Muscovite Mica | McMaster-Carr

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Maximum Temperature

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Performance

Electrically Insulating

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Dielectric Strength

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Thermal Conductivity @ Temperature

3.72 BTU⋅in/(hr⋅ft²⋅°F) @ 73° F

1.39 BTU⋅in/(hr⋅ft²⋅°F) @ 212° F

2.08 BTU⋅in/(hr⋅ft²⋅°F) @ 500° F

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

DFARS Specialty Metals

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Minimum Temperature

Tensile Strength

Maximum Intermittent Temperature

REACH

RoHS

Thermal Conductivity

Density

2.6 g/cm³ to 3.2 g/cm³

Wall Thickness

Mica Grade

62 Products

Electrically Insulating Mica Tubes

Also called muscovite mica, this mica is an excellent electrical insulator that resists temperatures up to 930° F. It's often used to insulate circuit breakers and heating elements.

				24" Long
OD	ID	Dielectric Strength, V/mil	Max. Temp., ° F		Each







			1/16" Thick Wall

			3/8"	1/4"	550	930	5067K11	000000


			1/2"	3/8"	550	930	5067K14	00000
			5/8"	1/2"	550	930	5067K17	00000
			3/4"	5/8"	550	930	5067K21	00000




					1/8" Thick Wall

					3/4"	1/2"	550	930	5067K48	00000




							5/32" Thick Wall

							5/8"	5/16"	550	930	5067K46	00000

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

A resin binder gives these sheets enough flexibility to be used as wrap-around electrical or thermal insulation. They 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. They meet UL 94 V-0 for flame retardance. Cut these sheets with scissors, die stamps, or punches. Also known as muscovite mica.

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



	0.004"	-0.0004" to 0.0004"	508	930	1,470	85825K41	000000


	0.008"	-0.0008" to 0.0008"	508	930	1,470	85825K42	00000
	0.012"	-0.0012" to 0.0012"	508	930	1,470	85825K43	00000
	0.016"	-0.0016" to 0.0016"	508	930	1,470	85825K44	00000
	0.020"	-0.0020" to 0.0020"	508	930	1,470	85825K45	00000
	0.024"	-0.0024" to 0.0024"	508	930	1,470	85825K46	00000

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