G7

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SmithLamina materials are glass based laminates with a silicone resin binder. Glass silicone insulating materials offer excellent thermal resistance (up to 250�C) and arc resistance. These grades find application as electric furnace insulation, circuit breaker parts, switchboard panels, and arc barriers and also available in tubing

n fabrication, care must be taken due to the low internal bond strengths inherent in silicone resins. It exhibits excellent electrical properties, excellent heat resistance, outstanding arc resistance, and Self-extinguishing properties.

The main applications are Class H Transformers, Arc Plates, Terminal Boards, Microwave radar insulation, Spacers, wedges and all H class applications.

Key Characteristics :-

• Grade: NEMA LI-1 Grade FR4 / IEC 60893 EPGC 202 / Hgw 2372.1 / EP-4
• Grade: NEMA LI-1 Grade G7 / IEC 60893 SI GC 202 / Hgw 2572
• Standard Colour: White
• Specific Density: 1.80 - 2.00 Gm/cm3

Technical Data :-

Key Characteristics	Units	Typical Values
Rockwell Hardness (.062”)	M Scale	100
Moisture Absorption (.062”)	%	0.19
Flexural Strength (.25”) CW- LW-	psi (MPa)	15000 (103) 18000(124)
IZOD Impact Strength CW- LW -	ft.-lbs./in.	8.5 17.0
Arc Resistance (.125”)	Seconds	200
Compressive Strength, Flat-wise	psi (MPa)	45,000 (310)
Flammability Rating	Class	V-0
Breakdown Voltage (.062) (Both Parallel Step Method)	kV	55
Dielectric Strength	V/mil.	350
Permittivity (.062”)	-	4.34
Dissipation Factor (.062”)	-	0.0017

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