Alumina Silicate Bars | McMaster-Carr

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Thermal Conductivity @ Temperature

1.265 W/(m⋅°C) @ 20° C

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Unfired

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Greater than 0° F

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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