Celanese Crastin® SK642FR BK851 Polybutylene Terephthalate (PBT)

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Celanese Crastin® SK642FR BK851 Polybutylene Terephthalate (PBT)
Categories:	Polymer; Thermoplastic; Polyester, TP; Polybutylene Terephthalate (PBT); Polybutylene Terephthalate (PBT), 20% Glass Fiber Filled
Material Notes:	15% Glass Reinforced Flame Retardant Polybutylene Terephthalate Crastin SK642FR BK851 is a black 15% glass fiber reinforced flame retardant polybutylene terephthalate for injection molding. It has a UL94 V-0 rating @ 0.75mm. Former DuPont product acquired by Celanese in 2022.
Key Words:	PBT-GF15FR(17)
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Physical Properties	Original Value	Comments

Density	1.58 g/cc	ISO 1183
Viscosity Number	110 cm³/g	ISO 307, 1157, 1628
Linear Mold Shrinkage, Flow	0.0070 cm/cm	ISO 294-4, 2577
Linear Mold Shrinkage, Transverse	0.012 cm/cm	ISO 294-4, 2577

Mechanical Properties	Original Value	Comments
Tensile Strength at Break	100 MPa	ISO 527-1/-2
Elongation at Break	3.4 %	ISO 527-1/-2
Tensile Modulus	7200 MPa	ISO 527-1/-2
Flexural Strength	155 MPa	ISO 178
Poissons Ratio	0.35
Charpy Impact Unnotched	53.0 kJ/m² @Temperature 23.0 °C	ISO 179/1eU
Charpy Impact, Notched	7.40 kJ/m² @Temperature 23.0 °C	ISO 179/1eA

Electrical Properties	Original Value	Comments
Volume Resistivity	>= 1.00e+15 ohm-cm	IEC 62631-3-1
Surface Resistance	1.00e+14 ohm	IEC 62631-3-2
Dielectric Constant	3.9 @Frequency 1e+6 Hz	IEC 62631-2-1
	4.2 @Frequency 100 Hz	IEC 62631-2-1
Dielectric Strength	32.0 kV/mm	IEC 60243-1
Dissipation Factor	0.00196 @Frequency 100 Hz	IEC 62631-2-1
	0.0171 @Frequency 1e+6 Hz	IEC 62631-2-1
Comparative Tracking Index	200 V	IEC 60112

Thermal Properties	Original Value	Comments
Melting Point	225 °C	10°C/min; ISO 11357-1/-3
Deflection Temperature at 0.46 MPa (66 psi)	218 °C	ISO 75-1/-2
Deflection Temperature at 1.8 MPa (264 psi)	203 °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
	5VA @Thickness 1.50 mm	IEC 60695-11-20
Oxygen Index	32 %	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-GF15FR(17)<	ISO 11469
Polymer	PBT-GF15 FR(17)
Processing Hold Pressure Time (s/mm)	3	Injection
Resin Identification	PBT-GF15FR(17)	ISO 1043

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PDSY5082 / 160909

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