Ingredient Dictionary

FERROUS SULFATE

Iron(2+) sulfate (anhydrous) is a compound of iron and sulfate in which the ratio of iron(2+) to sulfate ions is 1:1.

Korean limit: 6%

FERROUS SULFATE Molecular structure — Molecular structure

Definition

Iron(2+) sulfate (anhydrous) is a compound of iron and sulfate in which the ratio of iron(2+) to sulfate ions is 1:1. Various hydrates occur naturally - most commonly the heptahydrate, which loses water to form the tetrahydrate at 57C and the monohydrate at 65C. It has a role as a reducing agent. It is an iron molecular entity and a metal sulfate. It contains an iron(2+).

Source: PubChem

US FDA substance register · UNII 2IDP3X9OUD · registered name FERROUS SULFATE ANHYDROUS · single chemical substance

Source: US FDA Unique Ingredient Identifier (UNII)

Cosmetic roles

Gives a tightening feelASTRINGENT

Safety & regulatory references

Restricted: South Korea
Allowed colourant: United States

Source: MFDS (Korea) cosmetic regulatory information · US FDA prohibited and restricted ingredients

Not classified under Korea’s toxic-substance GHS list · existing chemical substance

Source: Korea toxic substances GHS register (NIER)

More data — names, identifiers, properties, test records, literature

Official labels & definitions

JCIA labelling name 硫酸第一鉄: 本品は、硫酸（＊）の第一鉄塩であり、次の化学式で表される。FeSO4

Source: JCIA labelling names (Japan)

Names & identifiers

FERROUS SULFATEINCI페러스설페이트Korean label name (MFDS standard)Sulfuric acid, iron(2+) salt (1:1)Synonym硫酸第一鉄Japanese labelling name

CAS No.chemical registry number: 7720-78-7
EC No.EU chemical inventory number: 231-753-5
DTXSIDUS EPA chemical ID: DTXSID0029688
DTXCIDUS EPA compound ID: DTXCID709688

IUPAC: Iron(2+) sulfate
Molecular formula: FeO4S
Molecular weight: 151.9 g/mol

Measured properties

Appearance: Ferrous sulfate appears as a greenish or yellow-brown crystalline solid. Density 15.0 lb /gal. Melts at 64 °C and loses the seven waters of hydration at 90 °C. The primary hazard is the threat to the environment. Immediate steps should be taken to limit its spread to the environment. Used for water or sewage treatment, as a fertilizer ingredient. · Large Crystals, CBI, Dry Powder, Other Solid, Liquid
Boiling point: > 300 °C
Melting point: 64
Solubility: 25.6 g/100 mL · White to yellow crystalline powder. Sol in water. Loses water @ about 300 °C, decomp @ higher temp. /Ferrous sulfate monohydrate/
Density: 1.9 at 59 °F (USCG, 1999) - Denser than water, will sink · 3.56 g/cu cm
Stability: In moist air, ferrous sulfate rapidly oxidizes and becomes coated with brownish-yellow ferric sulfate... . The rate of oxidation is increased by the addition of alkali or by exposure to light.
Dissociation constant: -3
Colour: white
Odour: odourless
pH: 3~4
Initial boiling point and range: 316 ℃
Vapour pressure: 28.9 hPa (30.7℃)
Water solubility: 228 g/ℓ (25℃)
Vapour density: 3.65 g/㎤
Relative density: 1 213 kg/m³ (18℃)
n-Octanol/water partition coefficient (Kow): 0.37
Decomposition temperature: 315 ℃
Molecular weight: 151.909

Values measured on the substance itself. The KOSHA data are a reference for writing and reviewing safety data sheets, not a specification for a commercial raw material.

Source: PubChem · KOSHA safety data sheets (Korea)

What products actually use it for

What the 16 products reported to the US EPA with this ingredient use it for. Products outside cosmetics are included, so the top few rows are its main uses.

Soil amendments4
Catalyst2
Chemical reaction regulator2
Intermediate2
Solids separation (precipitating) agent, not other2
Deodorizer1
Astringent (EPA)1
Processing aids not otherwise specified1

1 other uses

Cloud-point depressant1

Source: US EPA CompTox dashboard

Irritation and sensitisation studies

5 skin studies and 3 eye studies are on record.

Classed as moderate1

The study conclusions largely agree (100%). These tests are on the raw material itself; irritation at the amount in a finished product is a different question.

See all 8 studies

Skin Irrit. 2
Skin Irritation · Authoritative
Category 6.3A (Category 2)
Skin Irritation · Read Across
Severe Irritation
skin irritation: in vivo · Screening · OECD Guideline 404 (Acute Dermal Irritation / Corrosion) according to
Studies Indicate No Significant Irritation
skin irritation: in vivo · Screening · OECD Guideline 404 (Acute Dermal Irritation / Corrosion) according to
Not likely to be sensitizing
skin sensitisation: in vivo (LLNA) · Screening · according to OECD Guideline 429 (Skin Sensitisation: Local Lymph Node Assay) according to EU Method B.42 (Skin Sensitisation: Local Lymph Node Assay) according to EPA OPPTS 870.2600 (Skin Sensitisation)
Category 6.4A (Category 2A)
Eye Irritation · Read Across
Eye Irrit. 2
Eye Irritation · Authoritative
Studies Indicate No Significant Irritation
eye irritation: in vivo · Screening · OECD Guideline 405 (Acute Eye Irritation / Corrosion) according to