Covestro Makroblend® KU 2-7912/5 Polycarbonate + PBT, Impact Grade

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Covestro Makroblend® KU 2-7912/5 Polycarbonate + PBT, Impact Grade (discontinued **)
Categories:	Polymer; Thermoplastic; Polycarbonate (PC); Polycarbonate/Polybutylene Terephthalate (PBT) Blend, Unreinforced; Polyester, TP; Polybutylene Terephthalate (PBT)
Material Notes:	Developmental product ISO 7792-1-PBT/PC,MHPR,-020 (PC+PBT)-blends impact modified Injection molding grade high flow high toughness at low temperatures unreinforced As of 1 September 2015, Bayer MaterialScience was separated from Bayer AG and officially adopted its new name – Covestro.
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Physical Properties	Original Value	Comments

Density	1.20 g/cc	ISO 1183
Melt Density	1.03 g/cc @Temperature 260 °C
Water Absorption	0.50 %	Similar to ISO 62
Moisture Absorption at Equilibrium	0.20 %	Similar to ISO 62
Melt Flow	7.2 g/10 min @Load 2.16 kg, Temperature 250 °C	ISO 1133

Mechanical Properties	Original Value	Comments
Tensile Strength, Yield	50.0 MPa	ISO 527-1/-2
Elongation at Break	>= 50 %	Nominal; ISO 527-1/-2
Elongation at Yield	4.0 %	ISO 527-1/-2
Tensile Modulus	2000 MPa	ISO 527-1/-2
Charpy Impact Unnotched	NB	ISO 179/1eU
	NB @Temperature -30.0 °C	ISO 179/1eU
Charpy Impact, Notched	6.00 J/cm²	ISO 179/1eA
	4.00 J/cm² @Temperature -30.0 °C	ISO 179/1eA

Electrical Properties	Original Value	Comments
Volume Resistivity	>= 1.00e+13 ohm-cm	IEC 60093
Surface Resistance	>= 1.00e+15 ohm	IEC 60093
Dielectric Constant	3.1 @Frequency 1e+6 Hz	IEC 60250
	3.2 @Frequency 100 Hz	IEC 60250
Dielectric Strength	35.0 kV/mm	IEC 60243-1
Dissipation Factor	0.0014 @Frequency 100 Hz	IEC 60250
	0.0125 @Frequency 1e+6 Hz	IEC 60250
Comparative Tracking Index	600 V	IEC 60112

Thermal Properties	Original Value	Comments
CTE, linear, Parallel to Flow	90.0 µm/m-°C	ISO 11359-1/-2
CTE, linear, Transverse to Flow	90.0 µm/m-°C	ISO 11359-1/-2
Specific Heat Capacity	1.78 J/g-°C	Melt
Thermal Conductivity	0.167 W/m-K	Melt
Melting Point	224 °C	ISO 11357-1/-3
Deflection Temperature at 0.46 MPa (66 psi)	100 °C	ISO 75-1/-2
Deflection Temperature at 1.8 MPa (264 psi)	82.0 °C	ISO 75-1/-2
Flammability, UL94	HB @Thickness 1.60 mm	IEC 60695-11-10
Oxygen Index	21 %	ISO 4589-1/-2

Processing Properties	Original Value	Comments
Melt Temperature	250 - 270 °C
	260 °C	Injection Molding; ISO 294
Mold Temperature	60.0 - 80.0 °C
	70.0 °C	Injection Molding; ISO 10724
	60.0 - 80.0 °C
Ejection Temperature	170 °C
Injection Velocity	200 mm/sec	ISO 294
Drying Temperature	100 - 105 °C
Dry Time	2.00 - 3.00 hour	Dry air dryer
	2.00 - 3.00 hour	Fresh air dryer (high speed dryer)
	4.00 - 8.00 hour	Circulating air drying oven (50 % fresh air)
Moisture Content	<= 0.010 %

Descriptive Properties
Availability	Asia Pacific
	Europe
	India
	Near East/Africa
	North America
	South and Central America
Eff. thermal diffusivity (m²/s)	9.15E-08
Feature	Release agent
Form	Pellets
Process	Injection Molding

**
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