U-Channel Fiberglass | McMaster-Carr

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Shape

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Outside Width

Inside Width

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Outside Height

Length

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Color

Flexibility

Performance

Highly Electrically Insulating

Ultra Impact Resistant

Inside Height

For Use Outdoors

Inside Corner Shape

Outside Corner Shape

Leg Edge Shape

Maximum Temperature

Hardness Rating

Flexural Strength

10,000 psi to 30,000 psi

23,200 psi to 31,000 psi

RoHS

Compliant

Impact Strength

4 ft·lbf/in to 25 ft·lbf/in

8.2 ft·lbf/in to 12 ft·lbf/in

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

Yes

REACH

Compliant

DFARS Specialty Metals

Exempt

Export Control Classification Number (ECCN)

Minimum Temperature

38 Products

About Composites

Compare our offering of composites to find the right material for you.

Arc-Resistant GPO3 Fiberglass U-Channels

These GPO3 fiberglass U-channels are often used for electrical applications in humid environments. They are arc and track resistant, plus they have better electrical insulation properties than FRP fiberglass. Made of fiberglass-reinforced polyester, they're also called polyester-grade industrial laminate.

	Outside				Inside									3 ft. Long		5 ft. Long		6 ft. Long
	Wd.	Wd. Tolerance	Ht.	Ht. Tolerance	Wd.	Ht.	Straightness Tolerance	Color	Temp. Range, ° F	Tensile Strength, psi	Impact Strength, ft·lbf/in	Hardness	For Use Outdoors		Each		Each		Each
UL 94 V-0







				1/16" Thick Wall (-0.015" to 0.015")

				2 3/16"	-0.062" to 0.062"	3/4"	-0.062" to 0.062"	1 3/4"	11/16"	0.050"/1 ft.	Red	-50 to 265	10,000 to 15,000	8.2 to 12	Rockwell M95 (Hard)	No	———	0	8523K311	000000	———	0




						1/8" Thick Wall (-0.025" to 0.025")

						2 9/16"	-0.063" to 0.063"	1 7/32"	-0.032" to 0.032"	2 5/16"	1 3/32"	0.050"/1 ft.	Red	—	10,000 to 15,000	8.2 to 12	Barcol 50 (Hard)	No	8523K11	000000	———	0	8523K21	000000




								1/8" Thick Wall (-0.02" to 0.02")

								2"	-0.062" to 0.062"	9/16"	-0.062" to 0.062"	1 3/4"	7/16"	0.050"/1 ft.	Red	-50 to 265	10,000 to 15,000	8.2 to 12	Rockwell M95 (Hard)	No	———	0	8523K32	00000	———	0


								2"	-0.062" to 0.062"	13/16"	-0.062" to 0.062"	1 3/4"	11/16"	0.050"/1 ft.	Red	-50 to 265	10,000 to 15,000	8.2 to 12	Rockwell M95 (Hard)	No	———	0	8523K331	00000	———	0
								2 5/16"	-0.062" to 0.062"	3/4"	-0.062" to 0.062"	2 1/16"	5/8"	0.050"/1 ft.	Red	-50 to 265	10,000 to 15,000	8.2 to 12	Rockwell M95 (Hard)	No	———	0	8523K341	00000	———	0
								3 19/32"	-0.062" to 0.062"	1 1/8"	-0.062" to 0.062"	3 11/32"	1"	0.050"/1 ft.	Red	-50 to 265	10,000 to 15,000	8.2 to 12	Rockwell M95 (Hard)	No	———	0	8523K351	00000	———	0
								4 1/2"	-0.062" to 0.062"	2 1/2"	-0.062" to 0.062"	4 1/4"	2 3/8"	0.050"/1 ft.	Red	-50 to 265	10,000 to 15,000	8.2 to 12	Rockwell M95 (Hard)	No	———	0	8523K361	00000	———	0
								9 21/32"	-0.062" to 0.062"	1 5/8"	-0.062" to 0.062"	9 13/32"	1 1/2"	0.050"/1 ft.	Red	-50 to 265	10,000 to 15,000	8.2 to 12	Rockwell M95 (Hard)	No	———	0	8523K371	000000	———	0




										5/32" Thick Wall (-0.02" to 0.02")

										5 1/2"	-0.062" to 0.062"	1 1/4"	-0.062" to 0.062"	5 3/16"	1 3/32"	0.050"/1 ft.	Red	-50 to 265	10,000 to 15,000	8.2 to 12	Rockwell M95 (Hard)	No	———	0	8523K38	00000	———	0




												3/16" Thick Wall (-0.025" to 0.025")

												3 9/16"	-0.063" to 0.063"	2 9/16"	-0.032" to 0.032"	3 3/16"	2 3/8"	0.050"/1 ft.	Red	—	10,000 to 15,000	8.2 to 12	Barcol 50 (Hard)	No	8523K12	00000	———	0	8523K22	00000


												4 3/4"	-0.063" to 0.063"	1 5/8"	-0.032" to 0.032"	4 3/8"	1 7/16"	0.050"/1 ft.	Red	—	10,000 to 15,000	8.2 to 12	Barcol 50 (Hard)	No	8523K14	00000	———	0	8523K24	00000




														3/16" Thick Wall (-0.02" to 0.02")

														4"	-0.062" to 0.062"	1 3/8"	-0.062" to 0.062"	3 5/8"	1 3/16"	0.050"/1 ft.	Red	-50 to 265	10,000 to 15,000	8.2 to 12	Rockwell M95 (Hard)	No	———	0	8523K39	00000	———	0


														8 1/2"	-0.062" to 0.062"	2 11/16"	-0.062" to 0.062"	8 1/8"	2 1/2"	0.050"/1 ft.	Red	-50 to 265	10,000 to 15,000	8.2 to 12	Rockwell M95 (Hard)	No	———	0	8523K41	000000	———	0




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

6 1/2"																-0.040" to 0.040"	2 3/4"	-0.020" to 0.020"	6"	2 1/2"	0.050"/1 ft.	Red	—	10,000 to 15,000	8.2 to 12	Barcol 50 (Hard)	No	8523K16	00000	———	0	8523K26	000000




		1/4" Thick Wall (-0.02" to 0.02")

		2"	-0.062" to 0.062"													1"	-0.062" to 0.062"	1 1/2"	3/4"	0.050"/1 ft.	Red	-50 to 265	10,000 to 15,000	8.2 to 12	Rockwell M95 (Hard)	No	———	0	8523K42	00000	———	0


		3"	-0.062" to 0.062"													7/8"	-0.062" to 0.062"	2 1/2"	5/8"	0.050"/1 ft.	Red	-50 to 265	10,000 to 15,000	8.2 to 12	Rockwell M95 (Hard)	No	———	0	8523K43	00000	———	0
		3"	-0.062" to 0.062"													1 1/2"	-0.062" to 0.062"	2 1/2"	1 1/4"	0.050"/1 ft.	Red	-50 to 265	10,000 to 15,000	8.2 to 12	Rockwell M95 (Hard)	No	———	0	8523K44	00000	———	0
		4"	-0.062" to 0.062"													1 1/8"	-0.062" to 0.062"	3 1/2"	7/8"	0.050"/1 ft.	Red	-50 to 265	10,000 to 15,000	8.2 to 12	Rockwell M95 (Hard)	No	———	0	8523K45	000000	———	0
		4 1/2"	-0.062" to 0.062"	2 1/2"												-0.062" to 0.062"	4"	2 1/4"	0.050"/1 ft.	Red	-50 to 265	10,000 to 15,000	8.2 to 12	Rockwell M95 (Hard)	No	———	0	8523K46	000000	———	0




				3/8" Thick Wall (-0.02" to 0.02")

				11 9/32"	-0.062" to 0.062"											1 5/8"	-0.032" to 0.032"	10 17/32"	1 1/4"	0.050"/1 ft.	Red	-50 to 265	10,000 to 15,000	8.2 to 12	Rockwell M95 (Hard)	No	———	0	8523K47	000000	———	0

Structural FRP Fiberglass U-Channels

Made of fiberglass-reinforced polyester, these FRP fiberglass U-channels are an alternative to wood in structural applications. They are strong and lightweight.

Outside				Inside									5 ft. Long		10 ft. Long
Wd.	Wd. Tolerance	Ht.	Ht. Tolerance	Wd.	Ht.	Straightness Tolerance	Color	Temp. Range, ° F	Tensile Strength, psi	Impact Strength, ft·lbf/in	Hardness	For Use Outdoors		Each		Each







			1/8" Thick Wall (-0.013" to 0.013")

			2"	-0.094" to 0.094"	9/16"	-0.094" to 0.094"	1 3/4"	7/16"	0.050"/1 ft.	Green	-60 to 140	7,000 to 30,000	4 to 25	Barcol 45 (Hard)	Yes	8529K61	000000	8529K21	000000




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

					3 1/2"	-0.094" to 0.094"	1 1/2"	-0.094" to 0.094"	3 1/8"	1 5/16"	0.050"/1 ft.	Green	-60 to 140	7,000 to 30,000	4 to 25	Barcol 45 (Hard)	Yes	8529K41	00000	8529K51	000000




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

							3"	-0.094" to 0.094"	7/8"	-0.094" to 0.094"	2 1/2"	5/8"	0.050"/1 ft.	Green	-60 to 140	7,000 to 30,000	4 to 25	Barcol 45 (Hard)	Yes	8529K62	00000	8529K22	00000


							3"	-0.094" to 0.094"	1"	-0.094" to 0.094"	2 1/2"	3/4"	0.050"/1 ft.	Green	-60 to 140	7,000 to 30,000	4 to 25	Barcol 45 (Hard)	Yes	8529K11	00000	8529K31	00000
							4"	-0.094" to 0.094"	1 1/8"	-0.094" to 0.094"	3 1/2"	7/8"	0.050"/1 ft.	Green	-60 to 140	7,000 to 30,000	4 to 25	Barcol 45 (Hard)	Yes	8529K63	00000	8529K23	000000
							6"	-0.094" to 0.094"	1 5/8"	-0.094" to 0.094"	5 1/2"	1 3/8"	0.050"/1 ft.	Green	-60 to 140	7,000 to 30,000	4 to 25	Barcol 45 (Hard)	Yes	8529K65	00000	8529K25	000000
							8"	-0.094" to 0.094"	2 3/16"	-0.094" to 0.094"	7 1/2"	1 15/16"	0.050"/1 ft.	Green	-60 to 140	7,000 to 30,000	4 to 25	Barcol 45 (Hard)	Yes	8529K45	000000	8529K55	000000