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Hydroxides and bases

Ferrous hydroxide

Also known as Iron dihydroxide, Iron(II) hydroxide, Iron hydroxide (Fe(OH)2)

CAS 18624-44-7Formula H2FeO2Molar mass 89.86 g/molEC 242-456-5
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Ferrous hydroxide chemical structure, H2FeO2, CAS 18624-44-7
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
18624-44-7
Formula
H2FeO2
Physical form
Solid
Density
3.4 @25 °C
HS code
282110
Category
Hydroxides and bases
Illustrative photo, closed blue fibre drums on a pallet in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is Ferrous hydroxide?

Plain description, key identifiers and synonyms

Ferrous hydroxide is a chemical substance with the molecular formula H2FeO2 and a molar mass of 89.86 g/mol. Its CAS registry number is 18624-44-7. The IUPAC name is iron(2+) dihydroxide.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
iron(2+) dihydroxide
CAS number
18624-44-7 CAS number cross-checked
EC number
242-456-5
Molecular formula
H2FeO2
UNII
7JIM5W32UU
InChIKey
NCNCGGDMXMBVIA-UHFFFAOYSA-L
InChI
InChI=1S/Fe.2H2O/h;2*1H2/q+2;;/p-2
SMILES (canonical and isomeric)
[OH-].[OH-].[Fe+2]

Synonyms

  • Iron dihydroxide
  • Iron(II) hydroxide
  • Iron hydroxide (Fe(OH)2)

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.
Density
3.4 @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
89.86 g/molcalc.
Exact mass
89.9404 Dacalc.
LogP (octanol/water)
-0.36calc.
Topological polar surface area
60 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
2calc.
Rotatable bonds
0calc.
Heavy atoms
3calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.
Components
3calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

No GHS hazard classification is recorded for this substance yet. That does not mean it is harmless.

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

Ferrous hydroxide suppliers

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All 2 suppliers

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

2 suppliers in 2 countries

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Ferrous hydroxide 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

Industrial uses: Alloys.

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 Ferrous hydroxide is traded under.

HS 2821.10Indicative HS code

Iron oxides and hydroxides

World exports in 2024
$669M
+0.0% vs 2023, imports $910M
2019 to 2024
Top exporters
  1. China48.4%
  2. United States7.3%
  3. Italy5.5%
Top importers
  1. United States27.1%
  2. China8.9%
  3. United Kingdom3.8%
Reported customs values in USD, not prices.Full trade data

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

Frequently asked questions

Quick answers about Ferrous hydroxide, based on the data on this page

What is Ferrous hydroxide?

Ferrous hydroxide is a chemical substance with the molecular formula H2FeO2 and a molar mass of 89.86 g/mol. Its CAS registry number is 18624-44-7. The IUPAC name is iron(2+) dihydroxide.

What is the CAS number of Ferrous hydroxide?

The CAS registry number of Ferrous hydroxide is 18624-44-7.

What is the molecular formula and weight of Ferrous hydroxide?

The molecular formula of Ferrous hydroxide is H2FeO2 and its molar mass is 89.86 g/mol.

What is Ferrous hydroxide used for?

Industrial uses: Alloys.

Is Ferrous hydroxide hazardous?

No GHS hazard classification for Ferrous hydroxide is recorded on CompoundList yet. That does not prove it is safe. Always read the supplier safety data sheet.

What is the HS code of Ferrous hydroxide?

Ferrous hydroxide is usually classified under HS code 282110 (Iron oxides and hydroxides). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Ferrous hydroxide?

CompoundList lists 2 suppliers of Ferrous hydroxide in India and United States. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Ferrous hydroxide in India?

1 supplier in India list Ferrous hydroxide on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Ferrous hydroxide?

Suppliers quote Ferrous hydroxide 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 Ferrous hydroxide

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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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