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Ingredient Dictionary

SILICON

Silicon atom is a metalloid atom, a nonmetal atom and a carbon group element atom.

Molecular structure

How much products actually contain

No product states its amount yet.

Of the products containing it, 1 list it before the 1% line and 0 after it (usually 1% or less).

Products using this ingredient

1 of 1 confirmed · likeliest to carry enough first

Definition

Silicon atom is a metalloid atom, a nonmetal atom and a carbon group element atom.

Source: PubChem

US FDA substance register · UNII Z4152N8IUI · registered name SILICON · single chemical substance

Source: US FDA Unique Ingredient Identifier (UNII)

Silicon is a metalloid element.

Cosmetic roles

Scrubs physicallyABRASIVE

Safety & regulatory references

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 ケイ素: 本品は、半金属元素Ｓiである。

Source: JCIA labelling names (Japan)

Names & identifiers

SILICONINCIケイ素Japanese labelling name
CAS No.chemical registry number
7440-21-3
EC No.EU chemical inventory number
231-130-8
EC No.EU chemical inventory number
231-130-8 (I)
DTXSIDUS EPA chemical ID
DTXSID0051441
DTXCIDUS EPA compound ID
DTXCID5030038
IUPAC
Silicon
Molecular formula
Si
Molecular weight
28.085 g/mol

Measured properties

Appearance
Silicon powder, amorphous appears as a dark brown powder. Insoluble in water and denser than water. Burns readily when exposed to heat or flames, and may be difficult to extinguish. Water may not be effective in extinguishing flames. Used to make computer microchips. · Dry Powder, Other Solid, Large Crystals, Wet Solid, CBI
Boiling point
4271 °F at 760 mmHg (NIOSH, 2024) · 2355 °C
Melting point
2570 °F (NIOSH, 2024) · 1410 °C
Solubility
Insoluble (NIOSH, 2024) · Soluble in a mixture of nitric and hydrofluoric acids and in alkalis, insoluble in nitric and hydrochloric acid
Density
2.33 at 77 °F (NIOSH, 2024) - Denser than water, will sink · 2.33 g/cu cm at 25 °C/4 °C
Viscosity
Dynamic viscosity = 0.88 cP at MP and 0.7 cP at 1500 °C, kinematic viscosity (calculated) = 0.347 cSt at MP and 0.28 cSt at 1500 °C /Liquid silicon/
Colour
white
Odour
odourless
Melting/freezing point
1410 ℃
Initial boiling point and range
2355 ℃
Flash point
33~44 ℃
Flammability (solid, gas)
&amp, gt, = 300 - &amp, lt, = 600
Vapour pressure
1 ㎜Hg (at 1724 ℃)
Relative density
2.33 g/ml (at 25 °C(lit.) )
Auto-ignition temperature
(25 - 66 ℃, 100 - 105 kPa)
Molecular weight
28.09

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 95 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.

  • Degradant/impurity (EPA)26
  • Alloying element12
  • Filler7
  • Hardener6
  • Flow promoter5
  • Surface modifier5
  • Defoamer4
  • Intermediate4
15 other uses
  • Reducing agent3
  • Abrasive3
  • Wetting agent (non-aqueous)3
  • Semiconductor and photovoltaic agent2
  • Anti-adhesive/cohesive2
  • Pigment2
  • Dispersing agent2
  • Waterproofing agent2
  • No specific technical function1
  • Oxidizing agent1
  • pH regulating agent1
  • Anti-slip agent1
  • Solvent1
  • Processing aids not otherwise specified1
  • Sealant (barrier)1

Source: US EPA CompTox dashboard

Irritation and sensitisation studies

3 skin studies and 3 eye studies are on record.

Classed as low1

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 6 studies
  • Classification not possible
    Skin Irritation · Screening
  • Classification not possible
    Skin Sensitization · Screening
  • Studies Indicate No Significant Irritation
    skin irritation: in vivo · Screening · other guideline: Organisation for Economic Co-operation and Development (1979). OECD Short-term and Lone-term Toxicology' Groups. Final Report: Acute Dermal Irritation/ Corrosivity. 31 December. p. 35. according to
  • Category 2B
    Eye Irritation · Screening
  • Studies Indicate No Significant Irritation
    eye irritation: in vivo · Screening · other guideline: technique as described in the "Appraisal of the Safety of Chemicals in Foods, Drugs and Cosmetics" (1959) of the US Association of Food and Drug Officials (AFDO) equivalent or similar to
  • Severe Irritation
    eye irritation: in vivo · Screening · other guideline: Organisation for Economic Co-operation and Development (1979). OECD Short-term and Long-term Toxicology Groups, Final Report: Acute Eye Irritation/Corrosivity. 31 December, p. 40. according to other guideline: Association Francaise de Normalisation (1982). Evaluation de I'lrritation et/ou de la Corrosion Oculaires, chez le Lapin. AFNOR (Project): TD3-B dot. 37 according to other guideline: Jownal OJiciel de la R+ptrblique Franwise (1973). MCthodes officielles d'analyse des cosmttiques et produits de beaute. Annexe II: Mtthode ofiicielle pour la determination de I'irritation oculaire. Arrett du I6 Avril 1973. Journal O$icie/ 5 June, p. 3953. according to

Source: US EPA CompTox dashboard

Related literature

Linked databases 16

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