Celanese Crastin® SK643FR NC010 Polybutylene Terephthalate (PBT)

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Celanese Crastin® SK643FR NC010 Polybutylene Terephthalate (PBT)
Categories:	Polymer; Thermoplastic; Polyester, TP; Polybutylene Terephthalate (PBT); Polybutylene Terephthalate (PBT), 20% Glass Fiber Filled
Material Notes:	20% Glass Reinforced Flame Retardant Polybutylene Terephthalate Crastin SK643FR is a flame retardant 20% glass reinforced polybutylene terephthalate molding resin. It is recognized as UL94V-0 at 0.8mm. Former DuPont product acquired by Celanese in 2022.
Key Words:	PBT-GF20FR(17)
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Physical Properties	Original Value	Comments

Density	1.63 g/cc	ISO 1183
Water Absorption	0.30 % @Thickness 2.00 mm	Sim. to ISO 62
Moisture Absorption	0.150 % @Thickness 2.00 mm	Sim. to ISO 62
Viscosity Number	100 cm³/g	ISO 307, 1157, 1628
Linear Mold Shrinkage, Flow	0.0050 cm/cm	ISO 294-4, 2577
	0.0060 cm/cm	annealed; ISO 294-4
	0.0010 cm/cm @Treatment Temp. 80.0 °C, Time 173000 sec	Postmolding shrinkage; ISO 294-4
Linear Mold Shrinkage, Transverse	0.012 cm/cm	ISO 294-4, 2577
	0.0145 cm/cm	annealed; ISO 294-4
	0.0030 cm/cm @Treatment Temp. 80.0 °C, Time 173000 sec	Postmolding shrinkage; ISO 294-4
Melt Flow	6.0 g/10 min @Load 2.16 kg, Temperature 250 °C	cm³/10min Volumetric; ISO 1133
	9.0 g/10 min @Load 2.16 kg, Temperature 250 °C	ISO 1133

Mechanical Properties	Original Value	Comments
Tensile Strength at Break	113 MPa	ISO 527-1/-2
Elongation at Break	3.0 %	ISO 527-1/-2
Tensile Modulus	8500 MPa	ISO 527-1/-2
Flexural Strength	170 MPa	ISO 178
Poissons Ratio	0.34
Izod Impact, Notched (ISO)	7.00 kJ/m² @Temperature -30.0 °C	ISO 180/1A
	8.00 kJ/m² @Temperature 23.0 °C	ISO 180/1A
Izod Impact, Unnotched (ISO)	35.0 kJ/m² @Temperature -30.0 °C	ISO 180/1U
	36.0 kJ/m² @Temperature 23.0 °C	ISO 180/1U
Charpy Impact Unnotched	53.0 kJ/m² @Temperature -30.0 °C	ISO 179/1eU
	55.0 kJ/m² @Temperature 23.0 °C	ISO 179/1eU
Charpy Impact, Notched	7.80 kJ/m² @Temperature -30.0 °C	ISO 179/1eA
	8.50 kJ/m² @Temperature 23.0 °C	ISO 179/1eA
Tensile Creep Modulus, 1 hour	7200 MPa	1h; ISO 899-1
Tensile Creep Modulus, 1000 hours	5500 MPa	1000h; ISO 899-1

Electrical Properties	Original Value	Comments
Volume Resistivity	>= 1.00e+15 ohm-cm	IEC 62631-3-1
Surface Resistance	1.00e+15 ohm	IEC 62631-3-2
Dielectric Constant	3.7 @Frequency 1e+6 Hz	IEC 62631-2-1
	3.8 @Frequency 100 Hz	IEC 62631-2-1
Dielectric Strength	28.0 kV/mm	IEC 60243-1
Dissipation Factor	0.0030 @Frequency 100 Hz	IEC 62631-2-1
	0.016 @Frequency 1e+6 Hz	IEC 62631-2-1
Comparative Tracking Index	250 V	IEC 60112

Thermal Properties	Original Value	Comments
CTE, linear, Parallel to Flow	40.0 µm/m-°C	ISO 11359-1/-2
CTE, linear, Transverse to Flow	100 µm/m-°C	ISO 11359-1/-2
Melting Point	224 °C	10°C/min; ISO 11357-1/-3
Deflection Temperature at 0.46 MPa (66 psi)	220 °C	ISO 75-1/-2
Deflection Temperature at 1.8 MPa (264 psi)	205 °C	ISO 75-1/-2
Glass Transition Temp, Tg	55.0 °C	10°C/min; ISO 11357-1/-2
Flammability, UL94	V-0 @Thickness 0.750 mm	IEC 60695-11-10
	V-0 @Thickness 1.50 mm	IEC 60695-11-10
Oxygen Index	31 %	ISO 4589-1/-2

Processing Properties	Original Value	Comments
Melt Temperature	250 °C	Optimum, Injection
	240 - 260 °C	Range, Injection
Mold Temperature	80.0 °C	Optimum, Injection
	30.0 - 130 °C	Injection
Ejection Temperature	170 °C	Injection
Drying Temperature	120 °C	Injection
Dry Time	2.00 - 4.00 hour	Injection, Dehumidified Dryer
Moisture Content	<= 0.040 %	Injection
Hold Pressure	>= 60.0 MPa	Injection

Descriptive Properties
Additives	Flame retardant
Back pressure	As low as possible
Drying Recommended	yes	Injection
FMVSS Class	DNI	ISO 3795 (FMVSS 302)
Part Marking Code	>PBT-GF20FR(17)<	ISO 11469
Polymer	PBT-GF20 FR(17)
Processing Hold Pressure Time (s/mm)	3	Injection
Resin Identification	PBT-GF20FR(17)	ISO 1043

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