Polystyrene Sheet Stock | McMaster-Carr

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About Plastic

Compare over 25 types of plastic to find the right material for you.

Plastic Selector Packs

You'll get one piece of each material listed, except the Multipurpose pack, where you'll get two pieces (one piece of nylon 6/6 and one piece of cast nylon).

Performance	Material	Wd.	Lg.	No. of Pieces		Each
Multipurpose	Delrin® Acetal, HDPE, ABS, Nylon, LDPE, Noryl PPO, Polyester Plastic, Polystyrene, Rexolite Polystyrene, UHMW Polyethylene	2"	2"	11	5331K93	000000

Easy-Thermoform Polystyrene Sheets

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

	Lg.	Fabrication	Min. Temp., ° F	Max. Temp., ° F	Color	Flammability Rating	Food Industry Std.		Each
1/32" Thick (-0.003" to 0.003" Tolerance)



	12"	24"	Extruded	0	185	White	UL 94 HB	FDA Standard	8734K31	00000


	36"	36"	Extruded	0	185	White	UL 94 HB	FDA Standard	8734K38	00000
	40"	72"	Extruded	0	185	White	UL 94 HB	FDA Standard	8734K29	00000


	1/16" Thick (-0.005" to 0.005" Tolerance)



			12"	24"	Extruded	0	185	White	UL 94 HB	FDA Standard	8734K32	0000


			36"	36"	Extruded	0	185	White	UL 94 HB	FDA Standard	8734K39	00000
			40"	72"	Extruded	0	185	White	UL 94 HB	FDA Standard	8734K22	00000


			3/32" Thick (-0.006" to 0.006" Tolerance)



					12"	24"	Extruded	0	185	White	UL 94 HB	FDA Standard	8734K33	0000


					36"	36"	Extruded	0	185	White	UL 94 HB	FDA Standard	8734K41	00000
					40"	72"	Extruded	0	185	White	UL 94 HB	FDA Standard	8734K24	00000


					1/8" Thick (-0.008" to 0.008" Tolerance)



							12"	24"	Extruded	0	185	White	UL 94 HB	FDA Standard	8734K34	0000


							36"	36"	Extruded	0	185	White	UL 94 HB	FDA Standard	8734K42	00000
							40"	72"	Extruded	0	185	White	UL 94 HB	FDA Standard	8734K25	00000


							5/32" Thick (-0.01" to 0.01" Tolerance)



									12"	24"	Extruded	0	185	White	UL 94 HB	FDA Standard	8734K35	00000


									36"	36"	Extruded	0	185	White	UL 94 HB	FDA Standard	8734K43	00000
									40"	72"	Extruded	0	185	White	UL 94 HB	FDA Standard	8734K26	00000


									3/16" Thick (-0.012" to 0.012" Tolerance)



											12"	24"	Extruded	0	185	White	UL 94 HB	FDA Standard	8734K36	00000


											36"	36"	Extruded	0	185	White	UL 94 HB	FDA Standard	8734K44	00000
											40"	72"	Extruded	0	185	White	UL 94 HB	FDA Standard	8734K27	000000


1/4" Thick (-0.03" to 0.03" Tolerance)



											12"	24"	Extruded	0	185	White	UL 94 HB	FDA Standard	8734K37	00000


											36"	36"	Extruded	0	185	White	UL 94 HB	FDA Standard	8734K45	00000
											40"	72"	Extruded	0	185	White	UL 94 HB	FDA Standard	8734K28	000000

Moisture-Resistant Low-Temperature Rigid Polystyrene Foam Insulation Sheets

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

1 lb/ft³ Density

Image of Product. Front orientation. Insulation Sheets. Moisture-Resistant Low-Temperature Rigid Polystyrene Foam Insulation Sheets.

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

									1 ft. × 12"		4 ft. × 24"
	Thk.	Max. Temp., ° F	Insulation R Value	Flexibility	Heat Flow Rate @ Temp.	Color	Flammability Rating	Pkg. Qty.		Pkg.		Pkg.
Polypropylene Coated



		3/4"	165	2.9	Rigid	0.26 BTU/hr @ 75° F	White	ASTM E84 15/125 for Flame and Smoke	8	93475K61	000000	93475K62	000000


		1"	165	3.8	Rigid	0.26 BTU/hr @ 75° F	White	ASTM E84 15/125 for Flame and Smoke	6	93475K63	00000	93475K64	00000
		1 1/2"	165	5.8	Rigid	0.26 BTU/hr @ 75° F	White	ASTM E84 15/125 for Flame and Smoke	4	93475K65	00000	93475K66	00000

1.45 lb/ft³ Density

	Temperature, ° F						4 ft. × 48"
Thk.	Min.	Max.	Insulation R Value	Flexibility	Heat Flow Rate @ Temp.	Color		Each



	1"	-40	165	5	Rigid	0.2 BTU/hr @ 75° F	Green	9255K11	000000


	1 1/2"	-40	165	7.5	Rigid	0.2 BTU/hr @ 75° F	Green	9255K12	00000
	2"	-40	165	10	Rigid	0.2 BTU/hr @ 75° F	Green	9255K4	000000

Easy-Thermoform Polystyrene Strips

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

							2 ft. Long		4 ft. Long
	Wd.	Fabrication	Temp., ° F	Color	Flammability Rating	Food Industry Std.		Each		Each
1/8" Thick (-0.013" to 0.013" Tolerance)



		2"	Extruded	0 to 185	White	UL 94 HB	FDA Standard	1195N22	00000	1195N21	00000


		4"	Extruded	0 to 185	White	UL 94 HB	FDA Standard	1195N42	0000	1195N41	0000
		6"	Extruded	0 to 185	White	UL 94 HB	FDA Standard	1195N62	0000	1195N61	0000
		8"	Extruded	0 to 185	White	UL 94 HB	FDA Standard	1195N82	0000	1195N81	00000


		3/16" Thick (-0.019" to 0.019" Tolerance)



				2"	Extruded	0 to 185	White	UL 94 HB	FDA Standard	1195N24	0000	1195N23	0000


				4"	Extruded	0 to 185	White	UL 94 HB	FDA Standard	1195N44	0000	1195N43	0000
				6"	Extruded	0 to 185	White	UL 94 HB	FDA Standard	1195N64	0000	1195N63	00000
				8"	Extruded	0 to 185	White	UL 94 HB	FDA Standard	1195N84	0000	1195N83	00000


				1/4" Thick (-0.025" to 0.025" Tolerance)



						2"	Extruded	0 to 185	White	UL 94 HB	FDA Standard	1195N26	0000	1195N25	0000


						4"	Extruded	0 to 185	White	UL 94 HB	FDA Standard	1195N46	0000	1195N45	00000
						6"	Extruded	0 to 185	White	UL 94 HB	FDA Standard	1195N66	0000	1195N65	00000
						8"	Extruded	0 to 185	White	UL 94 HB	FDA Standard	1195N86	00000	1195N85	00000

Breakaway Rectangular Shims

Make size adjustments easy with these scored shims—just break off pieces for a custom fit around fasteners or corners. Designed to fill wide gaps, they’re best for aligning cabinets, doors, and windows. All are made of plastic to resist moisture and prevent rot.

									Pkg.
	Thk.	Thk. Tolerance	Score Interval	Color	Material	Specs. Met	Pkg. Qty.		1-4	5-Up
6" Lg. × 6" Wd.



		0.0625"	-0.032" to 0.032"	2" × 6"	Black	Polystyrene	ASTM D638	8	95015K5	00000	00000

Ultra Electrical Insulating Rexolite Polystyrene Sheets

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.

	Lg.	Fabrication	Min. Temp., ° F	Max. Temp., ° F	Color	Mil. Spec.	Food Industry Std.		Each
1/8" Thick (0" to 0.008" Tolerance)



	6"	6"	Cast	-75	212	Semi-Clear Off-White	Fed. Spec. L-P-516	FDA Standard	1491T11	000000


	6"	12"	Cast	-75	212	Semi-Clear Off-White	Fed. Spec. L-P-516	FDA Standard	1491T21	000000
	12"	12"	Cast	-75	212	Semi-Clear Off-White	Fed. Spec. L-P-516	FDA Standard	1491T31	000000


	1/4" Thick (0" to 0.008" Tolerance)



			6"	6"	Cast	-75	212	Semi-Clear Off-White	Fed. Spec. L-P-516	FDA Standard	1491T12	00000


			6"	12"	Cast	-75	212	Semi-Clear Off-White	Fed. Spec. L-P-516	FDA Standard	1491T22	000000
			12"	12"	Cast	-75	212	Semi-Clear Off-White	Fed. Spec. L-P-516	FDA Standard	1491T32	000000


			1/2" Thick (0" to 0.012" Tolerance)



					6"	6"	Cast	-75	212	Semi-Clear Off-White	Fed. Spec. L-P-516	FDA Standard	1491T13	00000


					6"	12"	Cast	-75	212	Semi-Clear Off-White	Fed. Spec. L-P-516	FDA Standard	1491T23	000000
					12"	12"	Cast	-75	212	Semi-Clear Off-White	Fed. Spec. L-P-516	FDA Standard	1491T33	000000

Rectangular Shims

Image of Product. Front orientation. Shims. Rectangle, Sold Individually.

Sized to fill wide gaps, use these shims straight out of the box or cut to your exact needs with a utility knife to align cabinets, doors, and windows. Each shim is color coded by thickness to quickly spot and grab the right size, saving time and reducing sizing errors. All are made of plastic to resist moisture and prevent rot. Their textured surface keeps them from sliding apart when stacked.

	Thk. Tolerance	Color	Material	Specs. Met	Pkg. Qty.		Pkg.
6" Lg. × 4" Wd.



	0.0625"	-0.03" to 0.03"	Yellow	Polystyrene	ASTM D785	10	95015K41	000000