China Factory Supply Electrical Insulating Sheet - D370 SMC Molded insulation sheet – D&F manufacturers and Exporter

Factory Supply Electrical Insulating Sheet - D370 SMC Molded insulation sheet – D&F

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Factory Supply Electrical Insulating Sheet - D370 SMC Molded insulation sheet – D&F Detail:

D370 SMC molded insulation sheet (D&F type number:DF370) is a kind of thermosetting rigid insulation sheet. It is made from SMC in mold under high temperature and high pressure. It is with UL certification and passed the test of REACH and RoHS, etc. It is also called as SMC sheet, SMC insulation board,etc.

SMC is a kind of sheet molding compound which consists of glass fiber reinforced with unsaturated polyester resin, filled with fire retardant and other filling substance.

SMC sheets have higher mechanical strength, dielectric strength, good flame resistance, tracking resistance, arc resistance and higher withstand voltage, as well as low water absorption, stable dimension tolerance and small bending deflection. SMC sheets are used for making all kinds of insulating boards in high or low voltage switch gears. It can also be used to process other insulation structural parts.

Thickness:2.0mm~60mm

Sheet size:580mm*850mm, 1000mm*2000mm,1300mm*2000mm, 1500mm*2000mm or other negotiated sizes

SMC (1)

SMC

SMC (2)

DMC

SMC SHEET

SMC sheets With different color

SMC (4)

SMC sheets

Technical Requirements

Appearance

Its surface shall be flat and smooth, free from blisters, dents and obvious mechanical damages. The colour of its surface should be uniform, free from obvious exposed fiber. Free from obvious contamination, impurities and obvious holes. Free from delamination and crackles at its edges. If there are defects on the surface of the product, they can be patched. The superabundant ashes must be cleaned.

The bending deflection Unit: mm

Spec	Dimension of shape	Nominal thickness S	Bending deflection	Nominal thickness S	Bending deflection	Nominal thickness S	Bending deflection
D370 SMC sheet	Length of all sides ≤500	3≤S＜5	≤8	5≤S＜10	≤5	≥10	≤4
	Length of any side	3≤S＜5	≤12	5≤S＜10	≤8	≥10	≤6

	500 to 1000
	Length of any side ≥1000	3≤S＜5	≤20	5≤S＜10	≤15	≥10	≤10

Performance requirements

Physical, mechanical and electrical properties for SMC sheets

Properties			Unit	Standard value	Typical value	Test method
Density			g/cm3	1.65—1.95	1.79	GB/T1033.1-2008
Barcol hardness			-	≥ 55	60	ASTM D2583-07
Water absorption, 3mm thickness			%	≤0.2	0.13	GB/T1034-2008
Flexural strength,perpendicular to laminations		Lengthwise	MPa	≥170	243	GB/T1449-2005
Flexural strength,perpendicular to laminations		Crosswise	MPa	≥150	240	GB/T1449-2005
Impact Strength, parallel to laminations(Charpy, unnotched)			KJ/m²	≥60	165	GB/T1447-2005
Tensile strength			MPa	≥55	143	GB/T1447-2005
Tensile elasticity modulus			MPa	≥9000	1.48 x 10⁴	GB/T1447-2005
Moulding shrinkage			%	-	0.07	ISO2577:2007
Compressive strength(perpendicular to laminations)			MPa	≥ 150	195	GB/T1448-2005
Compressive modulus			MPa	-	8300	GB/T1448-2005
Heat deflection temperature under load(T_ff1.8)			℃	≥190	＞240	GB/T1634.2-2004
Coefficient of liner thermal expansion(20℃–40℃)			10-6/K	≤18	16	ISO11359-2-1999
Electrical strength (in 25# transformer oil at 23℃+/-2℃,short-time test, Φ25mm/Φ75mm, cylindrical electrode )			KV/mm	≥12	15.3	GB/T1408.1-2006
Breakdown voltage ( parallel to laminations, in 25# transformer oil at 23℃+/-2℃, 20s step-by -step test, Φ130mm/Φ130mm, plate electrode )			KV	≥25	＞100	GB/T1408.1-2006
Volume resistivity			Ω.m	≥1.0 x 10¹²	3.9 x 10¹²	GB/T1408.1-2006
Surface resistivity			Ω	≥1.0 x 10¹²	2.6 x 10¹²	GB/T1408.1-2006
Relative permittivity （1MHz）			-	≤ 4.8	4.54	GB/T1409-2006
Dielectric dissipation factor （1MHz）			-	≤ 0.06	9.05 x 10^-3	GB/T1409-2006
Arc Resistance			s	≥180	181	GB/T1411-2002
Tracking resistance	CTI		V	≥600	600 Overpass	GB/T1411-2002
Tracking resistance	PTI		V	≥600	600	GB/T1411-2002
Insulation resistance	At normal condition		Ω	≥1.0 x 10¹³	3.0 x 10¹⁴	GB/T10064-2006
Insulation resistance	After 24h in water		Ω	≥1.0 x 10¹²	2.5 x 10¹³	GB/T10064-2006
Flammability			Grade	V-0	V-0	UL94-2010
Oxygen index			℃	≥ 22	32.1	GB/T2406.1
Glow-wire test			℃	＞850	960	IEC61800-5-1

Withstand voltage

Nominal thickness（mm）	3	4	5～6	＞6
Withstand voltage in air for 1min KV	≥25	≥33	≥42	＞48

Inspection, Mark, Packaging and Storage

1. Each batch should be tested before dispatch.

2. According to the requirements of the customers, the test method of withstand voltage is negotiable according to the sheets or shapes.

3. It is packed by cardboard box on pallet. Its weight is not more than 500kg per pallet.

4. The shee ts shall be stored in a place where temperature is not higher than 40℃, and be placed horizontally on a bedplate with a height of 50mm or above. Keep away from fire, heat (heating apparatus) and direct sunshine. The storage life of sheets is 18 months from the date of leaving factory. If the storage duration is over 18 months, the product also could be used after being tested to be qualified.

5. Others shall accord with the stipulations of GB/T1305-1985,General rules for the inspection,marks,packing, transportation and storage of insulation thermosetting material.