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SMC系列模塑料

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Sheet Molding compound (SMC) is a mineral filled, fiberglass reinforced polyester (vinyl ester and phenolic) based molding compound. SMC is a thermosetting material that undergoes an irreversible cross-linking reaction when exposed to the heat and pressure of the thermoset molding process (i.e. ambient delivery of material to a heated molding surface).A somewhat tacky, dough-like mass in its unmolded state, SMC is covered to an infusible, solid state using injection, compression and transfer methods.

SMC provides a competitive alternative to die cast and drawn metals, sheet molding products and engineering thermoplastics. Notable SMC properties include resistance to creep and discoloration when exposed to heat and load, notched impact performance, high modulus and surface durability(resistant to reagent/stain, chemical, scratch and ultra violet attack).SMC can be formulated to meet specific a performance profile, this unique customization allows for the elimination of costly additives and reinforcements where possible. This “cafeteria approach’’ to material development sets SMC apart when evaluating price versus performance properties.

SMC SPECIFICATION

	Physical properties		UNIT	SMC-1	SMC-2	SMC-3
1	Specific gravity		g/cm3	1.75—1.95
2	Water absorption		mg	≤20	≤20	--------
3	Shrink rate		%	≤0.15	≤0.15	≤0.30
4	Heat deflection temperature		°C	≥240	≥240	≥220
5	Izod impact strength notched		KJ /m2	≥90	≥60	≥45
6	Flexural strength		MPa	≥170	≥150	≥135
7	Insulation resistance	Normal	Ω	≥1.0×10¹³	≥1.0×10¹³	≥1.0×10¹²
7	Insulation resistance	24hours after soaking	Ω	≥1.0×10¹²	≥1.0×10¹²	--------
8	Dielectric strength (at 90°C in oil)		MV/m	≥12	≥12	≥10
9	Dielectric loss factor (at 1 MHz )			≤0.015	≤0.015	---------
10	Dielectric constant ((at 1 MHz )			≤4.5	≤4.5	---------
11	Surface resistivity		S	≥180	≥180	≥150
12	Tracking resistivity (PTI)		V	≥600
13	Flammability			FV0	FV0	---------
14	Long term heat resistance temperature			155	155	130

These aboved specifications are made by our country's standard which we involved in. Detailed specifications could be adjusted to meet your products' demands.

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