Extruded Polystyrene | McMaster-Carr

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ASTM E84 15/125 for Flame and Smoke

UL 94 HB

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2,400 psi to 4,000 psi

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77 Products

About Plastic

About Selecting Thermal Insulation

These sheets resist the absorption of water, air, and gas and are widely used in cold-storage and packaging applications.

Polypropylene-coated sheets have an added layer of moisture protection.

1 lbs./cu. ft. Density

Heat Flow Rate: 0.26 Btu @ 75° F
Color: White
Specifications Met: ASTM E84 15/125 for Flame and Smoke

						1 ft. × 12"		4 ft. × 24"
Thick.	Min. Temperature, °F	Max. Temperature, °F	R Value	Flexibility	Pkg. Qty.		Pkg.		Pkg.
Polypropylene-Coated Sheets
3/4"	Not Rated	165°	2.9	Rigid	8	00000000	000000	00000000	000000
1"	Not Rated	165°	3.8	Rigid	6	00000000	00000	00000000	00000
1 1/2"	Not Rated	165°	5.8	Rigid	4	00000000	00000	00000000	00000

1.45 lbs./cu. ft. Density

Temperature Range: -40° to 165° F
Heat Flow Rate: 0.2 Btu @ 75° F

				4 ft. × 48"
Thick.	Color	R Value	Flexibility		Each
Sheets
1"	Green	5	Rigid	0000000	000000
1 1/2"	Green	7.5	Rigid	0000000	00000
2"	Green	10	Rigid	000000	000000

Easy-to-Form Polystyrene Sheets and Strips

Color: White
Temperature Range: 0° to 185° F
Tensile Strength: 2,400-4,000 psi (Poor)
Impact Strength: 1.5 ft.-lbs./in. (Poor)
Hardness: Rockwell R70 (Hard)
For Use Outdoors: No
Specifications Met: FDA Compliant 21 CFR 177.1640, UL 94 HB

Often fabricated into signs, packaging, and light duty housings, these sheets and strips are easy to thermoform.

Sheets

		12" × 24"		36" × 36"		40" × 72"
Thick.	Thick. Tolerance		Each		Each		Each
1/32"	-0.003" to 0.003"	0000000	00000	0000000	000000	0000000	000000
1/16"	-0.005" to 0.005"	0000000	0000	0000000	00000	0000000	00000
3/32"	-0.006" to 0.006"	0000000	0000	0000000	00000	0000000	00000
1/8"	-0.008" to 0.008"	0000000	0000	0000000	00000	0000000	00000
5/32"	-0.01" to 0.01"	0000000	00000	0000000	00000	0000000	00000
3/16"	-0.012" to 0.012"	0000000	00000	0000000	00000	0000000	000000
1/4"	-0.03" to 0.03"	0000000	00000	0000000	00000	0000000	000000

Strips

		24" Lg.		48" Lg.
Thick.	Thick. Tolerance		Each		Each
2" Wd.
1/8"	-0.013" to 0.013"	0000000	00000	0000000	00000
3/16"	-0.019" to 0.019"	0000000	0000	0000000	0000
1/4"	-0.025" to 0.025"	0000000	0000	0000000	0000
4" Wd.
1/8"	-0.013" to 0.013"	0000000	0000	0000000	0000
3/16"	-0.019" to 0.019"	0000000	0000	0000000	0000
1/4"	-0.025" to 0.025"	0000000	0000	0000000	00000
6" Wd.
1/8"	-0.013" to 0.013"	0000000	0000	0000000	0000
3/16"	-0.019" to 0.019"	0000000	0000	0000000	00000
1/4"	-0.025" to 0.025"	0000000	0000	0000000	00000
8" Wd.
1/8"	-0.013" to 0.013"	0000000	0000	0000000	00000
3/16"	-0.019" to 0.019"	0000000	0000	0000000	00000
1/4"	-0.025" to 0.025"	0000000	00000	0000000	00000

Easy-to-Form Polystyrene Rods

Color: White
Temperature Range: -10° to 170° F
Tensile Strength: 2,400-4,000 psi (Poor)
Impact Strength: 1.5 ft.-lbs./in. (Poor)
Hardness: Rockwell R70 (Hard)
For Use Outdoors: No
Specifications Met: FDA Compliant 21 CFR 177.1640, UL 94 HB

Easy to thermoform, these rods are often molded into parts for displays and shelves.

				Per Ft.
Dia.	Dia. Tolerance	Lengths, ft.		Each
1/4"	0.000" to 0.1"	8	0000000	000000
3/8"	0.000" to 0.1"	8	0000000	00000
1/2"	0.000" to 0.1"	8	0000000	00000
5/8"	0.000" to 0.1"	1, 2, 3, 4, 5, 6, 7, 8	0000000	0000
3/4"	0.000" to 0.1"	1, 2, 3, 4, 5, 6, 7, 8	0000000	0000
1"	0.000" to 0.1"	1, 2, 3, 4, 5, 6, 7, 8	0000000	00000
1 1/2"	0.000" to 0.1"	1, 2, 3, 4, 5, 6, 7, 8	0000000	00000
2"	0.000" to 0.1"	1, 2, 3, 4, 5, 6, 7, 8	0000000	00000

Electrical-Insulating Polystyrene Sheets

Color: Semi-Clear Off-White
Temperature Range: -75° to 212° F
Tensile Strength: 9,000 psi (Good)
Impact Strength: 0.3 ft.-lbs./in. (Poor)
Hardness: Rockwell R130 (Hard)
For Use Outdoors: No
Specifications Met: FDA Compliant 21 CFR 177.2710, Fed. Spec. L-P-516

Known for its electrical insulating properties, these sheets are often used for cable connectors, electrical housings, and in microwave applications. This material is also called Rexolite.

			6" × 6"		6" × 12"		12" × 12"
Thick.	Thick. Tolerance	Dielectric Strength		Each		Each		Each
1/8"	0" to 0.008"	500 V/mil	0000000	000000	0000000	0000000	0000000	0000000
1/4"	0" to 0.008"	500 V/mil	0000000	00000	0000000	000000	0000000	000000
1/2"	0" to 0.012"	500 V/mil	0000000	00000	0000000	000000	0000000	000000

Electrical-Insulating Polystyrene Rods

Color: Semi-Clear Off-White
Temperature Range: -75° to 212° F
Tensile Strength: 9,000 psi (Good)
Impact Strength: 0.3 ft.-lbs./in. (Poor)
Hardness: Rockwell R130 (Hard)
For Use Outdoors: No
Specifications Met: FDA Compliant 21 CFR 177.2710, Fed. Spec. L-P-516

These rods are made of a material known as Rexolite. They are electrically insulating and often used for cable connectors, electrical housings, and in microwave applications.

Dia.	Dia. Tolerance	Dielectric Strength	Lengths, ft.		Per Ft.
1/8"	-0.002" to 0.002"	500 V/mil	1, 2, 4	0000000	00000
1/4"	-0.002" to 0.002"	500 V/mil	1, 2, 4	0000000	0000
3/8"	-0.002" to 0.002"	500 V/mil	1, 2, 4	0000000	0000
1/2"	-0.002" to 0.002"	500 V/mil	1, 2, 4	0000000	0000
3/4"	-0.002" to 0.002"	500 V/mil	1, 2, 4	0000000	00000
1"	-0.002" to 0.002"	500 V/mil	1, 2, 4	0000000	00000