Ceramic Fiber Boards | McMaster-Carr

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Maximum Temperature

Width

Length

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Enclosures and Equipment

Ovens and Furnaces

Heat Flow Rate @ Temperature

0.85 BTU/hr @ 1,000° F

1.2 BTU/hr @ 1,200° F

0.033 BTU/hr @ 1,470° F

0.31 BTU/hr @ 1,470° F

Insulation R Value

Minimum Temperature

RoHS

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

Yes

Export Control Classification Number (ECCN)

EAR99

DFARS Specialty Metals

Exempt

REACH

Compliant

Not Compliant

Flammability Rating

ASTM E84 0/0 for Flame and Smoke

UL 723 0/0 for Flame and Smoke

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89 Products

About Selecting Thermal Insulation

Compare R-value and temperature range to find the insulation material that best suits your application.

Abrasion-Resistant Rigid Calcium Silicate Insulation Sheets

Made of high-strength calcium silicate, these durable sheets withstand high temperatures and are often used in power-generating applications.

14.5 lb/ft³ Density

Image of Product. Front orientation. Insulation Sheets. Abrasion-Resistant Rigid Calcium Silicate Insulation Sheets.

Flame Resistant—Flame-resistant sheets meet ASTM E84 0/0 for flame and smoke.

	Lg., ft.	Insulation R Value	Flexibility	Performance	Max. Temp., ° F	Heat Flow Rate @ Temp.	Color	Flammability Rating	Pkg. Qty.		Pkg.
1 1/2" Thick



	6"	3	2.1	Rigid	Abrasion Resistant, Flame Resistant	1,200	0.73 BTU/hr @ 800° F	Gold	ASTM E84 0/0 for Flame and Smoke	2	9391K51	000000


	12"	3	2.1	Rigid	Abrasion Resistant, Flame Resistant	1,200	0.73 BTU/hr @ 800° F	Gold	ASTM E84 0/0 for Flame and Smoke	2	9391K52	00000


	2" Thick



			6"	3	2.7	Rigid	Abrasion Resistant, Flame Resistant	1,200	0.73 BTU/hr @ 800° F	Gold	ASTM E84 0/0 for Flame and Smoke	2	9391K61	00000


			12"	3	2.7	Rigid	Abrasion Resistant, Flame Resistant	1,200	0.73 BTU/hr @ 800° F	Gold	ASTM E84 0/0 for Flame and Smoke	2	9391K62	000000
			18"	3	2.7	Rigid	Abrasion Resistant, Flame Resistant	1,200	0.73 BTU/hr @ 800° F	Gold	ASTM E84 0/0 for Flame and Smoke	2	9391K63	000000

40 lb/ft³ Density

Sheets with a density of 40 lb/ft³ can be machined.

Flame Resistant—Flame-resistant sheets meet ASTM E84 0/0 for flame and smoke.

	Lg., ft.	Insulation R Value	Flexibility	Performance	Max. Temp., ° F	Heat Flow Rate @ Temp.	Color	Flammability Rating		Each
1/2" Thick



	12"	1	0.6	Rigid	Abrasion Resistant, Flame Resistant	1,700	0.8 BTU/hr @ 800° F	White	ASTM E84 0/0 for Flame and Smoke	9353K31	000000


	24"	4	0.6	Rigid	Abrasion Resistant, Flame Resistant	1,700	0.8 BTU/hr @ 800° F	White	ASTM E84 0/0 for Flame and Smoke	9353K41	000000
	48"	4	0.6	Rigid	Abrasion Resistant, Flame Resistant	1,700	0.8 BTU/hr @ 800° F	White	ASTM E84 0/0 for Flame and Smoke	9353K61	000000


	3/4" Thick



			12"	1	0.9	Rigid	Abrasion Resistant, Flame Resistant	1,700	0.8 BTU/hr @ 800° F	White	ASTM E84 0/0 for Flame and Smoke	9353K32	00000


			24"	4	0.9	Rigid	Abrasion Resistant, Flame Resistant	1,700	0.8 BTU/hr @ 800° F	White	ASTM E84 0/0 for Flame and Smoke	9353K42	000000
			48"	4	0.9	Rigid	Abrasion Resistant, Flame Resistant	1,700	0.8 BTU/hr @ 800° F	White	ASTM E84 0/0 for Flame and Smoke	9353K62	000000


			1" Thick



					12"	1	1.3	Rigid	Abrasion Resistant, Flame Resistant	1,700	0.8 BTU/hr @ 800° F	White	ASTM E84 0/0 for Flame and Smoke	9353K33	00000


					24"	4	1.3	Rigid	Abrasion Resistant, Flame Resistant	1,700	0.8 BTU/hr @ 800° F	White	ASTM E84 0/0 for Flame and Smoke	9353K43	000000
					48"	4	1.3	Rigid	Abrasion Resistant, Flame Resistant	1,700	0.8 BTU/hr @ 800° F	White	ASTM E84 0/0 for Flame and Smoke	9353K63	000000

55 lb/ft³ Density

Sheets with a density of 55 lb/ft³ stand up to heavy compression.

	Lg., ft.	Insulation R Value	Flexibility	Performance	Max. Temp., ° F	Heat Flow Rate @ Temp.	Color		Each
1/2" Thick



	12"	1	0.5	Rigid	Abrasion Resistant	1,700	1.05 BTU/hr @ 800° F	White	93505K12	000000


	24"	4	0.5	Rigid	Abrasion Resistant	1,700	1.05 BTU/hr @ 800° F	White	93505K22	000000
	48"	4	0.5	Rigid	Abrasion Resistant	1,700	1.05 BTU/hr @ 800° F	White	93505K32	000000


	1" Thick



			12"	1	1	Rigid	Abrasion Resistant	1,700	1.05 BTU/hr @ 800° F	White	93505K14	00000


			24"	4	1	Rigid	Abrasion Resistant	1,700	1.05 BTU/hr @ 800° F	White	93505K24	000000
			48"	4	1	Rigid	Abrasion Resistant	1,700	1.05 BTU/hr @ 800° F	White	93505K34	00000000


			1 1/2" Thick



					12"	1	1.4	Rigid	Abrasion Resistant	1,700	1.05 BTU/hr @ 800° F	White	93505K16	000000


					24"	4	1.4	Rigid	Abrasion Resistant	1,700	1.05 BTU/hr @ 800° F	White	93505K26	000000
					48"	4	1.4	Rigid	Abrasion Resistant	1,700	1.05 BTU/hr @ 800° F	White	93505K36	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

Rigid Silica High-Efficiency Insulation Sheets for Furnaces

Typically used in ovens and furnaces, these are the most efficient of our rigid high-temperature insulation sheets. Please note that they require special care when installing since the crumbly material is difficult to work with and will crack easily. Sheets lose strength over time and are intended to be installed behind another facing or insulation material. They resist damage from fire and moisture. Insulation performs best at temperatures above 1,000° F.

Thk.	Wd.	Lg.	Max. Temp., ° F	Insulation R Value	Heat Flow Rate @ Temp.	Density, lb/ft³	Color	Flexibility		Each
3/16"	19 1/2"	23 1/2"	1,740	1.2	0.31 BTU/hr @ 1,470° F	16	White	Rigid	6841K11	000000
1/4"	19 1/2"	23 1/2"	1,740	1.2	0.31 BTU/hr @ 1,470° F	16	White	Rigid	6841K21	00000
3/8"	25 1/2"	39"	1,832	Not Rated	0.033 BTU/hr @ 1,470° F	17	Gray	Rigid	6841K33	000000
3/4"	25 1/2"	39"	1,832	Not Rated	0.033 BTU/hr @ 1,470° F	17	Gray	Rigid	6841K43	000000
1"	25 1/2"	39"	1,832	Not Rated	0.033 BTU/hr @ 1,470° F	17	Gray	Rigid	6841K53	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

Acid-Resistant Silica Insulation Sheets for Furnaces

Commonly used in furnaces and engine compartments, these flexible silica fiber sheets resist corrosive acids. They perform best at temperatures above 1,000° F.

10 lb/ft³ Density

Image of Product. Front orientation. Insulation Sheets. Acid-Resistant Silica Insulation Sheets for Furnaces.

	Insulation R Value	Flexibility	Temp. Range, ° F	Heat Flow Rate @ Temp.	Color	Performance	Choose a Length, ft.		Per Ft.
1/4" Thick



	36"	0.3	Flexible	0 to 2,000	0.78 BTU/hr @ 800° F	White	Acid Resistant	2 , 10 , 25	93435K41	000000


	1/2" Thick



			36"	0.6	Flexible	0 to 2,000	0.78 BTU/hr @ 800° F	White	Acid Resistant	2 , 10 , 25	93435K43	00000


			1" Thick



					36"	1.3	Flexible	0 to 2,000	0.78 BTU/hr @ 800° F	White	Acid Resistant	2 , 10 , 25	93435K45	00000

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-Thin Rigid Millboard Insulation Sheets for Furnaces

Thinner than most rigid insulation for furnaces and other high-heat applications, these millboard sheets are also used for gasket fabrication. Insulation performs best at temperatures above 1,000° F.

2,000° F Maximum Temperature

Image of Product. Front orientation. Insulation Sheets. Ultra-Thin Rigid Millboard Insulation Sheets for Furnaces.

Thk.	Wd.	Lg.	Insulation R Value	Flexibility	Heat Flow Rate @ Temp.	Density, lb/ft³	Color
1/16"	55"	55"	0.1	Rigid	0.73 BTU/hr @ 800° F	37.5	White	9390K11
1/8"	55"	55"	0.2	Rigid	0.73 BTU/hr @ 800° F	37.5	White	9390K12
3/16"	55"	55"	0.3	Rigid	0.73 BTU/hr @ 800° F	37.5	White	9390K13
1/4"	55"	55"	0.3	Rigid	0.73 BTU/hr @ 800° F	37.5	White	9390K14