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Formex™ GL Electrical Insulation Material

Offers unmatched versatility and performance

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Formex™ GL is the newest formulation of flame retardant polypropylene electrical insulation material from ITW Formex^®. Available in 0.017 inch and 0.010 inch thicknesses, Formex™ GL shares the same exceptional reliability and durability as its Formex™ GK counterparts while offering further enhanced temperature rating. Formex™ GL provides a viable alternative to Formex™ GK when applications require a thinner gauge material that offers superior temperature tolerance.

Manufacturing Specification
Mechanical Properties
Physical Properties
Electrical Properties
Packaging Information

	GL-10	GL-17
Color	Natural & Black	Natural & Black
Thickness (in)	0.010 (+0.003/-0.0015)	0.017 (+0.003/-0.001)
Thickness (mm)	0.25 (+0.08/-0.04)	.25 (+0.08/-0.03)

	Test Method	GL-10	GL-17
Tensile Yield - psi	ASTM D-882 / ISO 527-1,-2
Machine Direction		5,000	4,300
Transverse Direction		2,900	3,100

	Test Method	GL-10	GL-17
Density - gm/cc	ASTM D-792 / ISO 1183-1, Method A	0.972	0.972
Flammability	UL 94	VTM-0	V-0
Oxygen Index - %	ASTM D-2863 / ISO 4589--1,-2	29	29
Water Absorption - % change in weight	ASTM D-570 / ISO 62, Method 4	0.06%	0.06%
Heat Deflection Temperature at 66 psi	ASTM D-648 0.45MPa / ISO 75-1,-2, Method B	122°C / 252°F	122°C / 252°F
Relative Temperature Index	UL 746B
Electrical		125°C / 257°F	125°C / 257°F
Mechanical Without Impact		115°C / 239°F	115°C / 239°F
Surface Energy - dynes/cm (as produced)	ASTM D-2578	≥50	≥50

	Test Method	GL-10	GL-17
Comparative Tracking Index - volts	IEC 60112	600	600
Dielectric Breakdown - volts	ASTM D-149 / IEC 60243-1	18,799	20,837
Dielectric Strength - volts/mil	ASTM D-149 / IEC 60243-1	1,880	1,226
Volume Resistivity - ohm-cm	ASTM D-257 / IEC 62631-1-1	1x10¹⁶	1x10¹⁶
Dielectric Constant	ASTM D-150 / IEC 60250, 1MHz	1.8	1.8
Dissipation Factor	ASTM D-150 / IEC 60250, 1MHz	0.0017	0.0017

	GL-10	GL-17
Standard Configuration	Roll	Roll
Core ID - inches (millimeters)	6 (152)	6 (152)
Roll OD - inches (millimeters) (approximate)	18 (457)	18 (457)
Roll Width - inches (millimeters)	24 (610)	24 (610)
Roll Weight - lbs (kgs) (approximate)	192 (87)	192 (87)
Length/Roll - feet (meters)	2,000 (609.6)	1,000 (304.8)
Area/Roll (sq ft)	4,000 (371.6)	2,000 (185.8)

For a complete listing of Formex products, contact your Formex sales representative.

Product Availability and Technical Specifications

Formex™ GL is currently available in rolls. Our experienced engineers can help you design Formex™ GL electrical insulation material into a wide variety of shapes to meet your unique requirements.

Product Features:

UL 94V-0 Flame Class Rating
H₂0 Absorption 0.06%
Temperature Rating 125C
Dielectric Strength 1,880 Volts/mil @ 0.010"
UL Recognized File E121855