Glass Epoxy Laminate STEF-1

The glass-reinforced laminate electrotechnical STEF-1 differs by high mechanical strength at moderate teperature and high stability of electrical properties at boosted damp.

Conformity to standards

GОSТ 12652-74

IEC 249	EP-GC203 893-3-2
DIN 7735	Hgw 2372

Technical Characteristics

			STEF-1
Parameters	Test conditions	Guarant. values	Typical values
Density, kg/m3		1600-1900	1600-1900
breakdown voltage parallel to lamination (1 min) not less than		350	350
Breaking stress at alongation, not less than		220	220
Dissipation Factor at 1MHz	D - 24/23	0,04	0,04
Charpy impact strenght parallel to lamination on notched sample	D - 24/23	50	50
insulation resistance,Mom	Е - 24/125	5 x 10⁴	5 x 10⁴
Volume resistivity (<8mm)	Е - 24/125	1,0 x 10⁵	1,0 x 10⁵
breakdown voltage parallel to lamination (1 min) not less than	М90/ transf.oil	35	35
Sheet sizes, mm		1010х890, 1220х1020	1010х890, 1220х1020
Thickness, mm		0,5-50,0	0,5-50,0
Identification symbol

Application

STEF-1 Is intended for use as insulant interleafs of substrates and details of express assignment at the temperature of from -60 up to 105 С. It apply in electrical machines by the way of wedges for isolation of windings of machines alternating-current, rotor windings of generators and drives, and also anchor windings of machines of a direct current