Alumina Silicate | McMaster-Carr

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Yes

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Ultra High Temperature

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Heat Flow Rate @ Temperature

0.85 BTU/hr @ 1,000° F

1.2 BTU/hr @ 1,200° F

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Flammability Rating

ASTM E84 0/0 for Flame and Smoke

UL 723 0/0 for Flame and Smoke

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119 Products

About Composites

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

Low Thermal Expansion Alumina Silicate Ceramic Sheets and Bars

Also known as lava and wonderstone, this material is often used in applications that require high temperature resistance and low thermal expansion, such as standoffs and welding jigs.

Sheets

			Temp., ° F							4" × 4"		6" × 6"		9 1/2" × 9 1/2"
Thk.	Thk. Tolerance	Color	Min.	Max.	Fabrication	Dielectric Strength, V/mil	Porosity	Compressive Strength, psi	Hardness		Each		Each		Each



	1/8"	-0.010" to 0.010"	Gray	72	2,010	Unfired	100	2%	25,000	Rockwell H59	8479K11	000000	8479K12	000000	8479K115	0000000


	1/4"	-0.010" to 0.010"	Gray	72	2,010	Unfired	100	2%	25,000	Rockwell H59	8479K41	00000	8479K42	000000	8479K116	000000
	3/8"	-0.010" to 0.010"	Gray	72	2,010	Unfired	100	2%	25,000	Rockwell H59	8479K22	00000	8479K98	000000	8479K117	000000
	1/2"	-0.010" to 0.010"	Gray	72	2,010	Unfired	100	2%	25,000	Rockwell H59	8479K14	00000	8479K99	000000	8479K58	000000
	3/4"	-0.010" to 0.010"	Gray	72	2,010	Unfired	100	2%	25,000	Rockwell H59	8479K16	000000	8479K111	000000	8479K59	000000
	1"	-0.010" to 0.010"	Gray	72	2,010	Unfired	100	2%	25,000	Rockwell H59	8479K18	000000	8479K112	000000	8479K62	000000
	1 1/2"	-0.010" to 0.010"	Gray	72	2,010	Unfired	100	2%	25,000	Rockwell H59	8479K96	000000	8479K113	000000	8479K64	000000
	2"	-0.010" to 0.010"	Gray	72	2,010	Unfired	100	2%	25,000	Rockwell H59	8479K97	000000	8479K114	000000	8479K66	000000

Bars

			Temp., ° F							1/2" × 6"		3/4" × 6"		1" × 6"		2" × 6"
Thk.	Thk. Tolerance	Color	Min.	Max.	Fabrication	Dielectric Strength, V/mil	Porosity	Compressive Strength, psi	Hardness		Each		Each		Each		Each



	1/2"	0.000" to 0.020"	Gray	72	2,010	Unfired	100	2%	25,000	Rockwell H59	8479K61	000000	———	0	———	0	———	0


	3/4"	0.000" to 0.020"	Gray	72	2,010	Unfired	100	2%	25,000	Rockwell H59	———	0	8479K86	000000	———	0	———	0
	1"	0.000" to 0.020"	Gray	72	2,010	Unfired	100	2%	25,000	Rockwell H59	———	0	———	0	8479K88	000000	———	0
	2"	0.000" to 0.020"	Gray	72	2,010	Unfired	100	2%	25,000	Rockwell H59	———	0	———	0	———	0	8479K95	0000000

Low Thermal Expansion Alumina Silicate Ceramic Rods

Also known as lava and wonderstone, this material is often used in applications that require high temperature resistance and low thermal expansion, such as standoffs and welding jigs.

			Temp., ° F							3" Lg.		6" Lg.		9 1/2" Lg.
Dia.	Dia. Tolerance	Color	Min.	Max.	Fabrication	Dielectric Strength, V/mil	Porosity	Compressive Strength, psi	Hardness		Each		Each		Each



	1/8"	0.000" to 0.015"	Gray	72	2,010	Unfired	100	2%	25,000	Rockwell H59	8479K91	000000	———	0	———	0


	1/4"	0.000" to 0.015"	Gray	72	2,010	Unfired	100	2%	25,000	Rockwell H59	8479K21	00000	———	0	———	0
	3/8"	0.000" to 0.015"	Gray	72	2,010	Unfired	100	2%	25,000	Rockwell H59	———	0	8479K92	000000	———	0
	1/2"	0.000" to 0.015"	Gray	72	2,010	Unfired	100	2%	25,000	Rockwell H59	———	0	8479K72	00000	———	0
	5/8"	0.000" to 0.015"	Gray	72	2,010	Unfired	100	2%	25,000	Rockwell H59	———	0	8479K68	00000	———	0
	3/4"	0.000" to 0.015"	Gray	72	2,010	Unfired	100	2%	25,000	Rockwell H59	———	0	———	0	8479K69	000000
	7/8"	0.000" to 0.015"	Gray	72	2,010	Unfired	100	2%	25,000	Rockwell H59	———	0	———	0	8479K71	00000
	1"	0.000" to 0.015"	Gray	72	2,010	Unfired	100	2%	25,000	Rockwell H59	———	0	———	0	8479K73	000000
	1 1/4"	0.000" to 0.015"	Gray	72	2,010	Unfired	100	2%	25,000	Rockwell H59	———	0	———	0	8479K74	000000
	1 1/2"	0.000" to 0.015"	Gray	72	2,010	Unfired	100	2%	25,000	Rockwell H59	———	0	———	0	8479K75	000000
	2"	0.000" to 0.015"	Gray	72	2,010	Unfired	100	2%	25,000	Rockwell H59	———	0	———	0	8479K76	000000


	2 1/2"	0.000" to 0.015"	Gray	72	2,010	Unfired	100	2%	25,000	Rockwell H59	———	0	———	0	8479K77	000000
	3"	0.000" to 0.015"	Gray	72	2,010	Unfired	100	2%	25,000	Rockwell H59	———	0	———	0	8479K78	000000
	3 1/2"	0.000" to 0.015"	Gray	72	2,010	Unfired	100	2%	25,000	Rockwell H59	———	0	———	0	8479K79	000000
	4"	0.000" to 0.015"	Gray	72	2,010	Unfired	100	2%	25,000	Rockwell H59	———	0	———	0	8479K118	00000000
	5"	0.000" to 0.015"	Gray	72	2,010	Unfired	100	2%	25,000	Rockwell H59	———	0	———	0	8479K84	00000000

Ceramic Fiber Insulation Sheets for Furnaces

The most common of our flexible high-temperature sheets, these are used to insulate furnaces. They also can be fabricated into gaskets. Insulation performs best at temperatures above 1,000° F.

Without Binder—Sheets without binder don’t have a binder that can burn when installed, so they won’t produce a strong odor. They’re often used to vacuum heat treat furnaces. However, they’re weaker and more brittle than sheets with a binder.

With Binder—Sheets with binder are stronger in structure, easier to cut, and more pliable than those without a binder. The binder will burn out at 350° and release gas with a strong odor, so only use them in applications where burnout is not an issue.

			Temperature, ° F
	Wd.	Lg., ft.	Min.	Max.	Insulation R Value	Heat Flow Rate @ Temp.	Density, lb/ft³	Flexibility	Color	Flammability Rating		Each
Without Binder







				1/16" Thick

				6"	100	Not Rated	2,300	0.1	0.43 BTU/hr @ 800° F	9	Flexible	White	—	93285K31	0000000


				12"	50	Not Rated	2,300	0.1	0.43 BTU/hr @ 800° F	9	Flexible	White	—	93285K32	000000
				24"	25	Not Rated	2,300	0.1	0.43 BTU/hr @ 800° F	9	Flexible	White	—	93285K33	000000




						1/8" Thick

						12"	50	Not Rated	2,300	0.1	0.43 BTU/hr @ 800° F	9	Flexible	White	—	93285K34	000000


						24"	25	Not Rated	2,300	0.1	0.43 BTU/hr @ 800° F	9	Flexible	White	—	93285K35	000000




								1/4" Thick

								24"	20	Not Rated	2,150	0.3	0.75 BTU/hr @ 800° F	6	Flexible	White	UL 723 0/0 for Flame and Smoke	93315K51	00000


								24"	20	Not Rated	2,150	0.4	0.65 BTU/hr @ 800° F	8	Flexible	White	UL 723 0/0 for Flame and Smoke	93315K71	00000
								48"	20	-455	2,150	0.3	0.78 BTU/hr @ 800° F	6	Flexible	White	UL 723 0/0 for Flame and Smoke	93315K113	000000
								48"	20	-455	2,150	0.4	0.7 BTU/hr @ 800° F	8	Flexible	White	UL 723 0/0 for Flame and Smoke	93315K118	000000




										1/2" Thick

										24"	50	Not Rated	2,150	0.7	0.75 BTU/hr @ 800° F	6	Flexible	White	UL 723 0/0 for Flame and Smoke	93315K82	000000


										24"	50	Not Rated	2,150	0.8	0.65 BTU/hr @ 800° F	8	Flexible	White	UL 723 0/0 for Flame and Smoke	93315K92	000000
										48"	50	-455	2,150	0.5	0.96 BTU/hr @ 800° F	4	Flexible	White	UL 723 0/0 for Flame and Smoke	93315K109	000000
										48"	50	-455	2,150	0.6	0.78 BTU/hr @ 800° F	6	Flexible	White	UL 723 0/0 for Flame and Smoke	93315K114	000000
										48"	50	-455	2,150	0.7	0.7 BTU/hr @ 800° F	8	Flexible	White	UL 723 0/0 for Flame and Smoke	93315K119	000000




												1" Thick

												24"	25	-455	2,400	1.3	0.78 BTU/hr @ 800° F	6	Flexible	White	UL 723 0/0 for Flame and Smoke	93315K101	000000


												24"	25	-455	2,400	1.4	0.7 BTU/hr @ 800° F	8	Flexible	White	UL 723 0/0 for Flame and Smoke	93315K104	000000
												24"	25	Not Rated	2,150	1	1 BTU/hr @ 800° F	4	Flexible	White	UL 723 0/0 for Flame and Smoke	93315K34	00000
												24"	25	Not Rated	2,150	1.3	0.75 BTU/hr @ 800° F	6	Flexible	White	UL 723 0/0 for Flame and Smoke	93315K54	000000
												24"	25	Not Rated	2,150	1.5	0.65 BTU/hr @ 800° F	8	Flexible	White	UL 723 0/0 for Flame and Smoke	93315K74	000000
												48"	25	-455	2,150	1	0.96 BTU/hr @ 800° F	4	Flexible	White	UL 723 0/0 for Flame and Smoke	93315K111	000000
												48"	25	-455	2,150	1.3	0.78 BTU/hr @ 800° F	6	Flexible	White	UL 723 0/0 for Flame and Smoke	93315K115	000000
48"												25	-455	2,150	1.4	0.7 BTU/hr @ 800° F	8	Flexible	White	UL 723 0/0 for Flame and Smoke	93315K121	000000
48"	25											-455	2,400	1.4	0.7 BTU/hr @ 800° F	8	Flexible	White	UL 723 0/0 for Flame and Smoke	93315K105	000000




		1 1/2" Thick

		24"	15									-455	2,400	2.1	0.7 BTU/hr @ 800° F	8	Flexible	White	UL 723 0/0 for Flame and Smoke	93315K106	000000


		24"	15									Not Rated	2,150	1.5	1 BTU/hr @ 800° F	4	Flexible	White	UL 723 0/0 for Flame and Smoke	93315K16	00000
		24"	15									Not Rated	2,150	2	0.75 BTU/hr @ 800° F	6	Flexible	White	UL 723 0/0 for Flame and Smoke	93315K86	000000
		24"	15									Not Rated	2,150	2.3	0.65 BTU/hr @ 800° F	8	Flexible	White	UL 723 0/0 for Flame and Smoke	93315K96	000000
		48"	15									-455	2,150	1.9	0.78 BTU/hr @ 800° F	6	Flexible	White	UL 723 0/0 for Flame and Smoke	93315K116	000000
		48"	15									-455	2,150	2.1	0.7 BTU/hr @ 800° F	8	Flexible	White	UL 723 0/0 for Flame and Smoke	93315K122	000000




				2" Thick

				24"	12 1/2							-455	2,400	2.9	0.7 BTU/hr @ 800° F	8	Flexible	White	UL 723 0/0 for Flame and Smoke	93315K107	000000


				24"	12 1/2							Not Rated	2,150	2	1 BTU/hr @ 800° F	4	Flexible	White	UL 723 0/0 for Flame and Smoke	93315K18	00000
				24"	12 1/2							Not Rated	2,150	2.7	0.75 BTU/hr @ 800° F	6	Flexible	White	UL 723 0/0 for Flame and Smoke	93315K88	000000
				24"	12 1/2							Not Rated	2,150	3.1	0.65 BTU/hr @ 800° F	8	Flexible	White	UL 723 0/0 for Flame and Smoke	93315K98	000000
				48"	12 1/2	-455						2,150	2.6	0.78 BTU/hr @ 800° F	6	Flexible	White	UL 723 0/0 for Flame and Smoke	93315K117	000000
				48"	12 1/2	-455	2,150					2.9	0.7 BTU/hr @ 800° F	8	Flexible	White	UL 723 0/0 for Flame and Smoke	93315K123	000000
				48"	12 1/2	-455	2,400					2.9	0.7 BTU/hr @ 800° F	8	Flexible	White	UL 723 0/0 for Flame and Smoke	93315K108	000000


				With Binder







								1/16" Thick

								6"	100			-425	2,300	0.1	0.71 BTU/hr @ 800° F	7.5	Flexible	White	—	93285K22	000000


								12"	50			-425	2,300	0.1	0.71 BTU/hr @ 800° F	7.5	Flexible	White	—	93285K24	000000
								24"	25			-425	2,300	0.1	0.71 BTU/hr @ 800° F	7.5	Flexible	White	—	93285K26	000000




												1/8" Thick

												6"	20	-425	2,300	0.2	0.71 BTU/hr @ 800° F	7.5	Flexible	White	—	93285K12	00000


										6"	100	-425	2,300	0.2	0.71 BTU/hr @ 800° F	7.5	Flexible	White	—	93285K42	000000
										12"	10	-425	2,300	0.2	0.71 BTU/hr @ 800° F	7.5	Flexible	White	—	93285K15	00000
										12"	50	-425	2,300	0.2	0.71 BTU/hr @ 800° F	7.5	Flexible	White	—	93285K44	000000
										24"	5	-425	2,300	0.2	0.71 BTU/hr @ 800° F	7.5	Flexible	White	—	93285K18	00000
										24"	25	-425	2,300	0.2	0.71 BTU/hr @ 800° F	7.5	Flexible	White	—	93285K46	000000




												1/4" Thick

6"												100	-425	2,300	0.4	0.57 BTU/hr @ 800° F	7.5	Flexible	White	—	93285K62	000000


12"	50											-425	2,300	0.4	0.57 BTU/hr @ 800° F	7.5	Flexible	White	—	93285K64	000000
24"	25											-425	2,300	0.4	0.57 BTU/hr @ 800° F	7.5	Flexible	White	—	93285K66	000000

Moldable Ceramic Insulation Sheets for Furnaces

Wet these rigid sheets and they become formable. They can be molded multiple times until exposed to heat, which causes them to become rigid again. Insulation performs best at temperatures above 1,000° F.

75 lb/ft³ Density

Image of Product. Front orientation. Insulation Sheets. Moldable Ceramic Insulation Sheets for Furnaces.

	Lg., ft.	Insulation R Value	Flexibility	Temp. Range, ° F	Heat Flow Rate @ Temp.	Color		Each
1/32" Thick



	23"	2	0.1	Rigid	-120 to 2,730	1.2 BTU/hr @ 1,200° F	White	93615K11	0000000


	1/16" Thick



			23"	2	0.1	Rigid	-120 to 2,730	1.2 BTU/hr @ 1,200° F	White	93615K14	000000


			1/8" Thick



					23"	2	0.1	Rigid	-120 to 2,730	1.2 BTU/hr @ 1,200° F	White	93615K16	000000


					1/4" Thick



							23"	2	0.2	Rigid	-120 to 2,730	1.2 BTU/hr @ 1,200° F	White	93615K18	000000

Ultra-High-Temperature Ceramic Fiber Pipe Insulation Strips

Calcium Aluminum Silicate

Ceramic Fiber

Withstands the highest temperatures of all our pipe insulation. Made of ceramic fiber, this insulation won't melt, sag, or degrade in extreme heat. It's often used in ovens, furnaces, steel mills, and other demanding environments.

Calcium Aluminum Silicate Ceramic Fiber—Strong and durable, this insulation stays in place for many years without degrading.

Adhesive Backing—Install insulation without having to hold it in place—simply position and secure it using band clamps or other components of the assembly. Apply while cool. Heat above 400° F starts to weaken the adhesive, but the insulation's temperature rating remains unaffected.

							Adhesive Backing
	Wd.	Max. Temp., ° F	Insulation R Value	Heat Flow Rate @ Temp.	Density, lb/ft³	Flexibility	Lg., ft.		Each
Calcium Aluminum Silicate Ceramic Fiber







				1/32" Thick

				1"	1,500	0.04	0.82 BTU/hr @ 800° F	35	Flexible	25	4057K1	000000


				1 1/2"	1,500	0.04	0.82 BTU/hr @ 800° F	35	Flexible	25	4057K21	00000
				2"	1,500	0.04	0.82 BTU/hr @ 800° F	35	Flexible	25	4057K4	00000
				2 1/2"	1,500	0.04	0.82 BTU/hr @ 800° F	35	Flexible	25	4057K22	00000
				3"	1,500	0.04	0.82 BTU/hr @ 800° F	35	Flexible	25	4057K7	00000




						1/16" Thick

						1"	1,500	0.08	0.82 BTU/hr @ 800° F	35	Flexible	25	4057K2	00000


						1 1/2"	1,500	0.08	0.82 BTU/hr @ 800° F	35	Flexible	25	4057K23	00000
						2"	1,500	0.08	0.82 BTU/hr @ 800° F	35	Flexible	25	4057K5	00000
						2 1/2"	1,500	0.08	0.82 BTU/hr @ 800° F	35	Flexible	25	4057K24	00000
						3"	1,500	0.08	0.82 BTU/hr @ 800° F	35	Flexible	25	4057K8	00000




								1/8" Thick

								1"	1,500	0.2	0.82 BTU/hr @ 800° F	35	Flexible	25	4057K3	00000


								2"	1,500	0.2	0.82 BTU/hr @ 800° F	35	Flexible	25	4057K6	00000
								3"	1,500	0.2	0.82 BTU/hr @ 800° F	35	Flexible	25	4057K9	000000




										1/4" Thick

										1"	1,500	0.3	0.82 BTU/hr @ 800° F	35	Flexible	25	4057K14	000000


										2"	1,500	0.3	0.82 BTU/hr @ 800° F	35	Flexible	25	4057K15	000000
										3"	1,500	0.3	0.82 BTU/hr @ 800° F	35	Flexible	25	4057K16	000000

Shock-Resistant Ceramic Fiber Insulation Sheets for Furnaces

Designed for fluctuating, high-temperature applications, these semi-rigid sheets are typically used in furnaces and fire protection applications. They experience very little shrinkage at high temperatures, but the brittle material can be somewhat difficult to work with. Insulation is flame resistant, meeting ASTM E84 0/0 for flame and smoke. It performs best at temperatures above 1,000° F.

18 lb/ft³ Density

Image of Product. Front orientation. Insulation Sheets. Shock-Resistant Ceramic Fiber Insulation Sheets for Furnaces.

With Binder—Sheet with binder is easier to handle at room temperature than sheet without a binder, but it contains a small amount of organic material that burns off and releases smoke at around 400° F.

Without Binder—Sheet without binder won't produce smoke when heated.

										With Binder		Without Binder
	Wd.	Lg., ft.	Insulation R Value	Flexibility	Temp. Range, ° F	Heat Flow Rate @ Temp.	Color	Performance	Flammability Rating		Each		Each
1" Thick



		24"	3	1.2	Rigid	0 to 2,300	0.85 BTU/hr @ 1,000° F	Off-White	Flame Resistant, Shock Resistant	ASTM E84 0/0 for Flame and Smoke	93595K73	000000	93595K75	000000

Sanding Tube Brushes

Flexible Bristles

Abrasive grains are embedded in the entire length of the bristles to remove workpiece material as well as surface contamination in a single step. The nylon bristles won't leave behind debris that could cause rust on your workpiece and are recommended for use around acids and alkalies.

Flexible Bristles—Flexible bristles are used to remove light-to-medium rust and stains and small burs.

		Brush		Bristle		Stem						Each
	Shank Dia.	Dia.	Lg.	Dia.	No. of Spirals	No. of Wires	Wire Material	Overall Lg.	Abrasive Material	Grit		1-11	12-Up
Twisted Shank







				Flexible Nylon Bristles—For Use On Steel, Stainless Steel, Titanium, Brass, Bronze, Copper, Plastic

				0.016"	0.035"	5/8"	0.008"	1	2	Stainless Steel	3"	Alumina Silicate Ceramic	1000 Grit (For Polished Finish)	4754A11	000000	00000


				0.016"	1 mm	5/8"	0.008"	1	2	Stainless Steel	3"	Alumina Silicate Ceramic	1000 Grit (For Polished Finish)	4905A64	00000	00000
				0.026"	0.052"	3/4"	0.008"	1	2	Stainless Steel	3"	Alumina Silicate Ceramic	1000 Grit (For Polished Finish)	4754A23	00000	0000
				0.026"	0.054"	3/4"	0.008"	1	2	Stainless Steel	3"	Alumina Silicate Ceramic	1000 Grit (For Polished Finish)	4754A12	00000	0000
				0.026"	1.5 mm	5/8"	0.008"	1	2	Stainless Steel	3"	Alumina Silicate Ceramic	1000 Grit (For Polished Finish)	4905A65	00000	00000