What is this ingredient?

미국 FDA 물질 등록 · UNII 3A3U0GI71G · 등록명 Magnesium oxide · 단일 화학물질

All ingredients

Ingredient Dictionary

MAGNESIUM OXIDE

How much products actually contain

No product states its amount yet.

Of the products containing it, 17 list it before the 1% line and 6 after it (usually 1% or less).

Products using this ingredient

12 of 22 confirmed · likeliest to carry enough first · See all 22

Definition

US FDA substance register · UNII 3A3U0GI71G · registered name Magnesium oxide · single chemical substance

Source: US FDA Unique Ingredient Identifier (UNII)

Cosmetic roles

Keeps pH steadyBUFFERINGMakes a clear formula opaqueOPACIFYINGAbsorbs water or oilABSORBENT

Safety & regulatory references

Allowed colourant: United States

Source: 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 酸化Ｍｇ: 本品は、マグネシウムの酸化物であり、次の化学式で表される。

Source: JCIA labelling names (Japan)

Names & identifiers

MAGNESIUM OXIDEINCI마그네슘옥사이드Korean label name (MFDS standard)Magnesium oxide (MgO)Synonym酸化ＭｇJapanese labelling name

CAS No.chemical registry number: 1309-48-4
EC No.EU chemical inventory number: 215-171-9
DTXSIDUS EPA chemical ID: DTXSID9049665
DTXCIDUS EPA compound ID: DTXCID801323192

IUPAC: Magnesium oxide (1/1)
Molecular formula: Mg2O2
Molecular weight: 80.608 g/mol

Measured properties

Appearance: Magnesium oxide appears as a white solid, often found as a powder. When fine particles of magnesium oxide are dispersed in air, whether directly or when generated by the burning or cutting of magnesium metal, the resulting magnesium oxide fume is an inhalation hazard. · Other Solid, Wet Solid, Dry Powder, Large Crystals, CBI, Liquid
Odour: Odorless · odourless
Boiling point: 6512 °F at 760 mmHg (NIOSH, 2024) · 3,600 °C
Melting point: 5072 °F (NIOSH, 2024) · 2825 °C
Solubility: 0.009 % at 86 °F (NIOSH, 2024) · Practically insoluble in water. Insoluble in ethanol
Density: 3.58 (NIOSH, 2024) - Denser than water, will sink · 3.6 g/cu cm
pH: pH = 10.3 (saturated aqueous solution) · 10.3
Colour: white
Melting/freezing point: 2825 ℃
Initial boiling point and range: 3600 ℃
Vapour pressure: 0 ㎜Hg
Vapour density: 3.6 g/㎤
Relative density: 3.6 (g/cu cm)
Molecular weight: 40.3

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 162 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.

Binder33
pH regulating agent16
Catalyst11
Filler11
Processing aids not otherwise specified10
Surface modifier9
Chemical reaction regulator6
Flux agent5

29 other uses

Flame retardant5
Flavouring and nutrient5
Soil amendments4
Intermediate4
Absorbent4
Hardener3
Thickening agent3
Pigment3
Opacifer3
Corrosion inhibitor3
Lubricating agent2
Viscosity modifier2
Stabilizing agent2
Photosensitive agent2
Oxidizing agent2
Adsorbent1
Fuel agents1
Heat stabilizer1
Anti-caking agent1
Reducing agent1
Plating agent1
Etching agent1
Fuel1
No specific technical function1
Degradant/impurity (EPA)1
Drier1
Humectant1
Elasticizer1
Coalescing agent1

Source: US EPA CompTox dashboard