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Specialty Compounds RTP Company

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MRC Polymers NAXALOY™ 780 PC+PBT Polyester Blend
Categories: Polymer; Thermoplastic; Polycarbonate (PC); Polycarbonate/Polybutylene Terephthalate (PBT) Blend, Unreinforced; Polyester, TP; Polybutylene Terephthalate (PBT)

Material Notes: Good chemical resistance, impact and heat resistance.

Information provided by MRC Polymers Inc.

Key Words: PC, PBT
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Physical PropertiesOriginal ValueComments
Specific Gravity 1.20 g/ccsolid; ASTM D792
Water Absorption 0.12 - 0.16 %
@Temperature 22.8 °C,
Time 86400 sec
ASTM D570
Linear Mold Shrinkage 0.0060 - 0.0090 in/inASTM D955
 
Mechanical PropertiesOriginal ValueComments
Tensile Strength, Yield 8500 psiASTM D638
Flexural Strength 12.5 ksiASTM D790
Flexural Modulus 340 ksiASTM D790
Izod Impact, Notched 13.0 ft-lb/inASTM D256
 
Thermal PropertiesOriginal ValueComments
Deflection Temperature at 0.46 MPa (66 psi) 225 °FASTM D648
Deflection Temperature at 1.8 MPa (264 psi) 212 °FASTM D648
 
Processing PropertiesOriginal ValueComments
Rear Barrel Temperature 460 - 480 °F
Middle Barrel Temperature 470 - 490 °F
Front Barrel Temperature 490 - 510 °F
Nozzle Temperature 490 - 520 °F
Melt Temperature 480 - 520 °F
Mold Temperature 140 - 200 °F
Drying Temperature 225 - 235 °F
Dry Time 4 - 6 hour
Moisture Content <= 0.020 %
Dew Point <= 0.000 °F
Drying Air Flow Rate 0.800 - 1.00 ft³/min (CFM)per lb/hour resin processed
Injection Pressure 5000 - 25000 psi
Back Pressure 0.000 - 75.0 psi
Shot Size 50 - 80 %
Vent Depth 0.000500 - 0.000800 in
Cushion 0.250 in
Screw Speed 50 - 80 rpm
 
Descriptive Properties
Fill RateModerate to Fast
Hold Pressure40-60% of injection pressure
Packing Pressure50-75% of injection pressure

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PMRC021 / 89450

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