Glass Wool | McMaster-Carr

	Thickness Thickness

1/8"

1/2"

	Width Width

	Length Length

	Maximum Temperature Maximum Temperature

	Flexibility Flexibility

Flexible

Semi-Rigid

Rigid

	For Use On For Use On

Enclosures and Equipment

	Material Material

Fiberglass

Fabric

Quartz

	R Value R Value

0.6
1.7
3.3
3.7
3.8
4.3
4.5
4.8

5
5.6
5.8
6
6.3
6.4
6.5
7.4

7.7
8.4
8.7
11
12.5
16.5
19

	Color Color

	White		Green
	Gold		Gray
	Brown		Yellow

	Density Density

	Heat Flow Rate Heat Flow Rate

	Specifications Met Specifications Met

ASTM

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Minimum Temperature Minimum Temperature

	Facing Material Facing Material

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	For Use With For Use With

Acid Gases

Acids

	Facing Color Facing Color

	Silver
	White
	Beige

	Fiber Diameter Fiber Diameter

4 microns

9 microns

	Weight Weight

0.35 oz.

0.5 lbs.

1 lbs.

	Reinforcement Location Reinforcement Location

One Side

Two Sides

	Minimum Facing Temperature Minimum Facing Temperature

-40° F

0° F

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85 Products

About Selecting Thermal Insulation

Without Reinforcement

With Wire-Mesh Reinforcement

With Foil Facing

Temperature Range: 0° to 1200° F
Heat Flow Rate: See Table
Density: 8 lbs./cu. ft.
Color: Green
Specifications Met: See Table

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

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

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

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

Sheets
Thick.	Wd.	Lg., ft.	R Value	Heat Flow Rate	Flexibility	Performance Properties	Specifications Met		Each
1"	24"	4	4.3	0.23 Btu @ 75° F	Semi-Rigid	__	ASTM E84 25/50 for Flame and Smoke	0000000	00000
1 1/2"	24"	4	6.5	0.23 Btu @ 75° F	Semi-Rigid	__	ASTM E84 25/50 for Flame and Smoke	0000000	00000
2"	24"	4	8.7	0.23 Btu @ 75° F	Semi-Rigid	__	ASTM E84 25/50 for Flame and Smoke	0000000	00000
Sheets with Wire-Mesh Reinforcement on One Side
1"	24"	4	4.3	0.23 Btu @ 75° F	Semi-Rigid	Flame Resistant	ASTM E84 0/0 for Flame and Smoke	0000000	00000
1 1/2"	24"	4	6.5	0.23 Btu @ 75° F	Semi-Rigid	Flame Resistant	ASTM E84 0/0 for Flame and Smoke	0000000	00000
2"	24"	4	8.7	0.23 Btu @ 75° F	Semi-Rigid	Flame Resistant	ASTM E84 0/0 for Flame and Smoke	0000000	00000
3"	24"	4	12.5	0.24 Btu @ 75° F	Semi-Rigid	Flame Resistant	ASTM E84 0/0 for Flame and Smoke, ASTM E84 25/50 for Flame and Smoke	00000000	00000
4"	24"	4	16.5	0.24 Btu @ 75° F	Semi-Rigid	Flame Resistant	ASTM E84 0/0 for Flame and Smoke, ASTM E84 25/50 for Flame and Smoke	00000000	00000
Sheets with Wire-Mesh Reinforcement on Two Sides
1"	24"	4	4.3	0.23 Btu @ 75° F	Semi-Rigid	Flame Resistant	ASTM E84 0/0 for Flame and Smoke	0000000	00000
1 1/2"	24"	4	6.5	0.23 Btu @ 75° F	Semi-Rigid	Flame Resistant	ASTM E84 0/0 for Flame and Smoke	0000000	00000
2"	24"	4	8.7	0.23 Btu @ 75° F	Semi-Rigid	Flame Resistant	ASTM E84 0/0 for Flame and Smoke	0000000	00000
3"	24"	4	12.5	0.24 Btu @ 75° F	Semi-Rigid	Flame Resistant	ASTM E84 0/0 for Flame and Smoke, ASTM E84 25/50 for Flame and Smoke	00000000	00000
4"	24"	4	16.5	0.24 Btu @ 75° F	Semi-Rigid	Flame Resistant	ASTM E84 0/0 for Flame and Smoke, ASTM E84 25/50 for Flame and Smoke	00000000	00000
Sheets with Foil Facing
1"	24"	4	4.3	0.24 Btu @ 75° F	Semi-Rigid	Flame Resistant	ASTM E84 0/0 for Flame and Smoke, ASTM E84 25/50 for Flame and Smoke	00000000	00000
1 1/2"	24"	4	6.5	0.24 Btu @ 75° F	Semi-Rigid	Flame Resistant	ASTM E84 0/0 for Flame and Smoke, ASTM E84 25/50 for Flame and Smoke	00000000	00000
2"	24"	4	8.7	0.24 Btu @ 75° F	Semi-Rigid	Flame Resistant	ASTM E84 0/0 for Flame and Smoke, ASTM E84 25/50 for Flame and Smoke	00000000	00000
3"	24"	4	12.5	0.24 Btu @ 75° F	Semi-Rigid	Flame Resistant	ASTM E84 0/0 for Flame and Smoke, ASTM E84 25/50 for Flame and Smoke	00000000	00000
4"	24"	4	16.5	0.24 Btu @ 75° F	Semi-Rigid	Flame Resistant	ASTM E84 0/0 for Flame and Smoke, ASTM E84 25/50 for Flame and Smoke	00000000	00000

Fiberglass Insulation Sheets

These lightweight, flexible fiberglass sheets are typically used to insulate equipment and appliances.

For Enclosures and Equipment

Temperature Range: 0° to 350° F
Heat Flow Rate: 0.26 Btu @ 75° F
Density: 0.95 lbs./cu. ft.
Color: Yellow
Specifications Met: ASTM E84 25/50 for Flame and Smoke

Sheets with temperature range of 0° to 350° F can be layered to increase efficiency.

Thick.	Wd.	Lg., ft.	R Value	Flexibility		Each
1"	48"	10	3.8	Flexible	0000000	000000
2"	48"	10	7.7	Flexible	0000000	00000
2"	48"	100	7.7	Flexible	0000000	000000
3 1/2"	48"	10	3.8	Flexible	0000000	00000
3 1/2"	48"	72	3.8	Flexible	0000000	000000

For Enclosures and Equipment/Ovens and Furnaces

Temperature Range: 0° to 1000° F
Heat Flow Rate: 0.26 Btu @ 75° F
Density: 2.4 lbs./cu. ft.
Color: Gray
Specifications Met: ASTM E84 25/50 for Flame and Smoke

Sheets with temperature range of 0° to 1000° F are suitable for use in ovens. To use outdoors, add metal jacketing (sold separately).

Thick.	Wd.	Lg., ft.	R Value	Flexibility		Each
1"	24"	8	3.8	Flexible	0000000	000000
1 1/2"	24"	8	5.8	Flexible	0000000	00000
2"	24"	8	7.7	Flexible	0000000	00000

Thermally Stable Composite Paper Insulation Sheets

Max. Temperature: 1100° F
Heat Flow Rate: 0.22 Btu @ 75° F
Density: 8.7 lbs./cu. ft.
Color: White
Specifications Met: UL 94 V-0

Made of flexible composite paper, these sheets won't shrink or lose shape in the high temperatures of air furnaces and hot water tanks.

				5 ft.		10 ft.		20 ft.
Thick.	Wd.	R Value	Flexibility		Each		Each		Each
1/8"	16"	0.6	Flexible	0000000	000000	0000000	000000	0000000	000000
1/8"	24"	0.6	Flexible	0000000	00000	0000000	00000	0000000	000000
1/8"	48"	0.6	Flexible	0000000	00000	0000000	000000	0000000	000000

Fiberglass Building Insulation Sheets and Strips

Also known as batts, these fiberglass sheets and strips are used to insulate walls, ceilings, and floors.

Sheets/strips with moisture barrier prevent condensation from forming. Use electrical tape to secure the ends.

Sheets/strips with kraft paper facing can be layered to increase thermal efficiency. Seal with reinforced insulation tape (sold separately).

Sheets

Without Facing or Moisture Barrier

Temperature Range: Not Rated
Heat Flow Rate: 0.32 Btu @ 75° F
Density: 0.5 lbs./cu. ft.
Color: Brown
Specifications Met: ASTM E84 25/50 for Flame and Smoke

Thick.	Wd.	Lg., ft.	R Value	Flexibility	Pkg. Qty.		Pkg.
3 1/2"	16"	8	11	Flexible	16	00000000	0000000
6 1/4"	24"	8	19	Flexible	9	00000000	000000

Sheets with Moisture Barrier

With Moisture Barrier

Temperature Range: -50° to 250° F
Heat Flow Rate: 0.3 Btu @ 75° F
Density: 0.6 lbs./cu. ft.
Color: Gold
Specifications Met: ASTM E84 25/50 for Flame and Smoke

Thick.	Wd.	Lg., ft.	R Value	Flexibility		Each
1/2"	3"	35	1.7	Flexible	000000	00000
1"	3"	25	3.3	Flexible	000000	00000

Sheets with Kraft Paper Facing

With Kraft Paper Facing

Temperature Range: Not Rated
Heat Flow Rate: 0.32 Btu @ 75° F
Density: 0.5 lbs./cu. ft.
Color: Brown
Facing Color: Beige

Thick.	Wd.	Lg., ft.	R Value	Flexibility	Pkg. Qty.		Pkg.
3 1/2"	16"	8	11	Flexible	16	00000000	0000000

Reinforced Insulation Tape

00000000

Each

000000

Flexible Fiberglass Duct Insulation Sheets

Wrap rectangular and round ductwork with this flexible insulation. Seal with reinforced HVAC tape (not included).

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

Sheets with vinyl facing are tear resistant.

Sheets with Foil Facing

With Foil Facing

Temperature Range: 0° to 250° F
Heat Flow Rate: 0.26 Btu @ 75° F
Color: Brown
Facing Color: Silver
Specifications Met: ASTM E84 25/50 for Flame and Smoke

			10 ft. × 48"		50 ft. × 48"		75 ft. × 48"		100 ft. × 48"
Thick.	R Value	Flexibility		Each		Each		Each		Each
1 1/2"	4.5	Flexible	0000000	000000	000000	00	000000	00	0000000	0000000
1 1/2"	4.8	Flexible	0000000	00000	000000	00	0000000	0000000	000000	00
1 1/2"	5	Flexible	000000	00000	000000	00	000000	00	000000	000000
2"	5.6	Flexible	0000000	00000	000000	00	0000000	000000	000000	00
2"	6	Flexible	0000000	00000	000000	00	0000000	000000	000000	00
2"	6.4	Flexible	0000000	00000	0000000	0000000	000000	00	000000	00
2 3/16"	6	Flexible	0000000	00000	000000	00	0000000	000000	000000	00
3"	8.4	Flexible	0000000	00000	0000000	000000	000000	00	000000	00

Reinforced HVAC Tape

00000000

Each

00000

Sheets with Vinyl Facing

With Vinyl Facing

Temperature Range: Not Rated
Heat Flow Rate: 0.26 Btu @ 75° F
Density: 0.95 lbs./cu. ft.
Color: Yellow
Facing Color: White

			10 ft. × 48"		100 ft. × 48"
Thick.	R Value	Flexibility		Each		Each
2"	7.7	Flexible	0000000	000000	0000000	0000000

Reinforced HVAC Tape

00000000

Each

00000

Flame-Resistant Flexible Synthetic Fiber Duct Insulation Sheets

Max. Temperature: 1830° F
Heat Flow Rate: 1.93 Btu @ 1500° F
Density: 6 lbs./cu. ft.
Color: White
Facing Color: Silver
Specifications Met: ASTM E84 0/0 for Flame and Smoke

Also known as fire wrap, these flame-resistant sheets meet ASTM E84 0/0 for flame and smoke and create a fire barrier around rectangular and round ductwork. They are often used to wrap kitchen grease exhaust ducts and air ducts. Seal with reinforced HVAC tape (sold separately).

			25 ft. × 24"		25 ft. × 48"
Thick.	R Value	Flexibility		Each		Each
1 1/2"	6.3	Flexible	00000000	0000000	00000000	0000000

Reinforced HVAC Tape

0000000

Each

000000

Rigid Fiberglass Duct Insulation Sheets

With Foil Facing

With Kraft Paper Facing

Temperature Range: 0° to 450° F
Facing Temperature Range: 0° to 150° F
Heat Flow Rate: 0.23 Btu @ 75° F
Density: See table
Color: Yellow
Facing Color:
Foil Facing: Silver;
Kraft Paper Facing: White
Specifications Met: ASTM E84 25/50 for Flame and Smoke

Insulate rectangular ductwork.

Sheets with foil facing reflect heat. The foil facing is also known as foil scrim kraft (FSK). Seal with reinforced HVAC tape (sold separately).

To seal sheets with kraft paper facing, use reinforced insulation tape (sold separately).

					Sheets with Foil Facing		Sheets with Kraft Paper Facing
Thick.	Wd.	Lg., ft.	R Value	Flexibility		Each		Each
3 lbs./cu. ft. Density
1"	24"	4	4.3	Rigid	000000	000000	000000	000000
1 1/2"	24"	4	6.5	Rigid	000000	00000	000000	00000
2"	24"	4	8.7	Rigid	000000	00000	000000	00000
6 lbs./cu. ft. Density
1"	24"	4	4.3	Rigid	000000	00000	000000	00000
1 1/2"	24"	4	6.5	Rigid	000000	00000	000000	00000
2"	24"	4	8.7	Rigid	000000	00000	000000	00000

Reinforced Insulation Tape for Sheets with Kraft Paper Facing	00000000	Each	000000
Reinforced HVAC Tape for Sheets with Foil Facing	00000000	Each	0000

Fiberglass Pipe Insulation

This common insulation material is typically used on hot and cold water lines and in process piping. To use outdoors, add metal jacketing.

Sheets/strips with foil facing reflect heat away from pipe. The foil facing is also known as FSK. Seal with reinforced HVAC tape (sold separately).

Sheets/strips with kraft paper facing have an all-service jacket (ASJ) made of kraft paper. Seal with reinforced insulation tape (sold separately).

Sheets/Strips with Foil Facing

Sheet/Strip with Foil Facing

Temperature Range: -60° to 450° F
Facing Temperature Range: -40° to 150° F
Heat Flow Rate: 0.27 Btu @ 75° F
Density: 3 lbs./cu. ft.
Color: Yellow
Facing Color: Silver

Thick.	Wd.	Lg., ft.	R Value	Flexibility		Each
1"	36"	20	3.7	Flexible	0000000	0000000
1 1/2"	36"	20	5.6	Flexible	0000000	000000
2"	36"	20	7.4	Flexible	0000000	000000

Reinforced HVAC Tape (3" × 30 ft.)

00000000

Each

00000

Sheets/Strips with Kraft Paper Facing

Sheet/Strip with Kraft Paper Facing

Temperature Range: -60° to 450° F
Facing Temperature Range: -40° to 150° F
Heat Flow Rate: 0.27 Btu @ 75° F
Density: 3 lbs./cu. ft.
Color: Yellow
Facing Color: White

Thick.	Wd.	Lg., ft.	R Value	Flexibility		Each
1"	36"	20	3.7	Flexible	0000000	0000000
1 1/2"	36"	20	5.6	Flexible	0000000	000000
2"	36"	20	7.4	Flexible	0000000	000000

Reinforced Insulation Tape (3" × 30 ft.)

00000000

Each

000000

Ultra-High-Temperature Quartz Glass Filter Wool

Form unique shapes inside filters to sift corrosive liquids and gases at temperatures up to 1900°F. Because this wool is flexible, it’s good for use inside tubing and other lab equipment that doesn’t support flat filters. It won’t expand or contract when used with harsh materials, such as acids and acidic gases; however, hydrofluoric and phosphoric acids will eat away at the quartz material. Unlike natural quartz, this quartz is more than 99.95% pure, which means it won’t let in contaminants and is useful in applications where maintaining purity is crucial.

99.95% Quartz
Fiber Diameter, microns	Weight	Maximum Temperature, °F	Reusable	For Use With	Filter Efficiency	Color		Each
4	0.35 oz.	1900°	Yes	Acid Gases, Acids	Not Rated	White	00000000	000000
4	0.5 lbs.	1900°	Yes	Acid Gases, Acids	Not Rated	White	00000000	000000
9	0.5 lbs.	1900°	Yes	Acid Gases, Acids	Not Rated	White	00000000	000000
9	1 lbs.	1900°	Yes	Acid Gases, Acids	Not Rated	White	00000000	000000

About Selecting Thermal Insulation

Rigid Mineral Wool Insulation Sheets

Fiberglass Insulation Sheets

Thermally Stable Composite Paper Insulation Sheets

Fiberglass Building Insulation Sheets and Strips

Flexible Fiberglass Duct Insulation Sheets

Flame-Resistant Flexible Synthetic Fiber Duct Insulation Sheets

Rigid Fiberglass Duct Insulation Sheets

Fiberglass Pipe Insulation

Ultra-High-Temperature Quartz Glass Filter Wool