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Hydrogen

Hydrogen
Hydrogen
CAS No.
1333-74-0
Chemical Name:
Hydrogen
Synonyms
H2;PROTIUM;HYDROGE;HYDROGEN;diprotium;Dihydrogen;p-Hydrogen;o-Hydrogen;hydrogengas;Wasserstoff
CBNumber:
CB7686195
Molecular Formula:
H2
Formula Weight:
2.02
MOL File:
1333-74-0.mol

Hydrogen Properties

Melting point:
−259.2 °C(lit.)
Boiling point:
−252.8 °C(lit.)
Density 
0.0899
vapor density 
0.07 (21 °C, vs air)
Flash point:
<-150°C
pka
35(at 25℃)
explosive limit
74.2%
Water Solubility 
0.00017 g/100 mL
Merck 
13,4813
Stability:
Stable. Highly flammable. Readily forms explosive mixtures with air. Upper (U.K.) composition limit for use of a nitrogen/hydrogen mixture in the open lab is 5.7% hydrogen.
CAS DataBase Reference
1333-74-0(CAS DataBase Reference)
NIST Chemistry Reference
Hydrogen(1333-74-0)
EPA Substance Registry System
Hydrogen(1333-74-0)
SAFETY
  • Risk and Safety Statements
  • Hazard and Precautionary Statements (GHS)
Hazard Codes  F+
Risk Statements  12
Safety Statements  9-16-33
RIDADR  UN 1950 2.1
WGK Germany  -
RTECS  MW8900000
4.5-31
HazardClass  2.1
Hazardous Substances Data 1333-74-0(Hazardous Substances Data)
Symbol(GHS):
Signal word: Danger
Hazard statements:
Code Hazard statements Hazard class Category Signal word Pictogram P-Codes
H220 Extremely flammable gas Flammable gases Category 1 Danger P210, P377, P381, P403
H280 Contains gas under pressure; may explode if heated Gases under pressure Compressed gas
Liquefied gas
Dissolved gas
Warning P410+P403
Precautionary statements:
P210 Keep away from heat/sparks/open flames/hot surfaces. — No smoking.
P377 Leaking gas fire: Do not extinguish, unless leak can be stopped safely.
P381 Eliminate all ignition sources if safe to do so.
P410+P403 Protect from sunlight. Store in a well-ventilated place.

Hydrogen price More Price(1)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 295396 Hydrogen ≥99.99% 1333-74-0 56l $243.5 2017-11-08 Buy

Hydrogen Chemical Properties,Uses,Production

Chemical Properties

colourless gas

Definition

ChEBI: An elemental molecule consisting of two hydrogens joined by a single bond.

Uses

In oxy-hydrogen blowpipe (welding) and limelight; autogenous welding of steel and other metals; manufacture of ammonia, synthetic methanol, HCl, NH3; hydrogenation of oils, fats, naphthalene, phenol; in balloons and airships; in metallurgy to reduce oxides to metals; in petroleum refining; in thermonuclear reactions (ionizes to form protons, deuterons (D) or tritons (T)). liquid hydrogen used in bubble chambers to study subatomic particles; as a coolant.

General Description

Hydrogen is a colorless, odorless gas. Hydrogen is easily ignited. Once ignited Hydrogen burns with a pale blue, almost invisible flame. The vapors are lighter than air. Hydrogen is flammable over a wide range of vapor/air concentrations. Hydrogen is not toxic but is a simple asphyxiate by the displacement of oxygen in the air. Under prolonged exposure to fire or intense heat the containers may rupture violently and rocket. Hydrogen is used to make other chemicals and in oxyHydrogen welding and cutting.

Air & Water Reactions

Highly flammable.

Reactivity Profile

Finely divided platinum and some other metals will cause a mixture of Hydrogen and oxygen to explode at ordinary temperatures. If a jet of Hydrogen in air impinges on platinum black the metal surface gets hot enough to ignite the gases, [Mellor 1:325(1946-1947)]. Explosive reactions occur upon ignition of mixtures of nitrogen trifluoride with good reducing agents such as ammonia, Hydrogen, Hydrogen sulfide or methane. Mixtures of Hydrogen, carbon monoxide, or methane and oxygen difluoride are exploded when a spark is discharged, [Mellor 2, Supp. 1:192(1956)]. An explosion occurred upon heating 1'-pentol and 1''-pentol under Hydrogen pressure. Hydrogen appears that this acetylenic compound under certain conditions suddenly breaks down to form elemental carbon, Hydrogen, and carbon monoxide with the release of sufficient energy to develop pressures in excess of 1000 atmospheres, [AIChE Loss Prevention, p1, (1967)].

Health Hazard

Vapors may cause dizziness or asphyxiation without warning. Some may be irritating if inhaled at high concentrations. Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite. Fire may produce irritating and/or toxic gases.

Fire Hazard

EXTREMELY FLAMMABLE. Will be easily ignited by heat, sparks or flames. Will form explosive mixtures with air. Vapors from liquefied gas are initially heavier than air and spread along ground. CAUTION: Hydrogen (UN1049), Deuterium (UN1957), Hydrogen, refrigerated liquid (UN1966) and Methane (UN1971) are lighter than air and will rise. Hydrogen and Deuterium fires are difficult to detect since they burn with an invisible flame. Use an alternate method of detection (thermal camera, broom handle, etc.) Vapors may travel to source of ignition and flash back. Cylinders exposed to fire may vent and release flammable gas through pressure relief devices. Containers may explode when heated. Ruptured cylinders may rocket.

Hydrogen Preparation Products And Raw materials

Raw materials

Preparation Products


Hydrogen Suppliers

Global( 61)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Henan Tianfu Chemical Co.,Ltd.
0371-55170693
0371-55170693 info@tianfuchem.com CHINA 9974 55
Shanghai Hanhong Scientific Co.,Ltd. 021-54306202,021-54302127,021-54308259,13764082696
+86-21-54291107 jerry.ma@hanhonggroup.com China 28711 64
(CSR Factory)China Skyrun Industrial CO.,ltd Please Email
manager@chinaskyrun.com sales@chinaskyrun.com China 12202 58
Chizhou Kailong Import and Export Trade Co., Ltd. Please Email
- xg01_gj@163.com China 9690 50
Sigma-Aldrich 021-61415566 800-819-3336(Tel) 400-620-3333(Mobile)
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Shanghai wechem chemical co., ltd 021-5198 7501
021-6192 7501 info@wechem.cn China 236 58

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