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295396

Sigma-Aldrich

Hydrogen

≥99.99%

Synonym(s):

Hydrogen gas

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About This Item

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
Pricing and availability is not currently available.

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

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General description

Hydrogen(H2) is colorless, odorless, tasteless, non-toxic, and highly flammable diatomic gas.[1][2]

Application

H2 can be used:
  • To reduce metal oxide to metal.[1][3]
  • In the catalytic hydrogenation of nitro compounds, ketones, and olefinic compounds.[2][4][5][6]

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

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Pictograms

FlameGas cylinder
GHS02,GHS04

Signal Word

Danger

Hazard Statements

H220,H280

Precautionary Statements

P210 - P377 - P381 - P410 + P403

Hazard Classifications

Flam. Gas 1A - Press. Gas Compr. Gas

Storage Class Code

2A - Gases

WGK

nwg

Flash Point(F)

<-238.0 °F - closed cup

Flash Point(C)

< -150 °C - closed cup

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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Certificates of Analysis (COA)

Lot/Batch Number
MKCV9214
MKCV4921
MKCT2356
MKCT9540
MKCQ0950

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Metal-free catalytic olefin hydrogenation: low-temperature H2 activation by frustrated Lewis pairs
Greb L, et al.
Angewandte Chemie (International ed. in English), 51(40), 10164-10168 (2012)
Gold catalysts open a new general chemoselective route to synthesize oximes by hydrogenation of α, β,-unsaturated nitrocompounds with H2
Corma A, et al.
Journal of the American Chemical Society, 129(20), 6358-6359 (2007)
Catalytic reductive transformations of carboxylic and carbonic acid derivatives using molecular hydrogen
Dub, Pavel A and Ikariya, Takao
ACS Catalysis, 2(8), 1718-1741 (2012)
Effects of reduction temperature and metal- support interactions on the catalytic activity of Pt/γ-Al2O3 and Pt/TiO2 for the oxidation of CO in the presence and absence of H2
Alexeev OS, et al.
The Journal of Physical Chemistry B, 109(49), 23430-23443 (2005)
Kinetics of reduction of iron oxides by H2: Part I: Low temperature reduction of hematite
Pineau A, et al.
Thermochimica Acta, 447(1), 89-100 (2006)
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Questions

1–2 of 2 Questions  

  1. How can I determine the shelf life / expiration / retest date of this product?

    1 answer

    1. If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
      For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
      For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
      For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/449/386/product-dating-information-mk.pdf

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  2. How is shipping temperature determined? And how is it related to the product storage temperature?

    1 answer

    1. Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf

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