Hard Fiber Squares | McMaster-Carr

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	System of Measurement System of Measurement

Inch

	Material Material	Show

Hard Fiber

	Material Material	Hide

	Thickness Thickness

	Width Width

12"

	Performance Properties Performance Properties

	Flexibility Flexibility

	Rigid

	Shape Shape

	Sheet and Bar

	Specifications Met Specifications Met

Mil. Spec.

	Electrical Insulation Rating Electrical Insulation Rating

Good

Poor

	Backing Type Backing Type

	Plain

	Color Color

	Gray

	Dielectric Strength Dielectric Strength

	Texture Texture

	Smooth

	Clarity Clarity

Opaque

	Maximum Temperature Maximum Temperature

Less than 500° F

	For Use Outdoors For Use Outdoors

	Impact Strength Rating Impact Strength Rating

Good

	Impact Strength Impact Strength

1.8-2.5 ft.-lbs./in.

2.5 ft.-lbs./in.

	Length Length

1ft.

	Hardness Rating Hardness Rating

Hard

Rockwell R70

Rockwell R80

	Tensile Strength Rating Tensile Strength Rating

Good

Not Rated

	Tensile Strength Tensile Strength

9,000-21,000 psi

10,000-21,000 psi

Not Rated

	Compressive Strength Compressive Strength

35,000 psi

	Flexural Strength Flexural Strength

18 Products

About Composites

Color: Gray
Max. Temperature: 235° F
Tensile Strength: See Table
Impact Strength: 2.5 ft.-lbs./in. (Good)
Hardness: Rockwell R70 (Hard)
For Use Outdoors: No
Specifications Met: MIL-I-695A, UL 94HB

Widely known as fishpaper and vulcanized fiber, these thin sheets offer better electrical insulation than standard hard fiber sheets. They are constructed from lightweight cotton fabric that's been chemically treated to make it hard and dense.

			12" × 12"
Thick.	Thick. Tolerance	Tensile Strength		Each
0.005"	-0.001" to 0.001"	9,000-21,000 psi (Good)	0000000	00000
0.01"	-0.001" to 0.001"	9,000-21,000 psi (Good)	0000000	0000
0.015"	-0.002" to 0.002"	9,000-21,000 psi (Good)	0000000	0000
0.02"	-0.002" to 0.002"	Not Rated	0000000	0000
0.025"	-0.003" to 0.003"	Not Rated	0000000	00000
0.03"	-0.003" to 0.003"	Not Rated	0000000	00000
0.04"	-0.004" to 0.004"	Not Rated	0000000	00000
0.045"	-0.005" to 0.005"	Not Rated	0000000	00000
0.062"	-0.007" to 0.007"	10,000-21,000 psi (Good)	0000000	00000

Easy-to-Machine Hard Fiber Sheets

Color: Gray
Max. Temperature: 235° F
Tensile Strength: 9,000-21,000 psi (Good)
Impact Strength: 1.8-2.5 ft.-lbs./in. (Good)
Hardness: See table
For Use Outdoors: No
Specifications Met: See table

Also known as vulcanized fiber, these hard fiber sheets can be readily machined and punched into custom parts. They're constructed from lightweight cotton fabric that's been chemically treated to make them hard and dense. Use hard fiber to make gears and bushings.

For technical drawings and 3-D models, click on a part number.

				12" × 12"
Thick.	Thick. Tolerance	Hardness	Specifications Met		Each
0.02"	-0.002" to 0.002"	Rockwell R70 (Hard)	MIL-I-695A, UL 94HB	0000000	00000
0.03"	-0.003" to 0.003"	Rockwell R70 (Hard)	MIL-I-695A, UL 94HB	0000000	00000
1/16"	-0.005" to 0.005"	Rockwell R80 (Hard)	MIL-F-10336A, MIL-F-1148A, UL 94HB	0000000	00000
3/32"	-0.007" to 0.007"	Rockwell R80 (Hard)	MIL-F-10336A, MIL-F-1148A, UL 94HB	0000000	00000
1/8"	-0.015" to 0.015"	Rockwell R80 (Hard)	MIL-F-10336A, MIL-F-1148A, UL 94HB	0000000	00000
3/16"	-0.015" to 0.015"	Rockwell R80 (Hard)	MIL-F-10336A, MIL-F-1148A, UL 94HB	0000000	00000
1/4"	-0.015" to 0.015"	Rockwell R80 (Hard)	MIL-F-10336A, MIL-F-1148A, UL 94HB	0000000	00000
3/8"	-0.02" to 0.02"	Rockwell R80 (Hard)	MIL-F-10336A, MIL-F-1148A, UL 94HB	0000000	000000
1/2"	-0.025" to 0.025"	Rockwell R80 (Hard)	MIL-F-10336A, MIL-F-1148A, UL 94HB	0000000	000000

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Electrically Insulating Hard Fiber

Easy-to-Machine Hard Fiber Sheets