Boron

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Boron Rod

MATERIAL OVERVIEW

Characteristics: Nonmetallic element, black, hard solid; brown, amorphous powder; crystals.  Highly reactive. Soluble in concentrated nitric acid and sulfuric acid; insoluble in water, alcohol, and ether. High neutron absorption capacity. Low toxicity. Amphoteric. A plantmicronutrient. Mohs hardness 9.3.

Derivation: (a) by heating boric oxide with powdered magnesium or aluminum; (b) by vaporphase reduction of boron trichloride hydrogen over hot filaments (800-2000 oC); (c) electrolysis of fused salts.

Hazard: Boron powder may react violently with halogenated carbons. Reacts exothermally with metals over 900 oC; explodes with hydrogen iodide.

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GENERAL PROPERTIES

Symbol:

B

Atomic Number:

5

Atomic Weight:

10.81

Density:

2.34 cryst. gm/cc

Melting Point:

2079 oC

Boiling Point:

2550 oC

Thermal Conductivity:

0.274 W/cm/K @ 298.2 K

Electrical Resistivity:

1.8 x 1012 microhm-cm @ 0 oC

Electronegativity:

2.0 Paulings

Specific Heat:

0.245 Cal/g/K @ 25 oC

Heat of Vaporization:

128 K-Cal/gm atom at 2550 oC

Heat of Fusion:

5.3 Cal/gm mole

Heat of Sublimation:

133 + 4 K-Cal/mole @ 0 K

Vapor Pressure:

4.6 x 10-4 to 8.5 x 10-3 mm @2200 K

Heat of Combustion with O2:

 

150.49 K-Cal/mole @ 25 oC

149.79 K-Cal/mole @ 450 oC

Crystal Structure:

a-rhomohedral, b-rhombohedral and possible other forms

Energy Gap:

About 1.4 ev. @ 0 K

Hardness, Knoop:

100 gm load: 2500

Hardness, Mohs:

Approx. 9.3

Coefficient of expansion mean:

20-750 oC: 8.3 x 10-6 oC

Specific Magnetic Susceptibility:

-0.62 x 10-6 cgs @ 2000 oC (Diamagnetic)

Ductility:

Brittle

Bending Strength:

76,000 psi

Heat Content (Enthalpy):

290.4 Cal/mole @ 298.16 K

22,630 Cal/mole @ 3000 K

Entropy:

1.4 Cal/deg/mole @ 298.16 K; 16.5 @ 3000 K

Heat Capacity:

2.65 Cal/deg/mole @ 298.16 K; 7.1 @ 1200 K

TYPICAL ANALYSES - Impurities in ppm

Material / Purity:

1N82

2N5

6N

Al 800 200 <0.1
Fe 500 500 <1
Mg <100 - <1
Mn 130 100 <0.1
Si 12000 500 <0.1

BORON ROD, POWDER & LUMP

Material

Purity

Boron Rod 3-5mm, Irregular Diameter  6N
Boron Powder Amorphous 1N82
Boron Lump Crystalline, 2-12mm 2N5
Boron Powder Crystalline, -325 Mesh 2N

Rod is sold by the gram. Powder and lump are packaged to order and sold by the gram or kilogram. Call or This email address is being protected from spambots. You need JavaScript enabled to view it. for additional specifications or custom requirements.

BORON COMPOUNDS

Material

Purity

Boron Carbide, B4C, -325 Mesh msds1 2N5
Boron Nitride, BN, 1 Micron msds1 2N5
Boron Nitride, BN, -325 Mesh msds1 2N5
Boron Nitride, BN Sheet & Rod .250” to 1.0” msds1  
Boron Oxide, B2O3, 1" Pieces by Down msds1 2N5
Boron Oxide, B2O3, -200 Mesh msds1 5N

Compounds are packaged to order and sold by the gram or kilogram. Call or This email address is being protected from spambots. You need JavaScript enabled to view it. for additional specifications or custom requirements.

 

Material Safety Data  Sheet - MSDS
Boron MSDS
Technical Data Sheets
Boron Carbide
Boron Nitride
Boron Nitride Hot-Press
Understanding Mesh Sizes