Dihydrogen is an elemental molecule consisting of two hydrogens joined by a single bond.
Definition
US FDA substance register · UNII 7YNJ3PO35Z · registered name Hydrogen · single chemical substance
Dihydrogen is an elemental molecule consisting of two hydrogens joined by a single bond. It has a role as an electron donor, an antioxidant, a fuel, a human metabolite and a member of food packaging gas. It is a gas molecular entity, an elemental molecule and an elemental hydrogen.
Source: PubChem
Cosmetic roles
Safety & regulatory references
Not classified under Korea’s toxic-substance GHS list · existing chemical substance
More data — names, identifiers, properties, test records, literature
Official labels & definitions
JCIA labelling name 水素: 本品は、次の化学式で表される二原子気体分子である。
Source: JCIA labelling names (Japan)
Names & identifiers
- CAS No.chemical registry number
- 1333-74-0
- EC No.EU chemical inventory number
- 215-605-7
- DTXSIDUS EPA chemical ID
- DTXSID9029643
- DTXCIDUS EPA compound ID
- DTXCID00196437
- Molecular formula
- H2
- Molecular weight
- 2.016 g/mol
Measured properties
- Appearance
- gas
- Colour
- colourless
- Odour
- odourless
- Melting/freezing point
- -259 ℃
- Initial boiling point and range
- -253 ℃
- Upper/lower flammability or explosive limits
- 75 / 4 %
- Vapour pressure
- 1240000 ㎜Hg(25℃)
- Water solubility
- 0.000162 g/100㎖(21℃)
- Vapour density
- 0.07
- n-Octanol/water partition coefficient (Kow)
- 0.45 (est.)
- Auto-ignition temperature
- (500-571℃)
- Viscosity
- 0.0256 cP(26.8℃)
- Molecular weight
- 2
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: KOSHA safety data sheets (Korea)
What products actually use it for
What the 15 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.
- Fuel3
- Processing aids not otherwise specified2
- Fuel agents2
- Intermediate2
- Deodorizer2
- Reducing agent1
- Adhesion/cohesion promoter1
- Antioxidant1
1 other uses
- Flame retardant1
Source: US EPA CompTox dashboard
Related literature
Linked databases 18
- Australian Industrial Chemicals Inventory (AICIS)
- ChEBI 2
- EU CosIng ingredient list 2
- JCIA labelling names (Japan)
- Korea Cosmetic Association ingredient dictionary
- Korea toxic substances GHS register (NIER)
- KOSHA safety data sheets (Korea)
- MFDS (Korea) cosmetic ingredient register 2
- NIST Chemistry WebBook
- PubChem
- Tlooto literature search 2 3 4 5
- UniChem cross-reference IDs
- US EPA CompTox dashboard 2
- US EPA DSSTox chemical database
- US FDA substance registration (GSRS)
- US FDA Unique Ingredient Identifier (UNII)
- Wikidata
- Wikipedia · English · Chinese