Corundum | McMaster-Carr

	Shape Shape


Round Tube	Sheet and Bar

Rod and Disc	Ball

Bead

	System of Measurement System of Measurement

Inch

Metric

	Length Length

	Diameter Diameter

	Thickness Thickness

	Width Width

	OD OD

	ID ID

	Maximum Temperature Maximum Temperature

	Porosity Porosity

13%

48%

Not Rated

	Compressive Strength Compressive Strength

4,350 psi

300,000 psi

	Density Density

0.075 lbs./cu. in.

0.13 lbs./cu. in.

0.14 lbs./cu. in.

	Thermal Conductivity Thermal Conductivity

159 Btu/hr. × in./sq. ft./°F @
68° F

171 Btu/hr. × in./sq. ft./°F @
68° F

4.5 Btu/hr. × in./sq. ft./°F @
212° F

194.5 Btu/hr. × in./sq. ft./°F @
212° F

	Hardness Hardness

	Flexural Strength Flexural Strength

3,150 psi

52,000 psi

54,000 psi

	Dielectric Strength Dielectric Strength

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	Tensile Strength Tensile Strength

31,000 psi

32,000 psi

	Refractive Index Refractive Index

1.77

1.78

	Modulus of Elasticity Modulus of Elasticity

0.054 ksi × 10⁶

0.044 ksi x 10⁶

	Wall Thickness Wall Thickness

236 Products

Nonporous Alumina Ceramic Tubes

Color: White
Max. Temperature: 3075° F
Fabrication: Fired
Porosity: 0%
Compressive Strength: 300,000 psi

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.

For technical drawings and 3-D models, click on a part number.

			6" Lg.		12" Lg.		24" Lg.
OD	ID	Wall Thick.		Each		Each		Each
0.050"	0.020"	0.015"	00000000	000000	00000000	000000	00000000	000000
0.063"	0.031"	0.016"	00000000	00000	00000000	00000	00000000	00000
0.094"	0.040"	0.027"	00000000	00000	00000000	00000	00000000	00000
0.094"	0.063"	0.016"	00000000	00000	00000000	00000	00000000	00000
0.100"	0.050"	0.025"	00000000	00000	00000000	00000	00000000	00000
1/8"	0.063"	0.031"	00000000	00000	0000000	00000	00000000	00000
0.156"	0.094"	0.031"	00000000	00000	0000000	00000	00000000	00000
0.187"	0.094"	0.047"	00000000	00000	0000000	00000	00000000	00000
0.187"	1/8"	0.032"	00000000	00000	0000000	00000	00000000	00000
0.219"	0.156"	0.031"	0000000	00000	00000000	00000	00000000	00000
1/4"	1/8"	0.063"	00000000	00000	0000000	00000	00000000	00000
1/4"	0.156"	0.047"	00000000	00000	0000000	00000	00000000	00000
1/4"	0.188"	0.031"	00000000	00000	0000000	00000	00000000	00000
0.313"	0.188"	0.063"	00000000	00000	00000000	00000	00000000	00000
0.313"	0.219"	0.047"	00000000	00000	00000000	00000	00000000	00000
3/8"	1/4"	0.063"	00000000	00000	0000000	00000	00000000	00000
0.438"	0.313"	0.063"	00000000	00000	00000000	00000	00000000	00000
1/2"	1/4"	0.125"	00000000	00000	0000000	00000	00000000	00000
1/2"	3/8"	0.063"	00000000	00000	0000000	00000	00000000	00000
0.590"	0.394"	0.098"	0000000	00000	0000000	00000	00000000	000000
0.590"	0.433"	0.078"	00000000	00000	00000000	00000	00000000	000000
5/8"	1/2"	0.063"	00000000	00000	0000000	00000	00000000	00000
0.688"	1/2"	0.094"	00000000	00000	00000000	00000	00000000	000000
3/4"	1/2"	0.125"	00000000	00000	0000000	00000	00000000	000000
3/4"	0.563"	0.094"	00000000	00000	00000000	00000	00000000	000000
7/8"	5/8"	0.125"	00000000	00000	00000000	00000	00000000	000000
1"	3/4"	0.125"	00000000	000000	00000000	000000	00000000	000000

Nonporous Alumina Ceramic Multiple-Bore Tubes

Two Bores

Four Bores

Color: White
Max. Temperature: 3075° F
Fabrication: Fired
Porosity: 0%
Compressive Strength: 300,000 psi

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.

For technical drawings and 3-D models, click on a part number.

			6" Lg.		18" Lg.		24" Lg.
Number of Bores	OD	ID		Each		Each		Each
2	0.063"	0.016"	00000000	000000	00000000	000000	000000	00
2	0.094"	0.025"	00000000	00000	00000000	00000	00000000	000000
2	0.109"	0.031"	00000000	00000	00000000	00000	00000000	00000
2	0.125"	0.031"	00000000	00000	00000000	00000	00000000	00000
2	0.125"	0.040"	00000000	00000	00000000	00000	00000000	00000
2	0.156"	0.052"	00000000	00000	00000000	00000	00000000	00000
2	0.188"	0.040"	00000000	00000	00000000	00000	000000	00
2	0.188"	0.047"	00000000	00000	000000	00	000000	00
2	0.188"	0.063"	00000000	00000	00000000	00000	00000000	00000
2	0.200"	0.052"	00000000	00000	00000000	00000	000000	00
2	0.240"	0.078"	00000000	00000	00000000	00000	00000000	00000
2	0.250"	0.063"	00000000	00000	00000000	00000	00000000	00000
4	0.063"	0.016"	00000000	00000	000000	00	000000	00
4	0.085"	0.024"	00000000	00000	000000	00	00000000	000000
4	0.094"	0.020"	00000000	00000	000000	00	000000	00
4	0.109"	0.020"	00000000	00000	00000000	00000	00000000	00000
4	0.188"	0.031"	00000000	00000	00000000	00000	00000000	00000
4	0.188"	0.047"	00000000	0000	00000000	00000	00000000	00000
4	0.219"	0.050"	00000000	00000	00000000	00000	00000000	00000
4	0.258"	0.078"	00000000	00000	00000000	00000	00000000	00000

Nonporous Alumina Ceramic Sheets and Bars

Color: White
Max. Temperature: See table
Fabrication: Fired
Electrical Properties: 4 1/2" × 4 1/2" sheets are electrical insulating
Dielectric Strength: See table
Porosity: See table
Compressive Strength: 300,000 psi

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.

For technical drawings and 3-D models, click on a part number.

Sheets

Thick.	Thick. Tolerance	Wd.	Lg.	Max. Temperature, °F	Dielectric Strength, V/mil	Porosity		Each
0.010"	-0.001" to 0.001"	4 1/2"	4 1/2"	3100°	250	Not Rated	0000000	000000
0.015"	-0.002" to 0.002"	4 1/2"	4 1/2"	2910°	210	13%	0000000	00000
0.020"	-0.002" to 0.002"	4 1/2"	4 1/2"	2910°	210	13%	0000000	00000
0.025"	-0.006" to 0.006"	4 1/2"	4 1/2"	3100°	250	Not Rated	0000000	00000
0.030"	-0.003" to 0.003"	4 1/2"	4 1/2"	2910°	210	13%	0000000	00000
0.035"	-0.004" to 0.004"	4 1/2"	4 1/2"	2910°	210	13%	0000000	00000
0.040"	-0.004" to 0.004"	4 1/2"	4 1/2"	2910°	210	13%	0000000	00000
0.060"	-0.002" to 0.002"	4 1/2"	4 1/2"	3100°	250	Not Rated	0000000	00000
0.080"	-0.002" to 0.002"	4 1/2"	4 1/2"	3100°	250	Not Rated	0000000	00000
0.100"	-0.008" to 0.008"	4 1/2"	4 1/2"	3100°	250	Not Rated	0000000	00000
0.157"	-0.050" to 0.050"	2"	4 1/4"	3075°	220	13%	0000000	000000
0.177"	-0.050" to 0.050"	3"	6 1/4"	3075°	220	13%	0000000	000000
0.197"	-0.050" to 0.050"	4"	8 1/2"	3075°	220	13%	0000000	000000

Bars

						12" Lg.
Thick.	Thick. Tolerance	Wd.	Max. Temperature, °F	Dielectric Strength, V/mil	Porosity		Each
0.125"	-0.004" to 0.004"	1/8"	3075°	220	13%	00000000	000000
0.250"	-0.008" to 0.008"	1/4"	3075°	220	13%	00000000	00000

Nonporous Alumina Ceramic Rods and Discs

Color: White
Max. Temperature: 3075° F
Fabrication: Fired
Porosity: 0%
Compressive Strength: 300,000 psi

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.

For technical drawings and 3-D models, click on a part number.

Rods

		6" Lg.		12" Lg.
Dia.	Dia. Tolerance		Each		Each
1/16"	-0.001" to 0.001"	00000000	000000	00000000	000000
1/8"	-0.004" to 0.004"	00000000	00000	00000000	00000
3/16"	-0.006" to 0.006"	00000000	00000	00000000	00000
13/64"	-0.012" to 0.000"	000000	00	00000000	00000
1/4"	-0.008" to 0.008"	00000000	00000	00000000	00000
5/16"	-0.009" to 0.009"	000000	00	00000000	00000
3/8"	-0.011" to 0.011"	00000000	00000	00000000	00000
1/2"	-0.015" to 0.015"	00000000	00000	00000000	00000
5/8"	-0.031" to 0.031"	00000000	00000	00000000	000000
3/4"	-0.039" to 0.039"	00000000	00000	00000000	000000

Discs

Dia.	Dia. Tolerance	Lg.		Each
1"	-0.050" to 0.050"	1/16"	0000000	000000
2 1/2"	-0.125" to 0.125"	1/8"	0000000	00000
6"	-0.180" to 0.180"	3/16"	0000000	000000

Nonporous Alumina Ceramic Balls

Color: White
Max. Temperature: 2000° F
Fabrication: Fired
Porosity: 0%
Compressive Strength: 300,000 psi

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.

For technical drawings and 3-D models, click on a part number.

Dia.	Dia. Tolerance	Sphericity		Each
1/8"	-0.0001" to 0.0001"	99.9975%	0000000	00000
3/16"	-0.0001" to 0.0001"	99.9975%	0000000	0000
7/32"	-0.0001" to 0.0001"	99.99%	0000000	0000
1/4"	-0.0001" to 0.0001"	99.9975%	0000000	0000
9/32"	-0.0001" to 0.0001"	99.99%	0000000	0000
5/16"	-0.0001" to 0.0001"	99.9975%	0000000	0000
3/8"	-0.0001" to 0.0001"	99.9975%	0000000	0000
1/2"	-0.0001" to 0.0001"	99.9975%	0000000	0000
5/8"	-0.0010" to 0.0010"	99.99%	0000000	00000
3/4"	-0.0010" to 0.0010"	99.99%	0000000	00000
1"	-0.0010" to 0.0010"	99.99%	0000000	00000
3mm	-0.0001" to 0.0001"	99.99%	0000000	0000
4mm	-0.0001" to 0.0001"	99.99%	0000000	0000
5mm	-0.0001" to 0.0001"	99.99%	0000000	0000
7mm	-0.0001" to 0.0001"	99.99%	0000000	0000
8mm	-0.0001" to 0.0001"	99.99%	0000000	0000
9mm	-0.0001" to 0.0001"	99.99%	0000000	0000
10mm	-0.0001" to 0.0001"	99.99%	000000	00000
11mm	-0.0001" to 0.0001"	99.99%	0000000	0000
12mm	-0.0001" to 0.0001"	99.99%	0000000	00000
16mm	-0.0001" to 0.0001"	99.99%	0000000	00000
17mm	-0.0001" to 0.0001"	99.99%	0000000	00000
20mm	-0.0001" to 0.0001"	99.99%	0000000	00000
25mm	-0.0001" to 0.0001"	99.99%	0000000	00000

Nonporous Alumina Ceramic Beads

Color: White
Max. Temperature: 3075° F
Fabrication: Fired
Porosity: 0%
Compressive Strength: 300,000 psi

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.

For technical drawings and 3-D models, click on a part number.

OD	ID	Lg.	Pkg. Qty.		Pkg.
0.090"	0.040"	1/8"	5	00000000	00000
0.170"	0.065"	0.188"	5	00000000	0000
0.330"	0.133"	0.313"	5	00000000	00000

Tight-Tolerance Nonporous Alumina Ceramic Rods

Color: White
Max. Temperature: 3075° F
Fabrication: Fired
Porosity: 0%
Compressive Strength: 300,000 psi

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.

For technical drawings and 3-D models, click on a part number.

		12" Lg.		24" Lg.		36" Lg.
Dia.	Dia. Tolerance		Each		Each		Each
1/16"	-0.001" to 0.001"	0000000	000000	000000	00	000000	00
5/64"	-0.001" to 0.001"	0000000	00000	000000	00	000000	00
1/8"	-0.001" to 0.001"	0000000	00000	0000000	0000000	0000000	0000000
3/16"	-0.001" to 0.001"	0000000	00000	000000	00	0000000	000000
1/4"	-0.001" to 0.001"	0000000	00000	0000000	000000	0000000	000000
3/8"	-0.001" to 0.001"	0000000	000000	0000000	000000	0000000	000000
1/2"	-0.001" to 0.001"	0000000	000000	0000000	000000	000000	00

Ultra-High-Temperature Easy-to-Machine Alumina Ceramic Sheets

Color: White
Max. Temperature: 3000° F
Fabrication: Fired
Porosity: 48%
Compressive Strength: 4,350 psi

Commonly used in induction furnace components and hot glass handling, this alumina ceramic 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.

For technical drawings and 3-D models, click on a part number.

		3" × 3"		6" × 6"		12" × 12"		24" × 24"
Thick.	Thick. Tolerance		Each		Each		Each		Each
1/32"	-0.020" to 0.020"	00000000	000000	00000000	000000	00000000	0000000	000000	00
1/16"	-0.020" to 0.020"	00000000	00000	0000000	000000	00000000	000000	00000000	0000000
1/8"	-0.035" to 0.035"	00000000	00000	0000000	000000	00000000	000000	00000000	000000
3/16"	-0.040" to 0.040"	00000000	000000	000000	000000	00000000	000000	00000000	000000
1/4"	-0.050" to 0.050"	00000000	000000	0000000	000000	00000000	000000	00000000	00000000
1/2"	-0.065" to 0.065"	00000000	000000	0000000	000000	00000000	000000	00000000	00000000

Ultra-High-Temperature Easy-to-Machine Alumina Ceramic Rods

Color: White
Max. Temperature: 3000° F
Fabrication: Fired
Porosity: 48%
Compressive Strength: 4,350 psi

For technical drawings and 3-D models, click on a part number.

		12" Lg.
Dia.	Dia. Tolerance		Each
1/2"	-0.063" to 0.063"	0000000	0000000
3/4"	-0.063" to 0.063"	0000000	000000
1"	-0.063" to 0.063"	0000000	000000
1 1/2"	-0.063" to 0.063"	0000000	000000