BMC Material

BMC Brief introduction
    BMC is the abbreviation of Dough Molding Compound and it is often called unsaturated polyester dough molding compound in China. It is dough soaked materials made up of mixed short glass fibers unsaturated resin, fillings and various additives. BMC materials was first applied in Federal Germany and UK in 1960¡¯s , and then was greatly developed in U.S.A in 1970¡¯s and in Japan in 1980¡¯s respectively. Because it is endowed with favorable electrical property, mechanical performance, good high-temperature proof and chemical anti-erosion as well as being anti-erosion, it is adoptable for various processes, that is to say, it can meet performance requirements for different products, and it is widely used in all areas.
APPLICATIONS:
1. Electrical Parts:
¡¡ Low voltage types: RT series, isolation switch, panel of switch, shell of ammeter etc.
2. Automobile Parts:
¡¡ Dynamo reflector, almost all Japanese dynamo reflectors are made of BMC.
¡¡ Automobile lighter, separator and decorating plank, speaker box etc.
3. Dynamo Parts:
¡¡ Air-conditioner motor, dynamo shaft, winding framework, electrical and pneumatic parts.
PACKAGE, TRANSPORTATION AND STORAGE
BMC molding compound series are sealed in compound membrane bag, 25kilogram per bag, tied up and put into paper box;
Heavy pressure, heat , wetness and package damage should be avoided during transportation;
Validaty period is three months from the product date under the temperature below 25ºC in sunless dry storehouse, overdue can be reused if it is qualified after test.
BMC SERIES MOLDING COMPOUND PROCESS

(JB/T7770-1995)

SN	INDICATOR NAME		UNIT	BMC-1	BMC-2	BMC-3	TEST STANDARD
1	Relative Density		G/cm3	1.75~1.95	1.75~1.95	1.75~1.95	GB1033
2	Water absorption		mg	¡Ü20	¡Ü20	-	GB1034
3	Mould shrinkage		%	¡Ü0.15	¡Ü0.15	¡Ü0.30	GB1404
4	Flexural strength		Mpa	¡Ý90	¡Ý80	¡Ý70	GB1042
5	Impact strength		Kj/m2	¡Ý30	¡Ý25	¡Ý20	GB1043
6	Temperature of deflection under load		º C	¡Ý240	¡Ý240	¡Ý220	GB1634
7	Insulation strength	Normal	¦¸	¡Ý1.0¡Á1013	¡Ý1.0¡Á1013	¡Ý1.0¡Á1012	GB1410
		24hours after saturating		¡Ý1.0¡Á1012	¡Ý1.0¡Á1012	-
8	Dielectric sTRength		Mv/m	¡Ý12.0	¡Ý12.0	¡Ý10.0	GB1408
9	Dielectric loss factor		-	¡Ü0.015	¡Ü0.015	-	GB1409
10	Dielectric constant		-	¡Ü4.8	¡Ü4.8	-	GB1409
11	Surface resistivity		S	¡Ý180	¡Ý180	¡Ý180	GB1411
12	Ttacking resistance		V	¡Ý600	¡Ý600	¡Ý600	GB4027
13	Flamability rating Level		grade	FVO	FVO	-	UL-94
14	Long-term heat resistance temperature		-	155	155	130	Test with WEL type Ageing Instrument

NOTE:
1.THE COLOR FOR BMC ARE USUALLY RED, YELLOW, BLUE,WHITE, DARK, GRAY ETC. AND CAN DYE ACCORDING TO REQUIREMENTS
2.OEM ARE WELCOME