295396

Hydrogen

≥99.99%

• Synonym(s): Hydrogen gas
• Empirical Formula (Hill Notation): H₂
• CAS Number: 1333-74-0
• Molecular Weight: 2.02
• EC Number: 215-605-7
• MDL number: MFCD00070838
• UNSPSC Code: 12142100
• PubChem Substance ID: 24857780
• NACRES: NA.22

Properties

• vapor density: 0.07 (21 °C, vs air)
• Quality Level: 200
• assay: ≥99.99%
• autoignition temp.: 1060 °F
• expl. lim.: 74.2 %
• impurities: ≤10 ppm oxygen; ≤5 ppm water
• bp: −252.8 °C (lit.)
• mp: −259.2 °C (lit.)
• SMILES string: [H]
• InChI: 1S/H2/h1H
• InChI key: UFHFLCQGNIYNRP-UHFFFAOYSA-N

Description

General description

Hydrogen(H₂) is colorless, odorless, tasteless, non-toxic, and highly flammable diatomic gas.

Application

H₂ can be used:

• To reduce metal oxide to metal.
• In the catalytic hydrogenation of nitro compounds, ketones, and olefinic compounds.

Packaging

Supplied in a carbon steel lecture bottle with a CGA180M/CGA110F needle valve installed.

Compatible with the following:

• Aldrich^® lecture-bottle station systems
• Aldrich^® lecture-bottle gas regulators

Other Notes

See Technical Information Bulletin AL-151 Gas Regulators: Selection, Installation, and Operation

Legal Information

Aldrich is a registered trademark of Sigma-Aldrich Co. LLC

Safety Information

• pictograms: GHS02,GHS04
• signalword: Danger
• hcodes: H220,H280
• pcodes: P210 - P377 - P381 - P410 + P403
• Hazard Classifications: Flam. Gas 1A - Press. Gas Compr. Gas
• Storage Class: 2A - Gases
• wgk_germany: nwg
• flash_point_f: <-238.0 °F - closed cup
• flash_point_c: < -150 °C - closed cup
• ppe: Eyeshields, Faceshields, Gloves, multi-purpose combination respirator cartridge (US)