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Elmet Technologies

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A. Schulman BMC 680 Mineral Filled, Glass Fiber Reinforced Polyester Compound
Categories: Polymer; Thermoset; Filled/Reinforced Thermoset; Polyester, TS; Thermoset Polyester Glass and Mineral Filled BMC

Material Notes: BMC 680 molding compound is a mineral filled, glass fiber-reinforced polyester compound suitable for compression and stuffer injection molding It is characterized by good moldability, very high impact strength, oil and solvent resistance and creep resistance at elevated temperatures.

Typical applications include replacements for die castings and sheet molding compounds, valve covers, intake manifolds, oil pans and circuit breakers.

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Physical PropertiesOriginal ValueComments
Specific Gravity 1.71 g/cc
Water Absorption 0.15 %24 hours, 23°C
Linear Mold Shrinkage 0.0010 - 0.0020 cm/cm
 
Mechanical PropertiesOriginal ValueComments
Hardness, Barcol 50 - 60
Tensile Strength, Ultimate 14000 - 17000 psi
Flexural Strength 30000 - 35000 psi
Compressive Strength 19000 - 24000 psi
Izod Impact, Notched 21.0 - 26.0 ft-lb/in
 
Electrical PropertiesOriginal ValueComments
Dielectric Strength 380 - 400 V/milShort Time
Arc Resistance >= 180 sec
Comparative Tracking Index >= 600 V
 
Thermal PropertiesOriginal ValueComments
Deflection Temperature at 1.8 MPa (264 psi) >= 500 °F
Flammability, UL94 HB
@Thickness 3.17 mm
 HB
@Thickness 1.59 mm
 V-0
@Thickness 6.35 mm
 
Processing PropertiesOriginal ValueComments
Mold Temperature 280 - 330 °F

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PBMC027 / 27210

Ensinger PEI

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