For sale is 2 lbs of Boron Carbide powder. This was made by UK Abrasives. Model number NG44H.  Average particle size of this boron carbide is 44 micron. USPS shipping. The 2 lbs you receive is from a bulk barrel.

Appearance (dry state):

Color Black

Chemical composition: B + C min.98

Chemical formula: B4C Application

Grade NG (Nuclear)

B (Boron) min.76

C (Carbon) max. 24

B2O30.1

Fe(Iron) max. 0.1

Si(Silicon) 0.01

N (Nitrogen) 0.5

Isotope B10 (atomic weight) 19.5-21.5%

Physical data:Knoop hardness(0.1)3000

Mohs hardness <9.5

Specific gravity:2.51

Melting point:2723 °F

 Structure:Monocrystalline

Boron is an important material for nuclear

applications due to its high neutron absorption cross section (760

barn* at neutron velocity of 2200 m/sec). The cross section of the B10

isotope in boron is considerably higher (3800 barn). In addition, boron

doesn’t contain decay products with a long half-life and high-energy

secondary radioactive materials. Since pure boron is extremely brittle

and difficult to produce in shapes (for example: control rods) boron carbide is the material of choice

to use since it provides a high concentration of boron atoms in a

strong and refractory form and is relatively easy to fabricate.