Boron Carbide

Boron carbide (B4C) is a ceramic material composed of boron and carbon atoms. It is one of the hardest materials known to man, second only to diamond and cubic boron nitride. Boron carbide is often used in structural materials, ceramic materials, chemical raw materials, nuclear properties, electrical properties, etc. due to its advantages such as high melting point, high hardness, low density, stable chemical properties, and neutron absorption. Boron carbide is also used in ballistic armor due to its excellent hardness and ability to absorb and dissipate energy from high-velocity projectiles.

boron carbide
  • Moh’s hardness: 9.5+
  • Boron content: 78.28%
  • Carbon content: 21.72%
  • Density: 2.51g/cm³

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Particle Size

Boron carbide particle size sandF46 F60 F80 F90 F100 F120 F150 F180 F220
Boron carbide fine powderF230 F240 F280 F320 F360 F400  F500 F600 F800 F1000 F1200 F1500 W0.5
Boron carbide segmental sand60#-150#  
Boron carbide micro powder-325#  -200#  -100#


  • Exceptional hardness
    Boron carbide is one of the hardest known materials, only surpassed by diamond and cubic boron nitride.
  • High strength and stiffness
    Boron carbide possesses impressive mechanical properties, allowing it to withstand extreme forces.
  • Lightweight
    With a low density, boron carbide offers significant weight savings compared to traditional materials.
  • Excellent wear resistance
    Boron carbide’s hardness ensures minimal wear in abrasive applications.
  • Good chemical resistance
    Resistant to most acids and alkalis, boron carbide offers excellent corrosion resistance.


  • Abrasives: Used in grinding, polishing, and cutting applications for its exceptional hardness.
  • Armor and protective equipment: Ideal for lightweight, high-performance body and vehicle armor.
  • Nuclear industry: Utilized as a neutron absorber in control rods and shielding.
  • Refractories: Used in high-temperature applications for its thermal stability and chemical resistance.
  • Nozzles: Boron carbide nozzles provide exceptional wear resistance for abrasive blasting and spray applications.
B4C Applications


ParameterTypical Value(s)
Chemical FormulaB4C
Crystal StructureRhombohedral
Density2.52 g/cm³
Mohs Hardness9.5
Knoop Hardness2800-2900 kg/mm²
Elastic Modulus450-470 GPa
Flexural Strength350-400 MPa
Thermal Conductivity30-42 W/mK
Coefficient of Thermal Expansion4.5-5.0 x 10^(-6) /°C


20 Ton

No, diamond is the hardest material known to man, followed by cubic boron nitride and then boron carbide.

Yes, boron carbide is resistant to radiation and is being investigated as a material for nuclear wast

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