Application | Material safety data sheet


SECTION 8 PHYSICAL AND CHEMICAL PROPERTIES
1
 Name HELIUM
2
 Formula He
3
 CAS Number 7440-59-7
4
 Molecular Weight 4.003
5
 Melting point 1.76 K , -271.39 C , -456.5 F
6
 Boiling point @ 101.325 kPa (1 atm) 4.22 K , -268.93 C , -452.07 F
7
 Critical Temperature 5.2 K , 267.95 C , -450.31 F
8
 Critical Pressure 2.28 bar , 2.25 atm , 33.07 psia
9
 Critical Volume 57.3 cm3/mol
10
 Critical Density 0.0699 g/cm3
11
 Critical Compressibility Factor 0.302
12
 Acentric Factor -0.390
13
 Density of Liquid @ -270 C 0.139 g/cm3
14
 Coefficient of thermal Expansion of Liquid @ 25 C 0.0818 1/C
15
 Surface Tension @ -271 C 0.34 dynes/cm
16
 Density of Gas @ 1 atm and 70 F (21.1 C) 0.166 kg/m3 , 0.0104 lb/ft3
17
 Relative Density of Gas @ 1 atm and 70 F (Air =1) 0.138
18
 Enthalpy of Vaporization @ Boiling Point 19.99 kJ/kg , 8.6 BTU/lb
19
 Enthalpy of Fusion @ Melting Point 12.49 kJ/kg , 5.37 BTU/lb
20
 Heat Capacity of Gas @ 25 C , Constant Pressure (CP) 5.193 kJ/(kg K) , 1.241 BTU/(lb R)
21
 Heat Capacity of Gas @ 25 C , Constant Volume (CV) 3.116 kJ/(kg K) , 0.745 BTU/(lb R)
22
 Ratio of Heat Capacities for Gas , CP/CV 1.667
23
 Heat capacity of Liquid @ -270 C 2.47 kJ/(kg K) , 0.59 BTU/(lb R)
24
 Heat capacity of Solid @ -272 C 1.087 kJ/(kg K ) , 0.26 BTU/(lb R)
25
 Entropy of Gas @ 25 C 126.04 J/(mol K)
26
 Entropy of Formation of Gas @ 25 C 0 J/(mol K)
27
 Enthalpy of Formation of Gas @ 25 C 0 kJ/mol
28
 Gibbs Energy of Formation of Gas @ 25 C 0 kJ/mol
29
 Solubility Parameter 1.222 (J/cm3)^0.5
30
 Liquid Volume 32.257 cm3/mol
31
 Solubility in Water @ 25 C 1.51 parts per million (wt)
32
 Octanol-Water Partition Coefficient , log KOW
-
33
 Henry's Law Constant for Compound in Water @ 25 C 142950.4 atm/mol fraction
34
 Viscosity of Gas @ 25 C 198.57 micropoise
35
 Viscosity of Liquid @ -270 C 0.004 centipoise
36
 Thermal Conductivity of Gas @ 25 C 0.15016 watts/(m K)
37
 Thermal Conductivity of Liquid @ -270 C 0.016 watts/(m K)
38
 Lower Explosion Limit in Air
-
39
 Upper Explosion Limit in Air
-
40
 Flash Point Temperature
-
41
 Autoignition Temperature
-
42
 Enthalpy of Combustion @ 25 C (77 F)
-
43
 Threshold Limit Value (ACGIH)
-
44
 Permissible Exposure Limit (OSHA)
-
45
 Recommended Exposure Limit (NIOSH)
-

SECTION 9 STABILITY AND REACTIVITY
Reactivity Stable at normal temperature and pressure.
Conditions to avoid Protect from physical damage and heat. Containers may rupture or explode if exposed to heat.
Incompatibilities No data available.
Hazardous decomposition Thermal decomposition products: miscellaneous decomposition products
Polymerization Will not polymerize.

SECTION 10 TRANSPORT INFORMATION
Proper shipping name Helium, compressed
Labeling requirements Nonflammable gas

 

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