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Ensinger PEI

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A. Schulman BMC 685 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 685 molding compound is a mineral filled, glass fiber-reinforced polyester compound suitable for compression, transfer and stuffer injection molding It is characterized by good moldability, 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 1.75 g/cc
Water Absorption 0.11 %24 hours, 23°C
Linear Mold Shrinkage 0.0015 - 0.0025 cm/cm
 
Mechanical PropertiesOriginal ValueComments
Hardness, Barcol 55 - 65
Tensile Strength, Ultimate 9000 - 12000 psi
Flexural Strength 26000 - 31000 psi
Compressive Strength 26000 - 31000 psi
Izod Impact, Notched 14.0 - 19.0 ft-lb/in
 
Electrical PropertiesOriginal ValueComments
Dielectric Strength 390 - 410 V/milShort Time
Arc Resistance >= 190 sec
Comparative Tracking Index >= 500 V
 
Thermal PropertiesOriginal ValueComments
Deflection Temperature at 1.8 MPa (264 psi) >= 500 °F
Flammability, UL94 HB
@Thickness 1.59 mm
 V-0
@Thickness 6.35 mm
 V-0
@Thickness 3.17 mm
 
Processing PropertiesOriginal ValueComments
Mold Temperature 280 - 330 °F

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