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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

24hours after soaking

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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