Marine Boards | McMaster-Carr

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Highly Electrical Insulating

For Use With

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

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Specifications Met

Coefficient of Friction

0.31

Not Rated

Water Absorption

0.05%

Dielectric Strength

450 V/mil to 500 V/mil

Comparable To

148 Products

About Plastic

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

Marine-Grade HDPE Sheets

Withstand salt water, humidity, and UV light without corroding, warping, or fading. These sheets are more rigid than standard HDPE, so they can handle structural applications such as docks, boat components, and work platforms. Their coarse texture hides everyday scuffs and scratches and provides traction in wet environments. Also known as starboard.

	Wd.	Lg.	Fabrication	Min. Temp.	Max. Temp., ° F	Flammability Rating	Choose a Color		Each
3/16" Thick (-0.009" to 0.009" Tolerance)



		6"	6"	Extruded	Not Rated	180	UL 94 HB	Black, White	9785T832	00000


		12"	12"	Extruded	Not Rated	180	UL 94 HB	Black, White	9785T804	0000
		24"	24"	Extruded	Not Rated	180	UL 94 HB	Black, White	9785T809	00000
		24"	48"	Extruded	Not Rated	180	UL 94 HB	Black, White	9785T814	00000
		48"	48"	Extruded	Not Rated	180	UL 94 HB	Black, White	9785T822	00000
		48"	96"	Extruded	Not Rated	180	UL 94 HB	Black, White	9785T827	000000


		1/4" Thick (-0.013" to 0.013" Tolerance)



				6"	6"	Extruded	Not Rated	180	UL 94 HB	Black, White	9785T831	0000


				12"	12"	Extruded	Not Rated	180	UL 94 HB	Black, White, Blue, Beige, Green, Orange, Red, Yellow	9785T803	00000
				24"	24"	Extruded	Not Rated	180	UL 94 HB	Black, White, Blue, Beige, Green, Orange, Red, Yellow	9785T808	00000
				24"	48"	Extruded	Not Rated	180	UL 94 HB	Black, White, Blue, Beige, Green, Orange, Red, Yellow	9785T813	00000
				36"	36"	Extruded	Not Rated	180	UL 94 HB	Black, White, Blue, Beige, Green, Orange, Red	9785T817	00000
				48"	48"	Extruded	Not Rated	180	UL 94 HB	Black, White, Blue, Orange, Red, Yellow	9785T821	000000
				48"	96"	Extruded	Not Rated	180	UL 94 HB	Black, White, Blue, Beige, Green, Orange, Red, Yellow	9785T826	000000


				1/2" Thick (-0.025" to 0.025" Tolerance)



						6"	6"	Extruded	Not Rated	180	UL 94 HB	Black, White, Blue, Beige, Green, Orange, Red, Yellow	9785T83	0000


						12"	12"	Extruded	Not Rated	180	UL 94 HB	Black, White, Blue, Beige, Green, Orange, Red, Yellow	9785T802	00000
						24"	24"	Extruded	Not Rated	180	UL 94 HB	Black, White, Blue, Beige, Green, Orange, Red, Yellow	9785T807	00000
						24"	48"	Extruded	Not Rated	180	UL 94 HB	Black, White, Blue, Beige, Green, Orange, Red, Yellow	9785T812	000000
						36"	36"	Extruded	Not Rated	180	UL 94 HB	Black, White, Blue, Beige, Green, Yellow	9785T816	000000
						48"	48"	Extruded	Not Rated	180	UL 94 HB	Black, White, Blue, Beige, Red	9785T82	000000
						48"	96"	Extruded	Not Rated	180	UL 94 HB	Black, White, Blue, Beige, Green, Red, Yellow	9785T825	000000


						3/4" Thick (-0.038" to 0.038" Tolerance)



								6"	6"	Extruded	Not Rated	180	UL 94 HB	Black, White, Blue, Orange, Red, Yellow	9785T833	0000


								12"	12"	Extruded	Not Rated	180	UL 94 HB	Black, White, Blue, Beige, Green, Orange, Red, Yellow	9785T805	00000
								24"	24"	Extruded	Not Rated	180	UL 94 HB	Black, White, Blue, Yellow	9785T81	00000
								24"	48"	Extruded	Not Rated	180	UL 94 HB	Black, White, Beige, Green, Red, Yellow	9785T815	000000
								36"	36"	Extruded	Not Rated	180	UL 94 HB	Black, White, Blue, Beige	9785T818	000000
								48"	48"	Extruded	Not Rated	180	UL 94 HB	Black, White, Beige, Red, Yellow	9785T823	000000
								48"	96"	Extruded	Not Rated	180	UL 94 HB	Black, White, Blue, Beige, Yellow	9785T828	000000


								1" Thick (-0.05" to 0.05" Tolerance)



										6"	6"	Extruded	Not Rated	180	UL 94 HB	Black, White	9785T829	00000


12"	12"									Extruded	Not Rated	180	UL 94 HB	Black, White	9785T801	00000
24"	24"									Extruded	Not Rated	180	UL 94 HB	Black, White	9785T806	000000
24"	48"									Extruded	Not Rated	180	UL 94 HB	Black, White	9785T811	000000
48"	48"									Extruded	Not Rated	180	UL 94 HB	Black, White	9785T819	000000
48"	96"									Extruded	Not Rated	180	UL 94 HB	Black, White	9785T824	000000

Recycled Marine-Grade HDPE Sheets

Made of recycled HDPE plastic, these sheets are more sustainable and economical than standard marine-grade moisture-resistant HDPE sheets. They won’t absorb moisture or swell when exposed to humidity. They also won’t degrade in salt water. However, their properties have more variance and broader ranges than material that is not recycled. Because these sheets have a low carbon footprint, they can help you meet criteria for sustainability certifications, such as LEED and Envision, or comply with company environmental initiatives.

Rough Texture—The rough texture masks scratches, scuffs, and fingerprints.

	Lg.	Fabrication	Max. Temp., ° F	Color	Certificate Type		Each
Smooth Texture







			1" Thick (-0.05" to 0.05" Tolerance)

			6"	6"	Extruded	180	Black	—	3762N135	000000


			12"	12"	Extruded	180	Black	—	3762N136	00000
			24"	24"	Extruded	180	Black	—	3762N137	000000
			36"	36"	Extruded	180	Black	—	3762N139	000000
			48"	24"	Extruded	180	Black	—	3762N138	000000
			48"	48"	Extruded	180	Black	Material Certificate	3762N141	000000
			96"	48"	Extruded	180	Black	Material Certificate	3762N142	000000


			Rough Texture







							3/16" Thick (-0.009" to 0.009" Tolerance)

							24"	24"	Extruded	180	Black	Material Certificate	3762N111	00000


							36"	36"	Extruded	180	Black	—	3762N113	00000
							48"	24"	Extruded	180	Black	—	3762N112	00000
							48"	48"	Extruded	180	Black	—	3762N114	00000
							96"	48"	Extruded	180	Black	Material Certificate	3762N115	00000




									1/4" Thick (-0.013" to 0.013" Tolerance)

									24"	24"	Extruded	180	Black	—	3762N116	00000


									36"	36"	Extruded	180	Black	—	3762N118	00000
									48"	24"	Extruded	180	Black	—	3762N117	00000
									48"	48"	Extruded	180	Black	—	3762N119	00000
									96"	48"	Extruded	180	Black	Material Certificate	3762N121	000000




											1/2" Thick (-0.025" to 0.025" Tolerance)

											24"	24"	Extruded	180	Black	—	3762N122	00000


											36"	36"	Extruded	180	Black	Material Certificate	3762N124	000000
											48"	24"	Extruded	180	Black	—	3762N123	00000
											48"	48"	Extruded	180	Black	Material Certificate	3762N125	000000
											96"	48"	Extruded	180	Black	Material Certificate	3762N126	000000




											3/4" Thick (-0.038" to 0.038" Tolerance)

	6"										6"	Extruded	180	Black	—	3762N127	00000


	12"	12"									Extruded	180	Black	—	3762N128	00000
	24"	24"									Extruded	180	Black	—	3762N129	00000
	36"	36"									Extruded	180	Black	—	3762N132	000000
	48"	24"									Extruded	180	Black	—	3762N131	000000
	48"	48"									Extruded	180	Black	—	3762N133	000000
	96"	48"									Extruded	180	Black	Material Certificate	3762N134	000000

Synthetic Wood

Get the look of wood without having to worry about splintering or rotting. This UV-resistant synthetic wood can be used in direct sunlight and high-traffic applications, such as marine decking.

						6 ft. Long		12 ft. Long
	Thk.	Thk. Tolerance	Wd.	Color	Max. Temp., ° F		Each		Each
HDPE Synthetic Wood



		1/2"	-0.100" to 0.100"	8"	Brown	120	8506K38	000000	———	0


		3/4"	-0.100" to 0.100"	5 1/2"	Brown	120	8506K34	00000	8506K431	000000
		3/4"	-0.100" to 0.100"	5 1/2"	White	120	8506K432	00000	———	0
		7/8"	-0.100" to 0.100"	2 1/8"	Brown	120	8506K41	00000	———	0
		1 1/2"	-0.100" to 0.100"	3 1/2"	Brown	120	8506K36	00000	8506K438	00000
		1 1/2"	-0.100" to 0.100"	3 1/2"	White	120	8506K439	00000	———	0
		1 1/2"	-0.100" to 0.100"	5 1/2"	Brown	120	8506K37	00000	8506K44	000000
		1 1/2"	-0.100" to 0.100"	5 1/2"	Light Gray	120	8506K441	00000	———	0
		1 1/2"	-0.100" to 0.100"	7 1/2"	Brown	120	8506K43	000000	———	0
		1 1/2"	-0.100" to 0.100"	9 1/2"	Brown	120	8506K442	000000	8506K443	000000
		1 1/2"	-0.100" to 0.100"	9 1/2"	White	120	8506K444	000000	———	0

Marine-Grade HDPE Bars

Withstand salt water, humidity, and UV light without corroding, warping, or fading. These bars are more rigid than standard HDPE, so they can handle structural applications such as docks, boat components, and work platforms. Their coarse texture hides everyday scuffs and scratches and provides traction in wet environments. Also known as starboard.

	Wd.	Lg., ft.	Fabrication	Min. Temp.	Max. Temp., ° F	Flammability Rating	Choose a Color		Each
3/16" Thick (-0.009" to 0.009" Tolerance)



		1"	4	Extruded	Not Rated	180	UL 94 HB	Black, White	6644N11	00000


		2"	4	Extruded	Not Rated	180	UL 94 HB	Black, White	6644N12	0000
		3"	4	Extruded	Not Rated	180	UL 94 HB	Black, White	6644N13	0000
		4"	4	Extruded	Not Rated	180	UL 94 HB	Black, White	6644N14	00000


		1/4" Thick (-0.013" to 0.013" Tolerance)



				1"	4	Extruded	Not Rated	180	UL 94 HB	Black, White	6644N15	0000


				2"	4	Extruded	Not Rated	180	UL 94 HB	Black, White	6644N16	0000
				3"	4	Extruded	Not Rated	180	UL 94 HB	Black, White	6644N17	00000
				4"	4	Extruded	Not Rated	180	UL 94 HB	Black, White	6644N18	00000


				1/2" Thick (-0.025" to 0.025" Tolerance)



						1"	4	Extruded	Not Rated	180	UL 94 HB	Black, White	6644N19	0000


						2"	4	Extruded	Not Rated	180	UL 94 HB	Black, White	6644N21	00000
						3"	4	Extruded	Not Rated	180	UL 94 HB	Black, White	6644N22	00000
						4"	4	Extruded	Not Rated	180	UL 94 HB	Black, White	6644N23	00000


						3/4" Thick (-0.038" to 0.038" Tolerance)



								1"	1	Extruded	Not Rated	180	UL 94 HB	Black, White	6644N24	0000


								1"	2	Extruded	Not Rated	180	UL 94 HB	Black, White	6644N25	0000
								1"	4	Extruded	Not Rated	180	UL 94 HB	Black, White	6644N26	00000
								2"	1	Extruded	Not Rated	180	UL 94 HB	Black, White	6644N27	0000
								2"	2	Extruded	Not Rated	180	UL 94 HB	Black, White	6644N28	00000
								2"	4	Extruded	Not Rated	180	UL 94 HB	Black, White	6644N29	00000
								3"	1	Extruded	Not Rated	180	UL 94 HB	Black, White	6644N31	00000
								3"	2	Extruded	Not Rated	180	UL 94 HB	Black, White	6644N32	00000
								3"	4	Extruded	Not Rated	180	UL 94 HB	Black, White	6644N33	00000
								4"	1	Extruded	Not Rated	180	UL 94 HB	Black, White	6644N34	00000
								4"	2	Extruded	Not Rated	180	UL 94 HB	Black, White	6644N35	00000


								4"	4	Extruded	Not Rated	180	UL 94 HB	Black, White	6644N36	00000


								1" Thick (-0.05" to 0.05" Tolerance)



										1"	1	Extruded	Not Rated	180	UL 94 HB	Black, White	6644N37	0000


1"										2	Extruded	Not Rated	180	UL 94 HB	Black, White	6644N38	0000
1"	4									Extruded	Not Rated	180	UL 94 HB	Black, White	6644N39	00000
2"	1									Extruded	Not Rated	180	UL 94 HB	Black, White	6644N41	0000
2"	2									Extruded	Not Rated	180	UL 94 HB	Black, White	6644N42	00000
2"	4									Extruded	Not Rated	180	UL 94 HB	Black, White	6644N43	00000
3"	1									Extruded	Not Rated	180	UL 94 HB	Black, White	6644N44	00000
3"	2									Extruded	Not Rated	180	UL 94 HB	Black, White	6644N45	00000
3"	4									Extruded	Not Rated	180	UL 94 HB	Black, White	6644N46	00000
4"	1									Extruded	Not Rated	180	UL 94 HB	Black, White	6644N47	00000
4"	2									Extruded	Not Rated	180	UL 94 HB	Black, White	6644N48	00000


4"	4	Extruded								Not Rated	180	UL 94 HB	Black, White	6644N49	00000

Plywood Sheets

Made of thin layers of wood glued together under heat and pressure, plywood sheets are durable, yet lightweight. The direction of the wood grain alternates with each layer—known as opposing grain—making these sheets strong enough for building ramps and shelves or repairing holes in floors and ceilings. Opposing grains also limit movement, keeping each layer from expanding or contracting too much—otherwise moisture could warp and split these sheets apart. All are made of real wood, so you can drill, saw, sand, paint, and stain them.

Marine Plywood—Marine-grade plywood sheets meet BS 1088, an international standard for plywood made from water- and fungus-resistant hardwood. Often used to make boats, their layers are bonded with waterproof glue, so they won’t bubble, buckle, or delaminate with long-term exposure to weather and water. Boiling temperatures and steam aren’t a problem either. Compared to CDX plywood sheets with the same thickness, these sheets have thinner layers and more of them, making this plywood stronger and denser. Each layer is made from one piece of wood, so there are no gaps in the middle layers that could weaken the sheet or leave a rough edge when you cut or sand it. The outer layers have a finished appearance that doesn’t need to be painted.

3/4" Thick—For load-bearing applications, use ¾"-thick sheets.

			12" × 12"		12" × 24"		24" × 24"		24" × 36"		24" × 48"		36" × 48"		48" × 48"		48" × 96"
	Thk.	Thk. Tolerance		Each		Each		Each		Each		Each		Each		Each		Each
Marine Plywood



		1/4"	-0.040" to 0.016"	1125T411	000000	1125T412	000000	1125T413	000000	1125T414	000000	1125T415	000000	1125T416	000000	1125T417	0000000	1125T418	0000000


		3/8"	-0.050" to 0.016"	1125T21	00000	1125T22	00000	1125T23	00000	1125T24	00000	———	0	1125T25	00000	———	0	———	0
		1/2"	-0.065" to 0.020"	1125T31	00000	1125T32	00000	1125T33	00000	1125T34	00000	1125T426	00000	1125T35	000000	1125T427	000000	1125T428	000000
		3/4"	-0.080" to 0.028"	1125T41	00000	1125T42	00000	1125T43	00000	1125T44	00000	1125T429	000000	1125T45	000000	1125T431	000000	1125T432	000000
		1"	-0.065" to 0.035"	1125T419	00000	1125T421	00000	1125T422	00000	1125T423	000000	1125T424	000000	1125T425	000000	———	0	———	0