Celanese Crastin® ST820 BK503 PBT-HI

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Celanese Crastin® ST820 BK503 PBT-HI
Categories:	Polymer; Thermoplastic; Polyester, TP; Polybutylene Terephthalate (PBT); Polybutylene Terephthalate (PBT), Impact Grade
Material Notes:	Unreinforced Polybutylene Terephthalate with Excellent Impact Resistance Former DuPont product acquired by Celanese in 2022.
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Physical Properties	Original Value	Comments

Density	1.22 g/cc	ISO 1183
Linear Mold Shrinkage, Flow	0.018 cm/cm	ISO 294-4, 2577
Linear Mold Shrinkage, Transverse	0.017 cm/cm	ISO 294-4, 2577

Mechanical Properties	Original Value	Comments
Tensile Strength, Yield	36.0 MPa	ISO 527-1/-2
Elongation at Break	>= 50 %	Nominal; ISO 527-1/-2
Elongation at Yield	7.0 %	ISO 527-1/-2
Tensile Modulus	1600 MPa	ISO 527-1/-2
Flexural Strength	50.0 MPa	ISO 178
Flexural Modulus	1500 MPa	ISO 178
Poissons Ratio	0.42
Izod Impact, Notched (ISO)	10.0 kJ/m² @Temperature -40.0 °C	ISO 180/1A
	60.0 kJ/m² @Temperature 23.0 °C	ISO 180/1A
Izod Impact, Unnotched (ISO)	NB @Temperature -30.0 °C	ISO 180/1U
	NB @Temperature 23.0 °C	ISO 180/1U
Charpy Impact Unnotched	NB @Temperature -30.0 °C	ISO 179/1eU
	NB @Temperature 23.0 °C	ISO 179/1eU
Charpy Impact, Notched	10.0 kJ/m² @Temperature -30.0 °C	ISO 179/1eA
	85.0 kJ/m² @Temperature 23.0 °C	ISO 179/1eA

Thermal Properties	Original Value	Comments
Melting Point	225 °C	10°C/min; ISO 11357-1/-3
Deflection Temperature at 0.46 MPa (66 psi)	100 °C	ISO 75-1/-2
	145 °C	Annealed; ISO 75-1/-2
Deflection Temperature at 1.8 MPa (264 psi)	50.0 °C	ISO 75-1/-2
Glass Transition Temp, Tg	55.0 °C	10°C/min; ISO 11357-1/-2
Flame Spread	38.0 mm/min @Thickness 1.00 mm	ISO 3795 (FMVSS 302)

Processing Properties	Original Value	Comments
Melt Temperature	250 °C	Optimum, Injection
	240 - 260 °C	Range, Extrusion
	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
	110 - 130 °C	Extrusion
Dry Time	2.00 - 4.00 hour	Extrusion, Dehumidified Dryer
	2.00 - 4.00 hour	Injection, Dehumidified Dryer
Moisture Content	<= 0.040 %	Extrusion
	<= 0.040 %	Injection
Hold Pressure	>= 60.0 MPa	Injection

Descriptive Properties
Back pressure	As low as possible
Drying Recommended	yes	Injection
FMVSS Class	B	ISO 3795 (FMVSS 302)
Fogging (mg)	0.1	G-value (condensate); ISO 6452
Part Marking Code	>PBT-HI<	ISO 11469
Polymer	PBT
Processing Hold Pressure Time (s/mm)	3	Injection
Resin Identification	PBT-HI	ISO 1043

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PDSX5074 / 197714

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