Chemical Properties of Silicon
•Electrochemical Equivalent: 0.26197g/amp-hr
•Electron Work Function: 4.52eV
•Electronegativity (Pauling): 1.9
•Heat of Fusion: 50.55kJ/mol
•Incompatiblities:
Chlorine, fluorine, oxidizers, calcium, cesium carbide, alkaline carbonates
•Ionization Potential
First: 8.151
Second: 16.345
Third: 33.492
•valence Electron Potential (-eV): 144
Physical Properties of Silicon
Note: temperature and pressure sensitive calculations are based on normal temperature and pressure (20°C @ 1atm).
•Atomic Mass Average: 28.0855
•Boiling Point: 2628K 2355°C 4271°F
•Coefficient of Linear Thermal Expansion:
0.0000042cm/cm/°C (0°C)
•Conductivity
Electrical: 2.52E -12 106/cm
Thermal: 1.48 W/cmK
•Density: 2.33g/cc @ 300K
•Description:
Hard dark gray non-metal.
•Elastic Modulus:
Bulk: 100/GPa
Youngs: 47/GPa
•Enthalpy of Atomization: 439.3 kJ/mole @ 25°C
•Enthalpy of Fusion: 46.44 kJ/mole
•Enthalpy of Vaporization: 439 kJ/mole
•Flammablity Class: Combusrible Solid in powder form
•Freezing Point: see melting point
•Hardness Scale
Mohs: 6.5
•Heat of Vaporization: 384.22kJ/mol
•Melting Point: 1683K 1410°C 2570°F
•Molar Volume: 12.05 cm3/mole
•Optical Reflectivity: 28%
•Pysical State (at 20°C & 1atm): Solid
•Specific Heat: 0.71J/gK
•Vapor Pressure = 4.77@1410°C
Regulatory / Health
•CAS Number: 7440-21-3 amorphous powder
•UN/NA ID (ERG Guide Number): 1346 (170) amorphous powder
•RTECS: VW0400000
•OSHA Permissible Exposure Limit (PEL)
TWA: 15 mg/m3 total particulate
5 mg/m3 respirable particulate
•OSHA PEL Vacated 1989
TWA: 10 mg/m3 total particulate
5 mg/m3 respirable particulate
•NIOSH Recommended Exposure Limit (REL)
TWA: 10 mg/m3 total particulate
5 mg/m3 respirable particulate
•Routes of Exposure: Inhalation; Ingestion; Skin and/or eye contact
•Target Organs: Eyes, skin, respiratory system