
Rare earth compounds
Illustrative photo, a shrink wrapped pallet of kraft paper sacks in a chemical plant
Typical packagingIllustrative packaging image, not the actual product

What is Erbium oxide?

Plain description, key identifiers and synonyms

Erbium oxide is a chemical substance with the molecular formula Er2O3 and a molar mass of 382.52 g/mol. Its CAS registry number is 12645-29-3. The IUPAC name is bis(erbium(3+)), tris(oxygen(2-)).

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
bis(erbium(3+)), tris(oxygen(2-))
CAS number
12645-29-3 CAS number cross-checked
EC number
235-045-7
Molecular formula
Er2O3
InChIKey
ZXGIFJXRQHZCGJ-UHFFFAOYSA-N
InChI
InChI=1S/2Er.3O/q2*+3;3*-2
SMILES (canonical and isomeric)
[O-2].[O-2].[O-2].[Er+3].[Er+3]

Synonyms

  • Erbium trioxide
  • Erbium(3+) oxide
  • erbium-170-oxide
  • Erbium oxide (Er2O3)
  • Erbia
  • Dierbium trioxide
  • Erbium sesquioxide
  • erbium(3+), oxygen(2-)
  • (170)Er-oxide
  • Erbium oxide (ErO1.5)
  • Erbium oxide (2/3)

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
Powderexp.

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
382.52 g/molcalc.
Exact mass
379.8453 Dacalc.
LogP (octanol/water)
-0.36calc.
Topological polar surface area
85.5 ร…ยฒcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
0calc.
Heavy atoms
5calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.
Components
5calc.

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
GHS09: Hazardous to the environment
Hazardous to the environment

Hazard statements

  • H319Causes serious eye irritation.
  • H400Very toxic to aquatic life.
  • H410Very toxic to aquatic life with long lasting effects.
Precautionary statements (7)
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P337 + P317If eye irritation persists: Get medical help.
  • P391Collect spillage.
  • 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

Erbium oxide suppliers

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

All 31 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

31 suppliers in 13 countries

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Erbium oxide price

Indicative price range per kg from live supplier offers

No published prices right now

Suppliers quote this chemical on request. Send one free request and compare quotes side by side.

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Uses and applications

What the substance is used for, by industry and function

Industrial uses: Catalyst.

Consumer uses: Catalyst.

Regulatory status

Inventories, regulations and trade controls that list this substance

No regulatory list memberships are recorded for this substance yet. Always check the rules of the importing and exporting country before trade.

HS code and trade data

Customs classification and reported world trade statistics

Global trade

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

HS 2846.90Indicative HS code

Compounds, inorganic or organic (excluding cerium), of rare-earth metals, of yttrium, scandium or of mixturesโ€ฆ

World exports in 2024
$2.49B
โˆ’24.4% vs 2023, imports $2.28B
2019 to 2024
Top exporters
  1. Myanmar * partner reported32.8%
  2. China15.1%
  3. Malaysia14.7%
Top importers
  1. China60.3%
  2. Vietnam * partner reported7.7%
  3. United States6.6%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

Quick answers about Erbium oxide, based on the data on this page

What is Erbium oxide?

Erbium oxide is a chemical substance with the molecular formula Er2O3 and a molar mass of 382.52 g/mol. Its CAS registry number is 12645-29-3. The IUPAC name is bis(erbium(3+)), tris(oxygen(2-)).

What is the CAS number of Erbium oxide?

The CAS registry number of Erbium oxide is 12645-29-3.

What is the molecular formula and weight of Erbium oxide?

The molecular formula of Erbium oxide is Er2O3 and its molar mass is 382.52 g/mol.

What is Erbium oxide used for?

Industrial uses: Catalyst. Consumer uses: Catalyst.

Is Erbium oxide hazardous?

Erbium oxide carries the GHS signal word "Warning". Main hazards: causes serious eye irritation, very toxic to aquatic life, very toxic to aquatic life with long lasting effects. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Erbium oxide?

Erbium oxide is usually classified under HS code 284690 (Compounds, inorganic or organic, of rare-earth metals, of yttrium or of scandium or ofโ€ฆ). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Erbium oxide?

CompoundList lists 31 suppliers of Erbium oxide in China, United States, India, Germany and 9 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Erbium oxide in India?

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

What is the price of Erbium oxide?

Suppliers quote Erbium oxide 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 Erbium oxide

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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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