Rigid Rockwool | McMaster-Carr

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Highly Thermally Insulating

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Mineral Wool

Rock Wool/Mineral Fiber/Clay/Filler

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Insulation R Value

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Pipe Size

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Heat Flow Rate @ Temperature

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Yes

Export Control Classification Number (ECCN)

EAR99

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Reinforcement Location

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60 Products

About Selecting Thermal Insulation

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

Rigid Mineral Wool Insulation Sheets


Sheet	Sheets with Wire Mesh	Sheets with Foil Facing

These durable sheets resist compression and are often used in oven and power-generating applications. To use outdoors, add metal jacketing.

Wire Mesh—Sheets with wire-mesh reinforcement withstand extreme shock and vibration.

Sheets with Foil Facing—Sheets with foil facing reflect heat. The foil facing is also known as foil scrim kraft (FSK).

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

	Wd.	Lg., ft.	Insulation R Value	Heat Flow Rate @ Temp.	Color	Flexibility	Performance	Flammability Rating	Max. Temp., ° F	Density, lb/ft³		Each
Insulation Sheets



	1"	24"	4	4.3	0.23 BTU/hr @ 75° F	Green	Semi-Rigid	Flame Resistant	ASTM E84 0/0 for Flame and Smoke	1,200	8	9328K41	000000


	1 1/2"	24"	4	6.5	0.23 BTU/hr @ 75° F	Green	Semi-Rigid	Flame Resistant	ASTM E84 0/0 for Flame and Smoke	1,200	8	9328K42	00000
	2"	24"	4	8.7	0.23 BTU/hr @ 75° F	Green	Semi-Rigid	Flame Resistant	ASTM E84 0/0 for Flame and Smoke	1,200	8	9328K43	00000
	3"	24"	4	12.6	0.24 BTU/hr @ 75° F	Beige	Semi-Rigid	Flame Resistant	ASTM E84 0/0 for Flame and Smoke	1,200	8	9328K44	00000
	4"	24"	4	16.8	0.24 BTU/hr @ 75° F	Beige	Semi-Rigid	Flame Resistant	ASTM E84 0/0 for Flame and Smoke	1,200	8	9328K45	00000


	Sheets with Wire-Mesh Reinforcement on One Side



			1"	24"	4	4.3	0.23 BTU/hr @ 75° F	Green	Semi-Rigid	Flame Resistant	ASTM E84 0/0 for Flame and Smoke	1,200	8	9328K21	00000


			1 1/2"	24"	4	6.5	0.23 BTU/hr @ 75° F	Green	Semi-Rigid	Flame Resistant	ASTM E84 0/0 for Flame and Smoke	1,200	8	9328K22	00000
			2"	24"	4	8.7	0.23 BTU/hr @ 75° F	Green	Semi-Rigid	Flame Resistant	ASTM E84 0/0 for Flame and Smoke	1,200	8	9328K23	00000
			3"	24"	4	12.5	0.24 BTU/hr @ 75° F	Green	Semi-Rigid	Flame Resistant	ASTM E84 0/0 for Flame and Smoke	1,200	8	9328K516	00000
			4"	24"	4	16.5	0.24 BTU/hr @ 75° F	Green	Semi-Rigid	Flame Resistant	ASTM E84 0/0 for Flame and Smoke	1,200	8	9328K518	00000


			Sheets with Wire-Mesh Reinforcement on Two Sides



					1"	24"	4	4.3	0.23 BTU/hr @ 75° F	Green	Semi-Rigid	Flame Resistant	ASTM E84 0/0 for Flame and Smoke	1,200	8	9328K11	00000


					1 1/2"	24"	4	6.5	0.23 BTU/hr @ 75° F	Green	Semi-Rigid	Flame Resistant	ASTM E84 0/0 for Flame and Smoke	1,200	8	9328K12	00000
					2"	24"	4	8.7	0.23 BTU/hr @ 75° F	Green	Semi-Rigid	Flame Resistant	ASTM E84 0/0 for Flame and Smoke	1,200	8	9328K13	00000
					3"	24"	4	12.5	0.24 BTU/hr @ 75° F	Green	Semi-Rigid	Flame Resistant	ASTM E84 0/0 for Flame and Smoke	1,200	8	9328K517	00000
					4"	24"	4	16.5	0.24 BTU/hr @ 75° F	Green	Semi-Rigid	Flame Resistant	ASTM E84 0/0 for Flame and Smoke	1,200	8	9328K519	000000


					Sheets with Foil Facing



							1"	24"	4	4.3	0.24 BTU/hr @ 75° F	Green	Semi-Rigid	Flame Resistant	ASTM E84 0/0 for Flame and Smoke	1,200	8	9328K511	00000


							1 1/2"	24"	4	6.5	0.24 BTU/hr @ 75° F	Green	Semi-Rigid	Flame Resistant	ASTM E84 0/0 for Flame and Smoke	1,200	8	9328K512	00000
							2"	24"	4	8.7	0.24 BTU/hr @ 75° F	Green	Semi-Rigid	Flame Resistant	ASTM E84 0/0 for Flame and Smoke	1,200	8	9328K513	00000
							3"	24"	4	12.5	0.24 BTU/hr @ 75° F	Green	Semi-Rigid	Flame Resistant	ASTM E84 0/0 for Flame and Smoke	1,200	8	9328K514	00000
							4"	24"	4	16.5	0.24 BTU/hr @ 75° F	Green	Semi-Rigid	Flame Resistant	ASTM E84 0/0 for Flame and Smoke	1,200	8	9328K515	00000

Flame-Resistant Mineral Wool Pipe Insulation

Keep flames from spreading along process piping. Made of mineral wool and to ASTM E84 0/0 standards, this insulation won't catch fire or give off smoke. It also maintains its shape and strength at temperatures up to 1200° F without melting or shrinking.

Slit Tubes

Ready to fit over straight pipe sections. Just pull open the insulation, snap it around your pipe, and seal it closed with contact adhesives or insulation tape (not included).

	For Pipe Size	For Copper Tube Size	Lg., ft.	Temp. Range, ° F	Insulation R Value	Heat Flow Rate @ Temp.	Density, lb/ft³	Flexibility	Flammability Rating		Each
1" Thick Wall



	7/8"	1/2	3/4	3 1/4	0 to 1,200	4.3	0.23 BTU/hr @ 75° F	8	Rigid	ASTM E84 0/0 for Flame and Smoke	9364K111	000000


	1"	3/4	—	3 1/4	0 to 1,200	4.3	0.23 BTU/hr @ 75° F	8	Rigid	ASTM E84 0/0 for Flame and Smoke	9364K112	00000
	1 3/8"	1	1 1/4	3 1/4	0 to 1,200	4.3	0.23 BTU/hr @ 75° F	8	Rigid	ASTM E84 0/0 for Flame and Smoke	9364K113	00000
	1 5/8"	1 1/4	1 1/2	3 1/4	0 to 1,200	4.3	0.23 BTU/hr @ 75° F	8	Rigid	ASTM E84 0/0 for Flame and Smoke	9364K114	00000
	1 7/8"	1 1/2	—	3 1/4	0 to 1,200	4.3	0.23 BTU/hr @ 75° F	8	Rigid	ASTM E84 0/0 for Flame and Smoke	9364K115	00000
	2 3/8"	2	—	3 1/4	0 to 1,200	4.3	0.23 BTU/hr @ 75° F	8	Rigid	ASTM E84 0/0 for Flame and Smoke	9364K116	00000
	2 7/8"	2 1/2	—	3 1/4	0 to 1,200	4.3	0.23 BTU/hr @ 75° F	8	Rigid	ASTM E84 0/0 for Flame and Smoke	9364K117	00000
	3 1/2"	3	—	3 1/4	0 to 1,200	4.3	0.23 BTU/hr @ 75° F	8	Rigid	ASTM E84 0/0 for Flame and Smoke	9364K118	00000
	4 1/2"	4	—	3 1/4	0 to 1,200	4.3	0.23 BTU/hr @ 75° F	8	Rigid	ASTM E84 0/0 for Flame and Smoke	9364K119	00000
	5 1/2"	5	—	3 1/4	0 to 1,200	4.3	0.23 BTU/hr @ 75° F	8	Rigid	ASTM E84 0/0 for Flame and Smoke	9364K121	00000
	6 5/8"	6	—	3 1/4	0 to 1,200	4.3	0.23 BTU/hr @ 75° F	8	Rigid	ASTM E84 0/0 for Flame and Smoke	9364K122	00000


	1 1/2" Thick Wall



			7/8"	1/2	3/4	3 1/4	0 to 1,200	6.5	0.23 BTU/hr @ 75° F	8	Rigid	ASTM E84 0/0 for Flame and Smoke	9364K131	00000


			1"	3/4	—	3 1/4	0 to 1,200	6.5	0.23 BTU/hr @ 75° F	8	Rigid	ASTM E84 0/0 for Flame and Smoke	9364K132	00000
			1 3/8"	1	1 1/4	3 1/4	0 to 1,200	6.5	0.23 BTU/hr @ 75° F	8	Rigid	ASTM E84 0/0 for Flame and Smoke	9364K133	00000
			1 5/8"	1 1/4	1 1/2	3 1/4	0 to 1,200	6.5	0.23 BTU/hr @ 75° F	8	Rigid	ASTM E84 0/0 for Flame and Smoke	9364K134	00000
			1 7/8"	1 1/2	—	3 1/4	0 to 1,200	6.5	0.23 BTU/hr @ 75° F	8	Rigid	ASTM E84 0/0 for Flame and Smoke	9364K135	00000
			2 3/8"	2	—	3 1/4	0 to 1,200	6.5	0.23 BTU/hr @ 75° F	8	Rigid	ASTM E84 0/0 for Flame and Smoke	9364K136	00000
			2 7/8"	2 1/2	—	3 1/4	0 to 1,200	6.5	0.23 BTU/hr @ 75° F	8	Rigid	ASTM E84 0/0 for Flame and Smoke	9364K137	00000
			3 1/2"	3	—	3 1/4	0 to 1,200	6.5	0.23 BTU/hr @ 75° F	8	Rigid	ASTM E84 0/0 for Flame and Smoke	9364K138	00000
			4 1/2"	4	—	3 1/4	0 to 1,200	6.5	0.23 BTU/hr @ 75° F	8	Rigid	ASTM E84 0/0 for Flame and Smoke	9364K139	00000
			5 1/2"	5	—	3 1/4	0 to 1,200	6.5	0.23 BTU/hr @ 75° F	8	Rigid	ASTM E84 0/0 for Flame and Smoke	9364K141	00000
			6 5/8"	6	—	3 1/4	0 to 1,200	6.5	0.23 BTU/hr @ 75° F	8	Rigid	ASTM E84 0/0 for Flame and Smoke	9364K142	00000


			8 5/8"	8	—	3 1/4	0 to 1,200	6.5	0.23 BTU/hr @ 75° F	8	Rigid	ASTM E84 0/0 for Flame and Smoke	9364K143	00000


			2" Thick Wall



					7/8"	1/2	3/4	3 1/4	0 to 1,200	8.7	0.23 BTU/hr @ 75° F	8	Rigid	ASTM E84 0/0 for Flame and Smoke	9364K151	00000


					1"	3/4	—	3 1/4	0 to 1,200	8.7	0.23 BTU/hr @ 75° F	8	Rigid	ASTM E84 0/0 for Flame and Smoke	9364K152	00000
					1 3/8"	1	1 1/4	3 1/4	0 to 1,200	8.7	0.23 BTU/hr @ 75° F	8	Rigid	ASTM E84 0/0 for Flame and Smoke	9364K153	00000
					1 5/8"	1 1/4	1 1/2	3 1/4	0 to 1,200	8.7	0.23 BTU/hr @ 75° F	8	Rigid	ASTM E84 0/0 for Flame and Smoke	9364K154	00000
					1 7/8"	1 1/2	—	3 1/4	0 to 1,200	8.7	0.23 BTU/hr @ 75° F	8	Rigid	ASTM E84 0/0 for Flame and Smoke	9364K155	00000
					2 3/8"	2	—	3 1/4	0 to 1,200	8.7	0.23 BTU/hr @ 75° F	8	Rigid	ASTM E84 0/0 for Flame and Smoke	9364K156	00000
					2 7/8"	2 1/2	—	3 1/4	0 to 1,200	8.7	0.23 BTU/hr @ 75° F	8	Rigid	ASTM E84 0/0 for Flame and Smoke	9364K157	00000
					3 1/2"	3	—	3 1/4	0 to 1,200	8.7	0.23 BTU/hr @ 75° F	8	Rigid	ASTM E84 0/0 for Flame and Smoke	9364K158	00000
					4 1/2"	4	—	3 1/4	0 to 1,200	8.7	0.23 BTU/hr @ 75° F	8	Rigid	ASTM E84 0/0 for Flame and Smoke	9364K159	000000
					5 1/2"	5	—	3 1/4	0 to 1,200	8.7	0.23 BTU/hr @ 75° F	8	Rigid	ASTM E84 0/0 for Flame and Smoke	9364K161	000000
					6 5/8"	6	—	3 1/4	0 to 1,200	8.7	0.23 BTU/hr @ 75° F	8	Rigid	ASTM E84 0/0 for Flame and Smoke	9364K162	000000


					8 5/8"	8	—	3 1/4	0 to 1,200	8.7	0.23 BTU/hr @ 75° F	8	Rigid	ASTM E84 0/0 for Flame and Smoke	9364K163	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.

1,380° 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		Each
1/16"	39"	39"	0.1	Rigid	0.81 BTU/hr @ 750° F	59	Off-White	9362K16	000000
1/8"	39"	39"	0.2	Rigid	0.81 BTU/hr @ 750° F	59	Off-White	9362K11	00000
3/16"	39"	39"	0.2	Rigid	0.81 BTU/hr @ 750° F	59	Off-White	9362K12	000000
1/4"	39"	39"	0.3	Rigid	0.81 BTU/hr @ 750° F	59	Off-White	9362K13	000000
3/8"	39"	39"	0.5	Rigid	0.81 BTU/hr @ 750° F	59	Off-White	9362K14	000000