McMaster-Carr logo
    Forward
    Enter e-mail addresses in the fields below
    Message
    Cancel
    Print
    How can we improve?
    Comments
    E-mail address (if you would like a response)
    31 Products
    About Composites
    industrial info icon

    Compare our offering of composites to find the right material for you.

    Nonporous Ceramic Alumina Powder

    Image of Product. Front orientation. Ceramic. Nonporous Ceramic Alumina Powder.
    Ceramic alumina withstands higher temperatures than any other ceramic and is highly chemical resistant. This powder is high purity, so it’s inert even at high temperatures. Because alumina is ultra hard, it can be used in applications that require superior strength. It is also wear resistant, making it suitable for high-wear applications. Both thermally and electrically insulating, alumina can also be used in high-temperature and high-power electrical applications. Finished products made from alumina powder are nonporous, so they will seal out air and gas. Powder is often used in casting processes. Add it to slurries to create custom parts and tools such as crucibles, cutting tools, and laboratory ware. Alumina powder also is often used as a friction material, such as in brake linings.
    Choose a particle size based on the application of your finished piece. Finer powders can be processed into finished pieces that will be harder, stronger, and more wear-resistant than those made with coarse grains. They may also have a finer finish. Parts made with coarse grain powders can be processed into pieces that are more porous and thermally shock-resistant than pieces made with finer grains. Mixing sizes can combine these properties.
    99.3% Aluminum Oxide—99.3% aluminum oxide powder is slightly more reactive than 99.5% aluminum oxide powder because it’s less pure. It’s commonly used for polishing, lapping, and buffing.
    99.5% Aluminum Oxide—99.5% aluminum oxide powder is more pure than 99.3% aluminum oxide, so it’s less reactive. It’s often used in the ceramic, glass, and foundry industries.
    Material Certificate Icon
    Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.
    5 lb. Pail
    10 lb. Pail
    25 lb. Pail
    Particle
    Size, μm
    Particle
    Mesh Size
    Fabrication
    Color
    Temp. Range,
    ° F
    Each
    Each
    Each
    99.3% Aluminum Oxide
     
    Fine Grit
    4 to 7—Heat TreatedWhite0 to 3,630000000000000000000000000000000000000000000
    70—Heat TreatedWhite0 to 3,630000000000000000000000000000000000000000
     
    99.5% Aluminum Oxide
     
    Fine Grit
    45325—White0 to 3,63000000000000000000000000000———0
    150100—White0 to 3,63000000000000000000000000000———0
     
    Medium Grit
    30048—White0 to 3,63000000000000000000000000000———0
    300 to 60025-40—White0 to 3,63000000000000000000000000000———0
     
    Coarse Grit
    600 to 1,40012-25—White0 to 3,63000000000000000000000000000———0
     

    Thermal-Shock-Resistant Mullite Ceramic Powder

    Image of Product. Front orientation. Ceramic. Thermal-Shock-Resistant Mullite Ceramic Powder.
    Mullite can withstand very high temperatures and will not deform or crack when repeatedly exposed to temperature fluctuations. Add it to slurries to create crucibles, ladles, and other parts by casting it. Mullite powder is common in furnaces, heaters, thermocouples, electrical insulation, and glass- and steel-industry refractories. When exposed to chemicals that are used to make steel, such as acid, it will not corrode. Due to fused fabrication, it has higher purity and more uniformity which leads to better thermal shock resistance and low thermal expansion.
    Choose a particle size based on the application of your finished piece. Finer powders can be processed into finished pieces that will be harder, stronger, and more wear-resistant than those made with coarse grains. They may also have a finer finish. Parts made with coarse grain powders can be processed into pieces that are more porous and thermally shock-resistant than pieces made with finer grains. Mixing sizes can combine these properties.
    Material Certificate Icon
    Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.
    Temp.,
    ° F
    5 lb. Pail
    10 lb. Pail
    25 lb. Pail
    Particle
    Size, μm
    Particle
    Mesh Size
    Color
    Min.
    Max.
    Performance
    Dielectric
    Strength
    Porosity
    Each
    Each
    Each
     
    Fine Grit
    0 to 45325White03,000Thermal Shock ResistantNot Rated6%000000000000000000000000000000000000000
     
    Medium Grit
    0 to 42540White03,000Thermal Shock ResistantNot Rated6%000000000000———0———0
    212 to 50035-70White03,000Thermal Shock ResistantNot Rated6%000000000000———0———0
     
    Coarse Grit
    500 to 2,00010-35White03,000Thermal Shock ResistantNot Rated6%000000000000———0———0
    2,000 to 2,3608-10White03,000Thermal Shock ResistantNot Rated6%000000000000———0———0
     

    High-Purity Acid-Resistant Green Silicon Carbide Powder

    Image of Product. Front orientation. Ceramic. High-Purity Acid-Resistant Green Silicon Carbide Powder.
    Highly pure, this green silicon carbide powder is consistent between batches and bonds better than less pure powders, yielding less cracking and wear in finished products. Products made from green silicon carbide are tough, have excellent corrosion resistance, and good thermal shock resistance. They’re often used in technical ceramics applications such as mechanical seals, thread guides, and heat exchangers.
    Silicon carbide is nearly chemically inert, meaning it won’t corrode in chemical processing environments. It’s good for use in rubbing parts such as bearings and bushings because it dissipates heat well and doesn’t warp from temperature swings. Mullite, however, is often preferred for applications that include rapid temperature swings. This silicon carbide operates in heat up to 3600° F, so it’s commonly used in furnaces and refractories. It’s so hard that it’s often used for body armor and abrasion processes such as pressure blasting. It’s more brittle than other ceramics, though, and is best used with low weight loads at slow to moderate speeds. This powder meets tightly graded, narrow size distribution JIS tolerance standards.
    Choose a particle size based on the application of your finished piece. Finer powders can be processed into finished pieces that will be harder, stronger, and more wear-resistant than those made with coarse grains. They may also have a finer finish. Parts made with coarse grain powders can be processed into pieces that are more porous and thermally shock-resistant than pieces made with finer grains. Mixing sizes can combine these properties.
    Temp.,
    ° F
    4.4 lb. Pail
    Particle
    Size, μm
    Color
    Min.
    Max.
    Performance
    Hardness
    JIS
    Specification
    Each
     
    Fine Grit
    2Green03,600Abrasion Resistant, Acid Resistant, Chemical Resistant, Semi-ConductiveMohs 9JIS R 6001000000000000000
    3Green03,600Abrasion Resistant, Acid Resistant, Chemical Resistant, Semi-ConductiveMohs 9JIS R 600100000000000000
    4Green03,600Abrasion Resistant, Acid Resistant, Chemical Resistant, Semi-ConductiveMohs 9JIS R 60010000000000000
    6.7Green03,600Abrasion Resistant, Acid Resistant, Chemical Resistant, Semi-ConductiveMohs 9JIS R 60010000000000000
    9.5Green03,600Abrasion Resistant, Acid Resistant, Chemical Resistant, Semi-ConductiveMohs 9JIS R 60010000000000000
    11.5Green03,600Abrasion Resistant, Acid Resistant, Chemical Resistant, Semi-ConductiveMohs 9JIS R 60010000000000000
    14Green03,600Abrasion Resistant, Acid Resistant, Chemical Resistant, Semi-ConductiveMohs 9JIS R 60010000000000000
    30Green03,600Abrasion Resistant, Acid Resistant, Chemical Resistant, Semi-ConductiveMohs 9JIS R 60010000000000000
     
    back to top