Boron

Print E-mail

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: Dust ignites spontaneously in air; severe fire and explosion hazard. Reacts exothermally with metals over 900 oC; explodes with hydrogen iodide.

To view a photo of the item hover over the camera_nopreview icon.

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:

2N5

2N8

5N5

6N

Fe <2000 <500 - -
Mg <100 <100 1.0 -
Si <2000 <500 <4 <2

BORON ROD, POWDER (CRYSTALS), SHOT, PELLETS, & INGOT

Material

Purity

Boron Rod 3-5mm, Irregular Diameter  6N
Boron Powder Amorphous 1N82
Boron Lump Crystalline, 3-8mm 2N5
Boron Powder Crystalline, -325 Mesh 2N

Rod is sold by the foot or meter. Powder, shot, pellets, and ingots are packaged to order and sold by the gram or kilogram. Call or This e-mail 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, -60 Mesh 2N5
Boron Carbide, B4C, -325 Mesh 2N5
Boron Carbide, B4C, 5 Microns or lower 2N5
Boron Nitride, BN, 1 Micron or lower 2N5
Boron Nitride, BN, -80 Mesh 1N75
Boron Nitride, BN Sheet & Rod .250” to 1.0” 1N75, 2N5
Boron Oxide, B2O3, 1/2" Pieces by Down 5N5
Boron Oxide, B2O3, -200 Mesh 1N8

Compounds are packaged to order and sold by the gram or kilogram. Call or This e-mail 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 Date Sheets
Boron Carbide
Boron Nitride
Boron Nitride Hot-Press
Understanding Mesh Sizes