McMaster-Carr logo
    Filter by
    System of Measurement
    Export Control Classification Number (ECCN)
    Industrial Info Snippet
    U.S.–Mexico–Canada Agreement (USMCA) Qualifying
    DFARS Specialty Metals
    Refractive Index
    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)
    217 Products
    About Composites
    industrial info icon

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

    Nonporous Ceramic Alumina Rods and Discs

    Seal out air and gas in high-temperature and high-wear applications. This ultrahard ceramic can also be used in applications that require superior strength.
    Rods
    Image of Product. Front orientation. Ceramic. Nonporous Ceramic Alumina Rods and Discs.
    Temp.
    6" Lg.
    12" Lg.
    Dia.
    Dia. Tolerance
    Color
    Min.
    Max.,
    ° F
    Fabrication
    Dielectric Strength,
    V/mil
    Porosity
    Compressive
    Strength, psi
    Hardness
    Each
    Each
    1/16"-0.001" to 0.001"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 8387065K7100000087065K41000000
    1/8"-0.004" to 0.004"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 8387065K720000087065K4200000
    3/16"-0.006" to 0.006"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 8387065K730000087065K4400000
    13/64"-0.012" to 0.000"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 83———087065K4500000
    1/4"-0.008" to 0.008"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 8387065K740000087065K4600000
    5/16"-0.009" to 0.009"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 83———087065K4800000
    3/8"-0.011" to 0.011"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 8387065K750000087065K4900000
    1/2"-0.015" to 0.015"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 8387065K760000087065K5100000
    5/8"-0.031" to 0.031"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 8387065K770000087065K53000000
    3/4"-0.039" to 0.039"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 8387065K780000087065K55000000
     
    Discs
    Image of Product. Front orientation. Ceramic. Nonporous Ceramic Alumina Rods and Discs.
    Temp.
    1/16" Lg.
    1/8" Lg.
    3/16" Lg.
    Dia.
    Dia. Tolerance
    Color
    Min.
    Max.,
    ° F
    Fabrication
    Dielectric Strength,
    V/mil
    Porosity
    Compressive
    Strength, psi
    Hardness
    Each
    Each
    Each
    1"-0.050" to 0.050"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 838464K22000000———0———0
    2 1/2"-0.125" to 0.125"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 83———08464K29000000———0
    6"-0.180" to 0.180"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 83———0———08464K390000000
     

    Nonporous Ceramic Alumina Balls

    Image of Product. Front orientation. Ceramic. Nonporous Ceramic Alumina Balls.
    Seal out air and gas in high-temperature and high-wear applications. This ultrahard ceramic can also be used in applications that require superior strength.
    Temp.
    Dia.
    Dia. Tolerance
    Sphericity
    Percentage
    Color
    Min.
    Max.,
    ° F
    Fabrication
    Dielectric Strength,
    V/mil
    Porosity
    Compressive
    Strength, psi
    Hardness
    Each
    1/8"-0.0001" to 0.0001"99.9975%WhiteNot Rated2,000Fired220Not Rated300,000Rockwell 45N 839599K1100000
    3/16"-0.0001" to 0.0001"99.9975%WhiteNot Rated2,000Fired220Not Rated300,000Rockwell 45N 839599K120000
    1/4"-0.0001" to 0.0001"99.9975%WhiteNot Rated2,000Fired220Not Rated300,000Rockwell 45N 839599K130000
    5/16"-0.0001" to 0.0001"99.9975%WhiteNot Rated2,000Fired220Not Rated300,000Rockwell 45N 839599K140000
    3/8"-0.0001" to 0.0001"99.9975%WhiteNot Rated2,000Fired220Not Rated300,000Rockwell 45N 839599K150000
    1/2"-0.0001" to 0.0001"99.9975%WhiteNot Rated2,000Fired220Not Rated300,000Rockwell 45N 839599K160000
    5/8"-0.0010" to 0.0010"99.99%WhiteNot Rated2,000Fired220Not Rated300,000Rockwell 45N 839599K1700000
    3/4"-0.0010" to 0.0010"99.99%WhiteNot Rated2,000Fired220Not Rated300,000Rockwell 45N 839599K2300000
    1"-0.0010" to 0.0010"99.99%WhiteNot Rated2,000Fired220Not Rated300,000Rockwell 45N 839599K2500000
    3 mm-0.0001" to 0.0001"99.99%WhiteNot Rated2,000Fired220Not Rated300,000Rockwell 45N 839599K340000
    4 mm-0.0001" to 0.0001"99.99%WhiteNot Rated2,000Fired220Not Rated300,000Rockwell 45N 839599K350000
    16 mm-0.0001" to 0.0001"99.99%WhiteNot Rated2,000Fired220Not Rated300,000Rockwell 45N 839599K4300000
    20 mm-0.0001" to 0.0001"99.99%WhiteNot Rated2,000Fired220Not Rated300,000Rockwell 45N 839599K4500000
    25 mm-0.0001" to 0.0001"99.99%WhiteNot Rated2,000Fired220Not Rated300,000Rockwell 45N 839599K4600000
     

    Nonporous Ceramic Alumina Sheets and Bars

    Seal out air and gas in high-temperature and high-wear applications. This ultrahard ceramic can also be used in applications that require superior strength.
    Sheets
    Image of Product. Front orientation. Ceramic. Nonporous Ceramic Alumina Sheets and Bars.
    Temp.
    Thk.
    Thk. Tolerance
    Wd.
    Lg.
    Min.
    Max.,
    ° F
    Dielectric Strength,
    V/mil
    Color
    Fabrication
    Performance
    Porosity
    Compressive
    Strength, psi
    Each
    0.025"-0.006" to 0.006"4 1/2"4 1/2"Not Rated3,100250WhiteFiredElectrically Insulating0%300,0008462K43000000
    0.040"-0.004" to 0.004"4 1/2"4 1/2"Not Rated2,910210WhiteFiredElectrically Insulating0%300,0008462K2300000
    0.157"-0.050" to 0.050"2"4 1/4"Not Rated3,075220WhiteFired—0%300,0008459K22000000
    0.177"-0.050" to 0.050"3"6 1/4"Not Rated3,075220WhiteFired—0%300,0008459K24000000
    0.197"-0.050" to 0.050"4"8 1/2"Not Rated3,075220WhiteFired—0%300,0008459K26000000
    Bars
    Image of Product. Front orientation. Ceramic. Nonporous Ceramic Alumina Sheets and Bars.
    Temp.
    Thk.
    Thk. Tolerance
    Wd.
    Lg.
    Min.
    Max.,
    ° F
    Dielectric Strength,
    V/mil
    Color
    Fabrication
    Porosity
    Compressive
    Strength, psi
    Each
    0.125"-0.004" to 0.004"1/8"12"Not Rated3,075220WhiteFired0%300,00087125K62000000
    0.250"-0.008" to 0.008"1/4"12"Not Rated3,075220WhiteFired0%300,00087125K6400000

    Long-Lasting Lapping Compound Paste

    Image of Product. Front orientation. Lapping Compounds. Long-Lasting Lapping Compound Paste.
    Denser and more wear-resistant than traditional lapping compounds. This paste is oil soluble and won't cause corrosion. Apply to your workpiece with cylinder laps, buffing wheels and bobs, or lapping sticks to produce a level, scratch-free surface. Grit and microns are approximate.
    16 oz. Jar
    Abrasive
    Grain Size, μm
    Grit (For
    Finish)
    For Use
    On
    Each
    Synthetic Sapphire
     
    Oil Soluble
    12200 (Polished)Steel4778A50000000
     

    Ultra-High-Temperature Easy-Machine Ceramic Alumina Sheets

    Image of Product. Front orientation. Ceramic. Ultra-High-Temperature Easy-Machine Ceramic Alumina Sheets.
    Commonly used in induction furnace components and hot glass handling, this ceramic alumina withstands higher temperatures than alumina bisque ceramic. The 99% alumina content makes it suitable for high-vacuum applications. It has excellent machinability. Material comes fired and is unaffected by water.
    Temp.
    3" × 3"
    6" × 6"
    12" × 12"
    24" × 24"
    Thk.
    Thk. Tolerance
    Color
    Min.
    Max.,
    ° F
    Fabrication
    Performance
    Dielectric Strength,
    V/mil
    Porosity
    Compressive
    Strength, psi
    Hardness
    Each
    Each
    Each
    Each
    1/32"-0.020" to 0.020"WhiteNot Rated3,000FiredEasy Machine, Ultra High Temperature7548%4,350Durometer 86D8978T7930000008978T79900000008978T8010000000———0
    1/16"-0.020" to 0.020"WhiteNot Rated3,000FiredEasy Machine, Ultra High Temperature7548%4,350Durometer 86D8978T794000008978T610000008978T8020000008978T7820000000
    1/8"-0.035" to 0.035"WhiteNot Rated3,000FiredEasy Machine, Ultra High Temperature7548%4,350Durometer 86D8978T795000008978T630000008978T8030000008978T783000000
    3/16"-0.040" to 0.040"WhiteNot Rated3,000FiredEasy Machine, Ultra High Temperature7548%4,350Durometer 86D8978T796000008978T80000008978T8040000008978T78400000000
    1/4"-0.050" to 0.050"WhiteNot Rated3,000FiredEasy Machine, Ultra High Temperature7548%4,350Durometer 86D8978T797000008978T650000008978T8050000008978T78500000000
    1/2"-0.065" to 0.065"WhiteNot Rated3,000FiredEasy Machine, Ultra High Temperature7548%4,350Durometer 86D8978T7980000008978T670000008978T8060000008978T78600000000
     

    Nonporous Ceramic Alumina Tubes

    Image of Product. Front orientation. Ceramic. Nonporous Ceramic Alumina Tubes.
    Seal out air and gas in high-temperature and high-wear applications. This ultrahard ceramic can also be used in applications that require superior strength.
    Temp.
    6" Lg.
    12" Lg.
    24" Lg.
    OD
    ID
    Wall
    Thk.
    Color
    Min.
    Max.,
    ° F
    Fabrication
    Dielectric Strength,
    V/mil
    Porosity
    Compressive
    Strength, psi
    Hardness
    Each
    Each
    Each
    0.050"0.020"0.015"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 838746K5860000008746K4310000008746K432000000
    0.063"0.031"0.016"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 838746K587000008746K451000008746K45200000
    0.094"0.040"0.027"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 838746K553000008746K584000008746K58500000
    0.094"0.063"0.016"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 838746K554000008746K461000008746K46200000
    0.100"0.050"0.025"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 838746K555000008746K578000008746K58100000
    1/8"0.063"0.031"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 838746K556000008746K11000008746K31200000
    0.156"0.094"0.031"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 838746K557000008746K12000008746K32200000
    0.187"0.094"0.047"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 838746K558000008746K13000008746K33200000
    0.187"1/8"0.032"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 838746K559000008746K14000008746K34200000
    0.219"0.156"0.031"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 838746K56000008746K471000008746K47200000
    1/4"1/8"0.063"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 838746K561000008746K15000008746K35200000
    1/4"0.156"0.047"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 838746K562000008746K16000008746K36200000
    1/4"0.188"0.031"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 838746K563000008746K17000008746K37200000
    0.313"0.188"0.063"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 838746K564000008746K579000008746K58200000
    0.313"0.219"0.047"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 838746K565000008746K481000008746K48200000
    3/8"1/4"0.063"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 838746K566000008746K18000008746K38200000
    0.438"0.313"0.063"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 838746K567000008746K491000008746K49200000
    1/2"1/4"0.125"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 838746K568000008746K19000008746K39200000
    1/2"3/8"0.063"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 838746K569000008746K21000008746K412000000
    0.590"0.394"0.098"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 838746K57000008746K58000008746K58300000
    0.590"0.433"0.078"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 838746K571000008746K511000008746K512000000
    5/8"1/2"0.063"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 838746K572000008746K22000008746K42200000
    0.688"1/2"0.094"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 838746K573000008746K521000008746K522000000
    3/4"1/2"0.125"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 838746K574000008746K24000008746K442000000
    3/4"0.563"0.094"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 838746K575000008746K531000008746K532000000
    7/8"5/8"0.125"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 838746K576000008746K5410000008746K542000000
    1"3/4"0.125"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 838746K5770000008746K5510000008746K552000000
     

    Nonporous Ceramic Alumina Beads

    Image of Product. Front orientation. Ceramic. Nonporous Ceramic Alumina Beads.
    Often used as wire insulation. Seal out air and gas in high-temperature and high-wear applications. This ultrahard ceramic can also be used in applications that require superior strength.
    Temp.
    1/8" Lg.
    0.188" Lg.
    0.313" Lg.
    OD
    ID
    Color
    Min.
    Max.,
    ° F
    Fabrication
    Dielectric
    Strength
    Porosity
    Compressive
    Strength, psi
    Hardness
    Pkg.
    Qty.
    Pkg.
    Pkg.
    Qty.
    Pkg.
    Pkg.
    Qty.
    Pkg.
    0.090"0.040"WhiteNot Rated3,075FiredNot Rated0%300,000Not Rated587085K6100000————0————0
    0.170"0.065"WhiteNot Rated3,075FiredNot Rated0%300,000Not Rated————0587085K63000000————0
    0.330"0.133"WhiteNot Rated3,075FiredNot Rated0%300,000Not Rated————0————0587085K65000000
     

    Ultra-High-Temperature Easy-Machine Ceramic Alumina Rods

    Image of Product. Front orientation. Ceramic. Ultra-High-Temperature Easy-Machine Ceramic Alumina Rods.
    Commonly used in induction furnace components and hot glass handling, this ceramic alumina withstands higher temperatures than alumina bisque ceramic. The 99% alumina content makes it suitable for high-vacuum applications. It has excellent machinability. Material comes fired and is unaffected by water.
    Temp.
    12" Lg.
    Dia.
    Dia. Tolerance
    Color
    Min.
    Max.,
    ° F
    Fabrication
    Performance
    Dielectric Strength,
    V/mil
    Porosity
    Compressive
    Strength, psi
    Hardness
    Each
    1/2"-0.063" to 0.063"WhiteNot Rated3,000FiredEasy Machine, Ultra High Temperature7548%4,350Durometer 86D8978T710000000
    3/4"-0.063" to 0.063"WhiteNot Rated3,000FiredEasy Machine, Ultra High Temperature7548%4,350Durometer 86D8978T73000000
    1"-0.063" to 0.063"WhiteNot Rated3,000FiredEasy Machine, Ultra High Temperature7548%4,350Durometer 86D8978T75000000
    1 1/2"-0.063" to 0.063"WhiteNot Rated3,000FiredEasy Machine, Ultra High Temperature7548%4,350Durometer 86D8978T77000000
     

    Tight-Tolerance Nonporous Ceramic Alumina Rods

    Image of Product. Front orientation. Ceramic. Tight-Tolerance Nonporous Ceramic Alumina Rods.
    Seal out air and gas in high-temperature and high-wear applications. This ultrahard ceramic can also be used in applications that require superior strength.
    Temp.
    12" Lg.
    24" Lg.
    36 Lg.
    Dia.
    Dia. Tolerance
    Color
    Min.
    Max.,
    ° F
    Fabrication
    Dielectric Strength,
    V/mil
    Porosity
    Compressive
    Strength, psi
    Hardness
    Each
    Each
    Each
    1/16"-0.001" to 0.001"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 838446K21000000———0———0
    5/64"-0.001" to 0.001"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 838446K2200000———0———0
    1/8"-0.001" to 0.001"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 838446K11000008446K2500000008446K260000000
    3/16"-0.001" to 0.001"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 838446K1300000———08446K28000000
    1/4"-0.001" to 0.001"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 838446K15000008446K290000008446K31000000
    3/8"-0.001" to 0.001"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 838446K170000008446K320000008446K33000000
    1/2"-0.001" to 0.001"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 838446K190000008446K34000000———0
     

    Nonporous Ceramic Alumina Multiple-Bore Tubes

    Image of Product. Front orientation. Ceramic. Nonporous Ceramic Alumina Multiple-Bore Tubes, 2 Bores.
    Image of Product. Front orientation. Ceramic. Nonporous Ceramic Alumina Multiple-Bore Tubes, 4 Bores.

    2 Bores

    4 Bores

    Seal out air and gas in high-temperature and high-wear applications. This ultrahard ceramic can also be used in applications that require superior strength.
    Temp.
    6" Lg.
    18" Lg.
    24" Lg.
    No. of
    Bores
    OD
    ID
    Color
    Min.
    Max.,
    ° F
    Fabrication
    Dielectric Strength,
    V/mil
    Porosity
    Compressive
    Strength, psi
    Hardness
    Each
    Each
    Each
    20.063"0.016"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 8387175K1100000087175K12000000———0
    20.094"0.025"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 8387175K140000087175K710000087175K73000000
    20.109"0.031"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 8387175K150000087175K160000087175K1700000
    20.125"0.031"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 8387175K180000087175K190000087175K2100000
    20.125"0.040"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 8387175K2200000———087175K7900000
    20.125"0.04"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 83———087175K7700000———0
    20.156"0.052"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 8387175K230000087175K240000087175K2500000
    20.188"0.040"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 8387175K260000087175K2700000———0
    20.188"0.047"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 8387175K2900000———0———0
    20.188"0.063"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 8387175K330000087175K830000087175K8400000
    20.200"0.052"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 8387175K340000087175K3500000———0
    20.240"0.078"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 8387175K410000087175K420000087175K4300000
    20.250"0.063"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 8387175K370000087175K380000087175K3900000
    40.062"0.016"Off-WhiteNot Rated3,180Fired3200%384,000Rockwell C7187175K43300000———0———0
    40.094"0.020"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 8387175K5100000———0———0
    40.109"0.020"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 8387175K540000087175K550000087175K5600000
    40.188"0.031"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 8387175K570000087175K910000087175K9300000
    40.188"0.047"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 8387175K580000087175K590000087175K6100000
    40.219"0.050"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 8387175K620000087175K630000087175K6400000
    40.258"0.078"WhiteNot Rated3,075Fired2200%300,000Rockwell 45N 8387175K650000087175K660000087175K6700000
     
    back to top