All grades of Polyply industrial sheet are produced using polyester
resin and fiberglass reinforcement. They are U.L. recognized and are
available in 36"x72" and 48"x96" sheet. Sheets are manufactured in
thicknesses ranging from 1/32" to 2" with most sizes in stock for
immediate shipment.

Polyply L-45. Low-cost, general purpose laminate which meets
or exceeds NEMA GPO-1 requirements.
Polyply L-40. Low cost, general purpose flame retardant electrical
laminate which meets or exceeds NEMA GPO-2 requirements.
Polyply L-50. Track resistant, flame retardant laminate which meets
or exceeds NEMA GPO-3 requirements.

 

 

TYPICAL PROPERTIES

General Information	Unit	ASTM/UL TEST NO.	Typical	Average	Values
Polply Grade			L45	L40	L50
NEMA Grade			GPO-1	GPO-2	GPO-3
Color			Tan	Red	Red
U.L. Recognized File Number			E82624	E82624	E82624
Mechanical Properties
Tensile Strength	psi	D638	10,400	9,800	10,000
Flexural Strength	psi	D790	25,000	22,000	23,200
Compressive Strength	psi	D695	34,000	32,000	32,800
Flexural Modules	psi x 106	D790	1.26	1.20	1.23
Shear Strength	psi	D732	14,500	14,000	14,000
Izod Impact Strength (notched)	ft-lb/in	D256	8.4	8.0	8.2
Water Absorption	% by weight	D570	0.36	0.23	0.21
Barcol hardness		D2583	50	50	50
Specific Properties		D792	1.8	1.8	1.8
Electric Properties
Dielectric Strength (- in oil)	volts/mil	D149	380	415	400
Dielectric Strength (Parallel in oil)	kV	D149	52	61	57
High Voltage Arc Resistance	sec	D495	200+	200+	200+
Dielectric Constant @ 60 Hz		D150	4.8	4.6	4.8
Dielectric Constant @ M Hz		D150	4.6	4.5	4.7
Dissipation Factor @ 60 Hz		D150	.013	.014	.013
Dissipation Factor @ M Hz		D150	.011	.012	.011
Comparative Tracking Index	volts	D3638	500+	500+	500+
Flame Resistance Properties
U.L. Subject 94		UL94	94HB	94VO	94VO
Thermal Properties
Coefficient of Thermal Expansion	in/in/C x 10-5	D696	2.0	2.0	2.0
Thermal Conductivity	btu/hr/ft2/in/F	C177	1.8	1.8	1.9
U.L. Temperature Index-Electrical	C	UL746B	105	130	120
U.L. Temperature Index-Mechanical	C	UL746B	160	160	140