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490474

Sigma-Aldrich

Oxygen-18O2

97 atom % 18O

Synonym(s):

18O Labeled oxygen

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About This Item

Linear Formula:
18O2
CAS Number:
32767-18-3
Molecular Weight:
36.00
MDL number:
MFCD00084251
UNSPSC Code:
12142200
PubChem Substance ID:
24872565
NACRES:
NA.12

vapor density

1.11 (vs air)

Quality Level

200

isotopic purity

97 atom % 18O

Assay

99% (CP)

form

gas (Compressed)

bp

−183 °C (lit.)

mp

−218 °C (lit.)

mass shift

M+4

storage temp.

room temp

SMILES string

[18O]=[18O]

InChI

1S/O2/c1-2/i1+2,2+2

InChI key

MYMOFIZGZYHOMD-XPULMUKRSA-N

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Packaging

All gas volumes are quoted at Standard Temperature and Pressure (STP) and not at Normal Temperature and Pressure (NTP). One STP Liter is 7.7% more gas than one NTP Liter.
Standard 500 mL quantitiy is packaged in a 25 mL Sure/Pac cylinder with brass 1/4" male NPT valve. Nominal gas pressure at 21ºC is 220 psig for 500 mL.

Standard 1 L quantity is packaged in a 450 mL carbon steel lecture bottle with brass CGA 110/180. Nominal gas pressure at 21ºC is 20 psig for 1 L.

Because of the relatively low cylinder pressures, care must be taken when extracting this product from the cylinder.
This product may be available from bulk stock and can be packaged on demand. For information on pricing, availability and packaging, please contact Stable Isotopes Customer Service.

Recommended products

Brass hose adapter Z146811 or brass body mini gas regulator Z513539 is recommended for 500 mL Sure/Pac cylinder (U.S only). For 1 L cylinder, either stainless steel control valve Z146951 or Z187224 is recommended.
PTFE sealing washers GCA inlet size 180 Z146994
PTFE sealing washers CGA inlet size 110 Z146986

hose barb

Product No.
Description
Pricing

Z146811

Hose adapter, brass

regulator

Product No.
Description
Pricing

Pictograms

Flame over circleGas cylinder
GHS03,GHS04

Signal Word

Danger

Hazard Statements

H270,H280

Hazard Classifications

Ox. Gas 1 - Press. Gas Compr. Gas

Storage Class Code

2A - Gases

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Regulatory Listings

Regulatory Listings are mainly provided for chemical products. Only limited information can be provided here for non-chemical products. No entry means none of the components are listed. It is the user’s obligation to ensure the safe and legal use of the product.

ISHL Indicated Name

Substances Subject to be Indicated Names

ISHL Notified Names

Substances Subject to be Notified Names

JAN Code

490474-1L-EU:
490474-BULK:
490474-500ML:
490474-1L:
490474-250ML:
490474-VAR:

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Certificates of Analysis (COA)

Lot/Batch Number
MBBC5696
MBBC5511
MBBC3474
MBBC0260V
MBBB6186V

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Sui So et al.
Physical chemistry chemical physics : PCCP, 16(45), 24954-24964 (2014-10-18)
β-Hydroxyperoxyl radicals are formed during atmospheric oxidation of unsaturated volatile organic compounds such as isoprene. They are intermediates in the combustion of alcohols. In these environments the unimolecular isomerization and decomposition of β-hydroxyperoxyl radicals may be of importance, either through

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