Mineral Gasket Sheets | McMaster-Carr

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Material

Mica

Shape

Film

Sheet

System of Measurement

Thickness

Maximum Temperature

Width

Performance

Electrically Insulating

Length

Color

Clarity

Dielectric Strength

Flammability Rating

Minimum Temperature

DFARS Specialty Metals

Exempt

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

Export Control Classification Number (ECCN)

Density

2.6 g/cm³ to 3.2 g/cm³

Maximum Continuous Temperature

930° F

1,275° F

1,800° F

Maximum Intermittent Temperature

Thermal Conductivity

Tensile Strength

10,000 psi to 19,999 psi

20,000 psi to 29,999 psi

Not Rated

Thermal Conductivity @ Temperature

2.08 BTU⋅in/(hr⋅ft²⋅°F) @ 68° F

3.72 BTU⋅in/(hr⋅ft²⋅°F) @ 73° F

2.08 BTU⋅in/(hr⋅ft²⋅°F) @ 500° F

Not Rated

REACH

Not Compliant

RoHS

Compliant

Certificate Type

Material Certificate with Traceable Lot Number

Flexibility

126 Products

Flexible Extra-High-Temperature Electrically Insulating Mica Sheets

A silicone resin binder gives these sheets enough flexibility to be used as wrap-around electrical or thermal insulation. They're often used on electric vehicle batteries as liners and sleeving, or as gaskets in spots where plastics would melt from extreme heat. These sheets can withstand temperatures up to 1800° F for a few minutes, but if they stay above 1275° F for too long, they may turn to carbon and stop insulating. They meet UL 94 V-0 for flame retardance. Also known as phlogopite mica. Cut these sheets with scissors, die stamps, or punches.

	Thk. Tolerance	Dielectric Strength, V/mil	Max. Continuous Temp., ° F	Max. Intermittent Temp., ° F		Each
23" × 39"



	0.004"	-0.0016" to 0.0016"	508	1,275	1,800	85955K21	000000


	0.006"	-0.0016" to 0.0016"	508	1,275	1,800	85955K111	00000
	0.008"	-0.0016" to 0.0016"	508	1,275	1,800	85955K22	00000
	0.010"	-0.0016" to 0.0016"	508	1,275	1,800	85955K112	00000
	0.012"	-0.0016" to 0.0016"	508	1,275	1,800	85955K23	00000
	0.016"	-0.0016" to 0.0016"	508	1,275	1,800	85955K24	00000
	0.020"	-0.0024" to 0.0024"	508	1,275	1,800	85955K25	00000
	0.024"	-0.0024" to 0.0024"	508	1,275	1,800	85955K26	00000
	0.028"	-0.0030" to 0.0030"	508	1,275	1,800	85955K126	00000
	0.032"	-0.0028" to 0.0028"	508	1,275	1,800	85955K114	00000
	0.036"	-0.0030" to 0.0030"	508	1,275	1,800	85955K129	00000


	0.040"	-0.0032" to 0.0032"	508	1,275	1,800	85955K115	00000
	0.060"	-0.0030" to 0.0030"	508	1,275	1,800	85955K133	000000


	39" × 47"



			0.004"	-0.0030" to 0.0030"	508	1,275	1,800	85955K117	00000


			0.006"	-0.0030" to 0.0030"	508	1,275	1,800	85955K118	00000
			0.008"	-0.0030" to 0.0030"	508	1,275	1,800	85955K119	00000
			0.010"	-0.0030" to 0.0030"	508	1,275	1,800	85955K121	00000
			0.012"	-0.0030" to 0.0030"	508	1,275	1,800	85955K122	00000
			0.016"	-0.0030" to 0.0030"	508	1,275	1,800	85955K123	00000
			0.020"	-0.0030" to 0.0030"	508	1,275	1,800	85955K124	00000
			0.024"	-0.0030" to 0.0030"	508	1,275	1,800	85955K125	00000
			0.028"	-0.0030" to 0.0030"	508	1,275	1,800	85955K127	000000
			0.032"	-0.0030" to 0.0030"	508	1,275	1,800	85955K128	000000
			0.036"	-0.0030" to 0.0030"	508	1,275	1,800	85955K131	000000


			0.040"	-0.0030" to 0.0030"	508	1,275	1,800	85955K132	000000
			0.060"	-0.0030" to 0.0030"	508	1,275	1,800	85955K134	000000

Extra-High-Temperature Electrically Insulating Mica Sheets

Line furnaces in steel mills or cover components in aerospace engine bays. These sheets maintain electrical insulating properties and strength under extreme heat. They dissipate heat slowly and predictably for precise temperature control. Because they’re abrasion resistant, they’re ideal for extreme material handling components, such as the parts that guide blown glassware pieces as they leave red-hot molds. These sheets can withstand temperatures up to 1800° F for a few minutes, but if they stay above 1275° F for too long, they may turn to carbon and stop insulating. They meet UL 94 V-0 for flame retardance. Also known as phlogopite mica.

Semi-Rigid—These sheets bend like a playing card, so they provide some spring power. Cut them with scissors, punches, or die stamps.

Rigid—Machine with high-speed steel or tungsten carbide tools.

	Thk.	Thk. Tolerance	Dielectric Strength, V/mil	Max. Continuous Temp., ° F	Max. Intermittent Temp., ° F	Flexibility		Each
10" × 12"



		1/8"	-0.0125" to 0.0125"	635	1,275	1,800	Rigid	85165K81	000000


		1/4"	-0.0250" to 0.0250"	635	1,275	1,800	Rigid	85165K82	000000
		1/2"	-0.0500" to 0.0500"	635	1,275	1,800	Rigid	85165K83	000000
		3/4"	-0.0750" to 0.0750"	635	1,275	1,800	Rigid	85165K84	000000
		1"	-0.1000" to 0.1000"	635	1,275	1,800	Rigid	85165K85	000000


		20" × 24"



				1/8"	-0.0125" to 0.0125"	635	1,275	1,800	Rigid	85165K61	000000


				1/4"	-0.0250" to 0.0250"	635	1,275	1,800	Rigid	85165K62	000000
				1/2"	-0.0500" to 0.0500"	635	1,275	1,800	Rigid	85165K63	000000
				3/4"	-0.0750" to 0.0750"	635	1,275	1,800	Rigid	85165K64	000000
				1"	-0.1000" to 0.1000"	635	1,275	1,800	Rigid	85165K65	000000


				23" × 39"



						0.004"	-0.0004" to 0.0004"	635	1,275	1,800	Semi-Rigid	85165K18	00000


						0.008"	-0.0008" to 0.0008"	635	1,275	1,800	Semi-Rigid	85165K19	00000
						0.012"	-0.0012" to 0.0012"	635	1,275	1,800	Semi-Rigid	85165K21	00000
						0.016"	-0.0016" to 0.0016"	635	1,275	1,800	Semi-Rigid	85165K22	00000
						0.020"	-0.0020" to 0.0020"	635	1,275	1,800	Semi-Rigid	85165K23	00000
						0.024"	-0.0024" to 0.0024"	635	1,275	1,800	Semi-Rigid	85165K24	00000
						0.028"	-0.0028" to 0.0028"	635	1,275	1,800	Rigid	85165K25	00000
						0.032"	-0.0032" to 0.0032"	635	1,275	1,800	Rigid	85165K26	00000
						0.036"	-0.0036" to 0.0036"	635	1,275	1,800	Rigid	85165K27	00000
						0.040"	-0.0040" to 0.0040"	635	1,275	1,800	Rigid	85165K28	00000
						0.060"	-0.0060" to 0.0060"	635	1,275	1,800	Rigid	85165K29	000000


						1/8"	-0.0125" to 0.0125"	635	1,275	1,800	Rigid	85165K31	000000
						1/4"	-0.0250" to 0.0250"	635	1,275	1,800	Rigid	85165K32	000000
						1/2"	-0.0500" to 0.0500"	635	1,275	1,800	Rigid	85165K33	000000
						3/4"	-0.0750" to 0.0750"	635	1,275	1,800	Rigid	85165K34	00000000
						1"	-0.1000" to 0.1000"	635	1,275	1,800	Rigid	85165K35	00000000


						39" × 47"



								0.004"	-0.0004" to 0.0004"	635	1,275	1,800	Semi-Rigid	85165K41	00000


								0.008"	-0.0008" to 0.0008"	635	1,275	1,800	Semi-Rigid	85165K42	00000
								0.012"	-0.0012" to 0.0012"	635	1,275	1,800	Semi-Rigid	85165K43	00000
								0.016"	-0.0016" to 0.0016"	635	1,275	1,800	Semi-Rigid	85165K44	00000
								0.020"	-0.0020" to 0.0020"	635	1,275	1,800	Semi-Rigid	85165K13	00000
								0.024"	-0.0024" to 0.0024"	635	1,275	1,800	Semi-Rigid	85165K14	00000
								0.028"	-0.0028" to 0.0028"	635	1,275	1,800	Rigid	85165K45	000000
0.032"								-0.0032" to 0.0032"	635	1,275	1,800	Rigid	85165K46	000000
0.036"	-0.0036" to 0.0036"							635	1,275	1,800	Rigid	85165K47	000000
0.040"	-0.0040" to 0.0040"							635	1,275	1,800	Rigid	85165K48	000000
0.060"	-0.0060" to 0.0060"							635	1,275	1,800	Rigid	85165K49	000000


1/8"	-0.0125" to 0.0125"							635	1,275	1,800	Rigid	85165K51	000000
1/4"	-0.0250" to 0.0250"							635	1,275	1,800	Rigid	85165K52	000000
1/2"	-0.0500" to 0.0500"							635	1,275	1,800	Rigid	85165K53	00000000
3/4"	-0.0750" to 0.0750"							635	1,275	1,800	Rigid	85165K54	00000000
1"	-0.1000" to 0.1000"							635	1,275	1,800	Rigid	85165K55	00000000

Electrically Insulating Mica Sheets

Insulate electrical components in everything from toasters to circuit breakers. These sheets provide greater vibration resistance than ceramic and withstand higher temperatures than plastic. They can operate continuously at temperatures up to 930° F, but if they stay above that temperature for too long, they may turn to carbon and stop insulating. These sheets meet UL 94 V-0 for flame retardance. Also known as muscovite mica.

Semi-Rigid—These sheets bend like a playing card, so they provide some spring power. Cut them with scissors, punches, or die stamps.

Rigid—Machine with high-speed steel or tungsten carbide tools.

	Thk.	Thk. Tolerance	Dielectric Strength, V/mil	Max. Continuous Temp., ° F	Max. Intermittent Temp., ° F	Flexibility		Each
10" × 12"



		1/8"	-0.0125" to 0.0125"	635	930	1,275	Rigid	8779K51	000000


		1/4"	-0.0250" to 0.0250"	635	930	1,275	Rigid	8779K52	00000
		1/2"	-0.0500" to 0.0500"	635	930	1,275	Rigid	8779K53	000000
		3/4"	-0.0750" to 0.0750"	635	930	1,275	Rigid	8779K54	000000
		1"	-0.1000" to 0.1000"	635	930	1,275	Rigid	8779K55	000000


		20" × 24"



				1/8"	-0.0125" to 0.0125"	635	930	1,275	Rigid	8779K31	000000


				1/4"	-0.0250" to 0.0250"	635	930	1,275	Rigid	8779K32	000000
				1/2"	-0.0500" to 0.0500"	635	930	1,275	Rigid	8779K33	000000
				3/4"	-0.0750" to 0.0750"	635	930	1,275	Rigid	8779K34	000000
				1"	-0.1000" to 0.1000"	635	930	1,275	Rigid	8779K35	000000


				23" × 39"



						0.004"	-0.0004" to 0.0004"	635	930	1,275	Semi-Rigid	8779K11	00000


						0.008"	-0.0008" to 0.0008"	635	930	1,275	Semi-Rigid	8779K12	00000
						0.012"	-0.0012" to 0.0012"	635	930	1,275	Semi-Rigid	8779K13	00000
						0.016"	-0.0016" to 0.0016"	635	930	1,275	Semi-Rigid	8779K14	00000
						0.020"	-0.0020" to 0.0020"	635	930	1,275	Semi-Rigid	8779K15	00000
						0.024"	-0.0024" to 0.0024"	635	930	1,275	Semi-Rigid	8779K16	00000
						0.028"	-0.0028" to 0.0028"	635	930	1,275	Rigid	8779K17	00000
						0.032"	-0.0032" to 0.0032"	635	930	1,275	Rigid	8779K18	00000
						0.036"	-0.0036" to 0.0036"	635	930	1,275	Rigid	8779K19	00000
						0.040"	-0.0040" to 0.0040"	635	930	1,275	Rigid	8779K21	00000
						0.060"	-0.0060" to 0.0060"	635	930	1,275	Rigid	8779K22	000000


						1/8"	-0.0125" to 0.0125"	635	930	1,275	Rigid	8779K23	000000
						1/4"	-0.0250" to 0.0250"	635	930	1,275	Rigid	8779K24	000000
						1/2"	-0.0500" to 0.0500"	635	930	1,275	Rigid	8779K25	000000
						3/4"	-0.0750" to 0.0750"	635	930	1,275	Rigid	8779K26	00000000
						1"	-0.1000" to 0.1000"	635	930	1,275	Rigid	8779K27	00000000


						39" × 47"



								0.004"	-0.0004" to 0.0004"	635	930	1,275	Semi-Rigid	8779K81	00000


								0.008"	-0.0008" to 0.0008"	635	930	1,275	Semi-Rigid	8779K82	00000
								0.012"	-0.0012" to 0.0012"	635	930	1,275	Semi-Rigid	8779K83	00000
								0.016"	-0.0016" to 0.0016"	635	930	1,275	Semi-Rigid	8779K84	00000
								0.020"	-0.0020" to 0.0020"	635	930	1,275	Semi-Rigid	8779K85	00000
								0.024"	-0.0024" to 0.0024"	635	930	1,275	Semi-Rigid	8779K86	00000
								0.028"	-0.0028" to 0.0028"	635	930	1,275	Rigid	8779K87	000000
0.032"								-0.0032" to 0.0032"	635	930	1,275	Rigid	8779K88	000000
0.036"	-0.0036" to 0.0036"							635	930	1,275	Rigid	8779K89	000000
0.040"	-0.0040" to 0.0040"							635	930	1,275	Rigid	8779K91	000000
0.060"	-0.0060" to 0.0060"							635	930	1,275	Rigid	8779K92	000000


1/8"	-0.0125" to 0.0125"							635	930	1,275	Rigid	8779K93	000000
1/4"	-0.0250" to 0.0250"							635	930	1,275	Rigid	8779K94	000000
1/2"	-0.0500" to 0.0500"							635	930	1,275	Rigid	8779K95	00000000
3/4"	-0.0750" to 0.0750"							635	930	1,275	Rigid	8779K96	00000000
1"	-0.1000" to 0.1000"							635	930	1,275	Rigid	8779K97	00000000

Flexible Electrically Insulating Mica Sheets

Also called muscovite mica, this mica is an excellent electrical insulator that resists temperatures up to 930° F. It's often used as wrap-around insulation for circuit breakers and heating elements. Meets UL 94 V-0 for flame retardance.

	Thk. Tolerance	Dielectric Strength, V/mil	Max. Temp., ° F		Each
23" × 39"



	0.004"	-0.0004" to 0.0004"	508	930	85825K41	000000


	0.008"	-0.0008" to 0.0008"	508	930	85825K42	00000
	0.012"	-0.0012" to 0.0012"	508	930	85825K43	00000
	0.016"	-0.0016" to 0.0016"	508	930	85825K44	00000
	0.020"	-0.0020" to 0.0020"	508	930	85825K45	00000
	0.024"	-0.0024" to 0.0024"	508	930	85825K46	00000

Flexible Ultra-High-Temperature Electrically Insulating Mica Sheets

The most heat-resistant mica sheets we offer. Since they can also be shaped without cracking, they’re often used to make gaskets for automotive exhaust manifolds, gas and oil burners, and heat exchangers. A silicone resin binder gives these sheets enough flex to ship in rolls, so you can use a machine to punch out parts with less waste.

These sheets won’t melt like plastic or break like ceramic, so they can insulate electrical parts exposed to high heat and vibration. They can withstand temperatures up to 2000° F for a few minutes, but if they stay above 1800° F for too long, they may turn to carbon and stop insulating. Also known as phlogopite mica.

	Thk. Tolerance	Dielectric Strength, V/mil	Max. Continuous Temp., ° F	Max. Intermittent Temp., ° F		Each
39" × 49 ft.



	0.018"	-0.0009" to 0.0009"	508	1,800	2,000	9273N11	0000000


	39" × 98 ft.



			0.018"	-0.0009" to 0.0009"	508	1,800	2,000	9273N12	00000000

Ultra-Electrically Insulating Clear Mica Sheets

The best electrical insulator for temperatures above 900° F. Use these sheets to separate and shield components in everything from electronics to motors. Cut, stamp, or shear them into shapes such as washers, which can be used to mount diodes to a heat sink. These sheets can also be used as sight glasses, often called stove mica, for areas where plastic would melt or glass would shatter. Also known as muscovite mica.

Semi-Rigid—These sheets bend like a playing card, so you’ll get a little bit of spring power.

								Each
	Thk.	Thk. Tolerance	Dielectric Strength, V/mil	Max. Continuous Temp., ° F	Max. Intermittent Temp., ° F	Flexibility		1-9	10-Up
3" × 3"



		0.004"	-0.001" to 0.001"	3,200	930	1,290	Semi-Rigid	8802K101	00000	00000


		3" × 5"



				0.004"	-0.001" to 0.001"	3,200	930	1,290	Semi-Rigid	8802K102	0000	0000


				4" × 6"



						0.004"	-0.001" to 0.001"	3,200	930	1,290	Semi-Rigid	8802K103	00000	0000


						4" × 8"



								0.004"	-0.001" to 0.001"	3,200	930	1,290	Semi-Rigid	8802K104	00000	00000


								5" × 8"



										0.004"	-0.001" to 0.001"	3,200	930	1,290	Semi-Rigid	8802K105	00000	00000


										6" × 7"



												0.004"	-0.001" to 0.001"	3,200	930	1,290	Semi-Rigid	8802K106	00000	00000


												8" × 10"



														0.004"	-0.001" to 0.001"	3,200	930	1,290	Semi-Rigid	8802K107	00000	00000


														8" × 15"



																0.004"	-0.001" to 0.001"	3,200	930	1,290	Semi-Rigid	8802K108	000000	00000