Alumina Oxide Sheets | McMaster-Carr

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Material

High-Purity Ceramic Alumina

Abrasive Material

Ceramic Alumina

System of Measurement

Thickness

Shape

Width

Length

Maximum Temperature

Color

Porosity

Performance

Electrical Insulating

Fast Cut

Tear Resistant

Ultra High Temperature

Hardness

Thermal Conductivity @ Temperature

159 BTU⋅in/(hr⋅ft²⋅°F) @ 68° F

171 BTU⋅in/(hr⋅ft²⋅°F) @ 68° F

4.5 BTU⋅in/(hr⋅ft²⋅°F) @ 212° F

194.5 BTU⋅in/(hr⋅ft²⋅°F) @ 212° F

Fabrication

Dielectric Strength

Flexural Strength

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Clarity

RoHS

For Use On

Compressive Strength

REACH

Density

Export Control Classification Number (ECCN)

1C007

EAR99

DFARS Specialty Metals

Tensile Strength

94 Products

About Composites

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

Nonporous Ceramic Alumina Sheets and Bars

Made from nonporous alumina, these sheets and bars resist gas and air permeation for sealed furnace linings, kiln furniture, and vacuum-system components. Alumina's high hardness and compressive strength outperform metals and most other ceramics in abrasive environments.

Sheets

				Temp.
Thk.	Thk. Tolerance	Wd.	Lg.	Min.	Max., ° F	Dielectric Strength, V/mil	Color	Fabrication	Performance	Porosity	Compressive Strength, psi		Each
0.010"	-0.001" to 0.001"	4 1/2"	4 1/2"	Not Rated	3,100	250	White	Fired	Electrical Insulating	0%	300,000	8462K42	000000
0.015"	-0.002" to 0.002"	4 1/2"	4 1/2"	Not Rated	2,910	210	White	Fired	Electrical Insulating	0%	300,000	8462K24	00000
0.020"	-0.002" to 0.002"	4 1/2"	4 1/2"	Not Rated	2,910	210	White	Fired	Electrical Insulating	0%	300,000	8462K26	00000
0.025"	-0.006" to 0.006"	4 1/2"	4 1/2"	Not Rated	3,100	250	White	Fired	Electrical Insulating	0%	300,000	8462K43	00000
0.030"	-0.003" to 0.003"	4 1/2"	4 1/2"	Not Rated	2,910	210	White	Fired	Electrical Insulating	0%	300,000	8462K27	00000
0.035"	-0.004" to 0.004"	4 1/2"	4 1/2"	Not Rated	2,910	210	White	Fired	Electrical Insulating	0%	300,000	8462K28	000000
0.040"	-0.004" to 0.004"	4 1/2"	4 1/2"	Not Rated	2,910	210	White	Fired	Electrical Insulating	0%	300,000	8462K23	00000
0.060"	-0.002" to 0.002"	4 1/2"	4 1/2"	Not Rated	3,100	250	White	Fired	Electrical Insulating	0%	300,000	8462K45	000000
0.080"	-0.002" to 0.002"	4 1/2"	4 1/2"	Not Rated	3,100	250	White	Fired	Electrical Insulating	0%	300,000	8462K51	000000
0.100"	-0.008" to 0.008"	4 1/2"	4 1/2"	Not Rated	3,100	250	White	Fired	Electrical Insulating	0%	300,000	8462K52	000000
0.157"	-0.050" to 0.050"	2"	4 1/4"	Not Rated	3,075	220	White	Fired	—	0%	300,000	8459K22	000000
0.177"	-0.050" to 0.050"	3"	6 1/4"	Not Rated	3,075	220	White	Fired	—	0%	300,000	8459K24	000000
0.197"	-0.050" to 0.050"	4"	8 1/2"	Not Rated	3,075	220	White	Fired	—	0%	300,000	8459K26	000000

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 Rated	3,075	220	White	Fired	0%	300,000	87125K62	000000
0.250"	-0.008" to 0.008"	1/4"	12"	Not Rated	3,075	220	White	Fired	0%	300,000	87125K64	00000

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"	White	Not Rated	3,000	Fired	Easy Machine, Ultra High Temperature	75	48%	4,350	Durometer 86D	8978T793	000000	8978T799	0000000	8978T801	0000000	———	0


	1/16"	-0.020" to 0.020"	White	Not Rated	3,000	Fired	Easy Machine, Ultra High Temperature	75	48%	4,350	Durometer 86D	8978T794	00000	8978T61	000000	8978T802	000000	8978T782	0000000
	1/8"	-0.035" to 0.035"	White	Not Rated	3,000	Fired	Easy Machine, Ultra High Temperature	75	48%	4,350	Durometer 86D	8978T795	00000	8978T63	000000	8978T803	000000	8978T783	000000
	3/16"	-0.040" to 0.040"	White	Not Rated	3,000	Fired	Easy Machine, Ultra High Temperature	75	48%	4,350	Durometer 86D	8978T796	00000	8978T8	000000	8978T804	000000	8978T784	00000000
	1/4"	-0.050" to 0.050"	White	Not Rated	3,000	Fired	Easy Machine, Ultra High Temperature	75	48%	4,350	Durometer 86D	8978T797	00000	8978T65	000000	8978T805	000000	8978T785	00000000
	1/2"	-0.065" to 0.065"	White	Not Rated	3,000	Fired	Easy Machine, Ultra High Temperature	75	48%	4,350	Durometer 86D	8978T798	000000	8978T67	000000	8978T806	000000	8978T786	00000000

Ultra-High-Temperature Ceramic Gasket Material

Our highest temperature gasket sheets, these are made of high-purity aluminum oxide ceramic and can withstand temperatures up to 2600° F. Use them when a strong seal is required in boilers and furnaces. Cut with a utility knife.

				0.06" Thick
Wd.	Lg.	Max. Temp., ° F	Color		Each
12"	12"	2,600	White	1687T21	0000000
12"	36"	2,600	White	1687T22	00000000

Sanding Rolls for Stainless Steel and Hard Metals

A sharp abrasive cuts through tough metals such as stainless steel, titanium, and iron. Trim these rolls for the length you need.

Cloth Abrasive Backing—Flexible and tear resistant, it's good for contoured or rounded surfaces where a rigid backing could crack or rip.

Ceramic Alumina Abrasive—The sharp edges cut quickly for efficient material removal.

Grit—The lower the grit number, the rougher the finish and the duller the appearance. The higher the grit number, the more polished the finish and the more satin or mirrored the appearance.

					45 ft. Long
	Wd.	Abrasive Material	For Use On	Grit		Each
Cloth Abrasive Backing







				For Rough Finish

				1"	Ceramic Alumina	Stainless Steel, Steel, Titanium, Iron, Nickel	36	8135N11	000000


				1"	Ceramic Alumina	Stainless Steel, Steel, Titanium, Iron, Nickel	60	8135N13	00000
				1"	Ceramic Alumina	Stainless Steel, Steel, Titanium, Iron, Nickel	80	8135N15	00000
				2"	Ceramic Alumina	Stainless Steel, Steel, Titanium, Iron, Nickel	36	8135N12	00000
				2"	Ceramic Alumina	Stainless Steel, Steel, Titanium, Iron, Nickel	60	8135N14	00000
				2"	Ceramic Alumina	Stainless Steel, Steel, Titanium, Iron, Nickel	80	8135N16	000000




						For Smooth Finish

						1"	Ceramic Alumina	Stainless Steel, Steel, Titanium, Iron, Nickel	180	8135N17	00000


						2"	Ceramic Alumina	Stainless Steel, Steel, Titanium, Iron, Nickel	180	8135N18	000000

Fast-Cutting Sanding Rolls

Precision-Shaped Ceramic Alumina

With precision-shaped abrasive, these rolls cut quickly and reduce heat to prevent wear. The grains continually fracture to expose fresh cutting edges while keeping their engineered points and angle. Trim them to length for jobs of any size.

Cloth Abrasive Backing—Flexible and tear resistant, it's good for contoured or rounded surfaces where a rigid backing could crack or rip.

Ceramic Alumina Abrasive—The sharp edges cut quickly for efficient material removal.

Grit—The lower the grit number, the rougher the finish. The higher the grit number, the finer the finish.

						45 ft. Long
	Wd.	Abrasive Material	For Use On	Mfr. Series	Grit		Each
Cloth Abrasive Backing







				For Rough Finish

				2 3/4"	Ceramic Alumina	Stainless Steel, Steel, Aluminum, Copper, Wood, Nickel	3M Cubitron	36	8096N101	0000000


				2 3/4"	Ceramic Alumina	Stainless Steel, Steel, Aluminum, Copper, Wood, Nickel	3M Cubitron	60	8096N103	000000
				2 3/4"	Ceramic Alumina	Stainless Steel, Steel, Aluminum, Copper, Wood, Nickel	3M Cubitron	80	8096N106	000000
				4 1/2"	Ceramic Alumina	Stainless Steel, Steel, Aluminum, Copper, Wood, Nickel	3M Cubitron	36	8096N102	000000
				4 1/2"	Ceramic Alumina	Stainless Steel, Steel, Aluminum, Copper, Wood, Nickel	3M Cubitron	60	8096N104	000000
				4 1/2"	Ceramic Alumina	Stainless Steel, Steel, Aluminum, Copper, Wood, Nickel	3M Cubitron	80	8096N105	000000




						For Smooth Finish

						2 3/4"	Ceramic Alumina	Stainless Steel, Steel, Aluminum, Copper, Wood, Nickel	3M Cubitron	120	8096N107	000000


						2 3/4"	Ceramic Alumina	Stainless Steel, Steel, Aluminum, Copper, Wood, Nickel	3M Cubitron	180	8096N109	000000
						2 3/4"	Ceramic Alumina	Stainless Steel, Steel, Aluminum, Copper, Wood, Nickel	3M Cubitron	220	8096N112	000000
						4 1/2"	Ceramic Alumina	Stainless Steel, Steel, Aluminum, Copper, Wood, Nickel	3M Cubitron	120	8096N108	000000
						4 1/2"	Ceramic Alumina	Stainless Steel, Steel, Aluminum, Copper, Wood, Nickel	3M Cubitron	180	8096N111	000000
						4 1/2"	Ceramic Alumina	Stainless Steel, Steel, Aluminum, Copper, Wood, Nickel	3M Cubitron	220	8096N113	000000




								For Extra-Smooth Finish

								2 3/4"	Ceramic Alumina	Stainless Steel, Steel, Aluminum, Copper, Wood, Nickel	3M Cubitron	320	8096N114	000000


								4 1/2"	Ceramic Alumina	Stainless Steel, Steel, Aluminum, Copper, Wood, Nickel	3M Cubitron	320	8096N115	000000

Hook and Loop Vacuum Sanding Sheets for Oscillating Tools


	For Open Blade Mount

Pair these sheets with your oscillating tool to reach into tight spaces. Their hook-and-loop mount lets you quickly attach, remove, and reuse them with a compatible backup pad. Connect your tool to a dust extractor to keep work surfaces clear. A slick coating further prevents debris and heat buildup.

Paper Abrasive Backing—The standard, most economical option. It's good for high-volume sanding where you'll go through a lot of sheets.

Ceramic Alumina Abrasive—The sharp edges cut quickly for efficient material removal.

For Open Blade Mounts—Compatible with any non-Starlock backup pad for non-Starlock oscillating tools.

Grit—The lower the grit number, the rougher the finish. The higher the grit number, the finer the finish.

						3 3/4" x 3 3/4"
	Grit	Abrasive Material	For Use On	Abrasive Backing Material	No. of Vacuum Holes	Pkg. Qty.		Pkg.
For Open Blade Mounts







				For Rough Finish

				80	Ceramic Alumina	Stainless Steel, Steel, Titanium, Wood, Iron, Nickel	Paper	6	10	8964N11	00000




						For Smooth Finish

						120	Ceramic Alumina	Stainless Steel, Steel, Titanium, Wood, Iron, Nickel	Paper	6	10	8964N12	0000


						220	Ceramic Alumina	Stainless Steel, Steel, Titanium, Wood, Iron, Nickel	Paper	6	10	8964N13	0000

Fast-Cutting Adhesive-Back Sanding Rolls

Precision-Shaped Ceramic

Alumina

Trim the length you need, stick it to your sanding tool, and remove material quickly. These rolls have sharp, precision-shaped abrasive that reduces heat to prevent wear. The grains continually fracture to expose fresh cutting edges while keeping their engineered points and angle. When it’s time to change the sheet, just peel it off and attach a new one.

Cloth Abrasive Backing—Flexible and tear resistant, it's good for contoured or rounded surfaces where a rigid backing could crack or rip.

Plastic Film Abrasive Backing—Thin but strong, film resists tearing. It also holds up to water, so it's good for wet sanding.

Ceramic Alumina Abrasive—The sharp edges cut quickly for efficient material removal.

Grit—The lower the grit number, the rougher the finish. The higher the grit number, the finer the finish.

						45 ft. Long
	Wd.	Abrasive Material	For Use On	Mfr. Series	Choose a Grit		Each
Cloth Abrasive Backing







				For Rough Finish

				2 3/4"	Ceramic Alumina	Stainless Steel, Steel, Aluminum, Copper, Wood, Nickel	3M Cubitron	80	8691N17	0000000




						For Smooth Finish

						2 3/4"	Ceramic Alumina	Stainless Steel, Steel, Aluminum, Copper, Wood, Nickel	3M Cubitron	180, 220	8691N211	000000


						Plastic Film Abrasive Backing







										For Rough Finish

										2 3/4"	Ceramic Alumina	Stainless Steel, Steel, Aluminum, Copper, Wood, Nickel	3M Cubitron	80	8691N11	000000




												For Smooth Finish

												2 3/4"	Ceramic Alumina	Stainless Steel, Steel, Aluminum, Copper, Wood, Nickel	3M Cubitron	120, 180, 220	8691N212	00000




														For Extra-Smooth Finish

														2 3/4"	Ceramic Alumina	Stainless Steel, Steel, Aluminum, Copper, Wood, Nickel	3M Cubitron	320, 400	8691N213	00000

Clog-Resistant Sanding Sponges

Image of Product. C. Front orientation. Style C. Clog-Resistant Sanding Sponges.

Prevent debris and heat from building up while sanding curves and complex shapes. A coating or channels keep material from accumulating, so these sponges produce smoother results. They’re flexible to reach into tight spots and offer the comfort and control of a sanding block. Sponges have abrasive on all four sides.

Ceramic Alumina Abrasive—The sharp edges cut quickly for efficient material removal.

Style A—The standard style with a slick coating.

Style B—With thicker layers of abrasive, these sponges remove material quicker than Style C. However, they have fewer channels, so they can't clear away as much dust.

Style C—A good option for surfaces that generate lots of dust, these sponges have more cleaning channels than Style B.

Grit—The lower the grit number, the rougher the finish. The higher the grit number, the finer the finish.

	Lg.	Thk.	Abrasive Material	Abrasive Backing Material	For Use On		Each
Anti-Friction Coated







	For Rough Finish

	A	80	2 1/2"	4 1/2"	1"	Ceramic Alumina	Foam	Steel, Wood	8221A131	00000




			For Smooth Finish

			A	120	2 1/2"	4 1/2"	1"	Ceramic Alumina	Foam	Steel, Wood	8221A141	0000


			Dust Channeling







							For Rough Finish

							B	80	2 1/2"	4 1/2"	1"	Ceramic Alumina	Foam	Steel, Wood	8221A217	0000




									For Smooth Finish

									B	120	2 1/2"	4 1/2"	1"	Ceramic Alumina	Foam	Steel, Wood	8221A218	0000


									B	180	2 1/2"	4 1/2"	1"	Ceramic Alumina	Foam	Steel, Wood	8221A219	0000
									C	220	2 1/2"	4 1/2"	1"	Ceramic Alumina	Foam	Steel, Wood	8221A18	0000

Adhesive-Back Sanding Rolls for Stainless Steel and Hard Metals

With extra-sharp abrasive, these rolls cut through hard metals. Trim off the length you need and stick it to your sanding tool. A slick coating on the abrasive prevents buildup and reduces heat. When it’s time to change the sheet, just peel it off and attach a new one.

Paper Abrasive Backing—The standard, most economical option. It's good for high-volume sanding where you'll go through a lot of sheets.

Ceramic Alumina Abrasive—The sharp edges cut quickly for efficient material removal.

Grit—The lower the grit number, the rougher the finish and the duller the appearance. The higher the grit number, the more polished the finish and the more satin or mirrored the appearance.

	Abrasive Material	Abrasive Backing Material	For Use On	Lg., ft.	Choose a Grit		Each
For Rough Finish



	2 3/4"	Ceramic Alumina	Paper	Stainless Steel, Steel, Titanium, Iron, Nickel	60	80	7224A111	000000


	4 1/2"	Ceramic Alumina	Paper	Stainless Steel, Steel, Titanium, Iron, Nickel	30	80	7224A401	00000


	For Smooth Finish



			2 3/4"	Ceramic Alumina	Paper	Stainless Steel, Steel, Titanium, Iron, Nickel	75	100, 120, 150, 180, 220	7224A12	00000


			4 1/2"	Ceramic Alumina	Paper	Stainless Steel, Steel, Titanium, Iron, Nickel	30	100, 120, 150, 180, 220	7224A501	00000


			For Extra-Smooth Finish



					2 3/4"	Ceramic Alumina	Paper	Stainless Steel, Steel, Titanium, Iron, Nickel	75	240, 320, 400, 500, 600	7224A13	00000


					4 1/2"	Ceramic Alumina	Paper	Stainless Steel, Steel, Titanium, Iron, Nickel	30	240, 320, 400, 500, 600	7224A504	00000


					For Polished Finish



							2 3/4"	Ceramic Alumina	Paper	Stainless Steel, Steel, Titanium, Iron, Nickel	75	800	7224A122	00000


							4 1/2"	Ceramic Alumina	Paper	Stainless Steel, Steel, Titanium, Iron, Nickel	30	800	7224A412	00000

Hook and Loop Vacuum Sanding Rolls for Stainless Steel and Hard Metals

Sand stainless steel, titanium, iron, and other hard metals without the mess. The holes in these rolls work with any style of vacuum sander to clear debris and prevent buildup on the extra-sharp abrasive. Trim rolls to length or tear at perforated lines every 2_3/4" for quick setup. The hook-and-loop mount makes it easy to attach, remove, and reuse each sheet.

Paper Abrasive Backing—The standard, most economical option. It's good for high-volume sanding where you'll go through a lot of sheets.

Ceramic Alumina Abrasive—The sharp edges cut quickly for efficient material removal.

Grit—The lower the grit number, the rougher the finish and the duller the appearance. The higher the grit number, the more polished the finish and the more satin or mirrored the appearance.

	Abrasive Material	Abrasive Backing Material	For Use On	Lg., ft.	For Vacuum Sander Hole Style	Choose a Grit		Each
For Rough Finish



	2 3/4"	Ceramic Alumina	Paper	Stainless Steel, Steel, Titanium, Iron, Nickel	39	Any	80	7224A211	000000


	4 1/2"	Ceramic Alumina	Paper	Stainless Steel, Steel, Titanium, Iron, Nickel	39	Any	60	8077N24	000000


	For Smooth Finish



			2 3/4"	Ceramic Alumina	Paper	Stainless Steel, Steel, Titanium, Iron, Nickel	39	Any	100, 150, 180, 220	7224A22	00000


			4 1/2"	Ceramic Alumina	Paper	Stainless Steel, Steel, Titanium, Iron, Nickel	39	Any	100	8077N23	00000
			4 1/2"	Ceramic Alumina	Paper	Stainless Steel, Steel, Titanium, Iron, Nickel	39	Any	180	8077N22	00000
			4 1/2"	Ceramic Alumina	Paper	Stainless Steel, Steel, Titanium, Iron, Nickel	39	Any	220	8077N21	00000


			For Extra-Smooth Finish



					2 3/4"	Ceramic Alumina	Paper	Stainless Steel, Steel, Titanium, Iron, Nickel	39	Any	320, 400	7224A23	00000


					4 1/2"	Ceramic Alumina	Paper	Stainless Steel, Steel, Titanium, Iron, Nickel	39	Any	240	8077N19	00000
					4 1/2"	Ceramic Alumina	Paper	Stainless Steel, Steel, Titanium, Iron, Nickel	39	Any	320	8077N18	00000


					For Polished Finish



							2 3/4"	Ceramic Alumina	Paper	Stainless Steel, Steel, Titanium, Iron, Nickel	39	Any	500, 600	7224A24	00000