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Rulon Bearings

Celanese Crastin® SK605 BK851 PBT-GF30
Categories: Polymer; Thermoplastic; Polyester, TP; Polybutylene Terephthalate (PBT); Polybutylene Terephthalate (PBT), 30% Glass Fiber Filled

Material Notes: 30% Glass Reinforced Polybutylene Terephthalate

Former DuPont product acquired by Celanese in 2022.

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Physical PropertiesMetricEnglishComments
Density 1.53 g/cc0.0553 lb/in³ISO 1183
Water Absorption 0.35 %
@Thickness 2.00 mm
0.35 %
@Thickness 0.0787 in
Sim. to ISO 62
Moisture Absorption 0.150 %
@Thickness 2.00 mm
0.150 %
@Thickness 0.0787 in
Sim. to ISO 62
Linear Mold Shrinkage, Flow 0.0030 cm/cm0.0030 in/inISO 294-4, 2577
 0.0010 cm/cm
@Treatment Temp. 80.0 °C,
Time 173000 sec
0.0010 in/in
@Treatment Temp. 176 °F,
Time 48.0 hour
Postmolding shrinkage; ISO 294-4
Linear Mold Shrinkage, Transverse 0.011 cm/cm0.011 in/inISO 294-4, 2577
 0.0020 cm/cm
@Treatment Temp. 80.0 °C,
Time 173000 sec
0.0020 in/in
@Treatment Temp. 176 °F,
Time 48.0 hour
Postmolding shrinkage; ISO 294-4
Melt Flow  7.0 g/10 min
@Load 2.16 kg,
Temperature 250 °C
7.0 g/10 min
@Load 4.76 lb,
Temperature 482 °F
cm³/10min Volumetric; ISO 1133
 10 g/10 min
@Load 2.16 kg,
Temperature 250 °C
10 g/10 min
@Load 4.76 lb,
Temperature 482 °F
ISO 1133
 
Mechanical PropertiesMetricEnglishComments
Ball Indentation Hardness 205 MPa29700 psiH 358/30; ISO 2039-1
Tensile Strength at Break 140 MPa20300 psiISO 527-1/-2
Elongation at Break 2.7 %2.7 %ISO 527-1/-2
Tensile Modulus 10.0 GPa1450 ksiISO 527-1/-2
Flexural Strength 200 MPa29000 psiISO 178
Flexural Modulus 9.00 GPa1310 ksiISO 178
Poissons Ratio 0.340.34
Izod Impact, Notched (ISO) 9.00 kJ/m²
@Temperature 23.0 °C
4.28 ft-lb/in²
@Temperature 73.4 °F
ISO 180/1A
Izod Impact, Unnotched (ISO)  55.0 kJ/m²
@Temperature -40.0 °C
26.2 ft-lb/in²
@Temperature -40.0 °F
ISO 180/1U
 55.0 kJ/m²
@Temperature -30.0 °C
26.2 ft-lb/in²
@Temperature -22.0 °F
ISO 180/1U
 60.0 kJ/m²
@Temperature 23.0 °C
28.6 ft-lb/in²
@Temperature 73.4 °F
ISO 180/1U
Charpy Impact Unnotched 6.50 J/cm²
@Temperature 23.0 °C
30.9 ft-lb/in²
@Temperature 73.4 °F
ISO 179/1eU
Charpy Impact, Notched 1.00 J/cm²
@Temperature 23.0 °C
4.76 ft-lb/in²
@Temperature 73.4 °F
ISO 179/1eA
 
Electrical PropertiesMetricEnglishComments
Comparative Tracking Index 225 V225 VIEC 60112
 
Thermal PropertiesMetricEnglishComments
CTE, linear, Parallel to Flow 30.0 µm/m-°C16.7 µin/in-°FISO 11359-1/-2
CTE, linear, Transverse to Flow 90.0 µm/m-°C50.0 µin/in-°FISO 11359-1/-2
Specific Heat Capacity 1.73 J/g-°C
@Temperature 250 °C
0.413 BTU/lb-°F
@Temperature 482 °F
Melt
Thermal Conductivity 0.280 W/m-K
@Temperature 250 °C
1.94 BTU-in/hr-ft²-°F
@Temperature 482 °F
Melt
Melting Point 225 °C437 °F10°C/min; ISO 11357-1/-3
Hot Ball Pressure Test 210 °C410 °FIEC 60695-10-2
Deflection Temperature at 1.8 MPa (264 psi) 205 °C401 °FISO 75-1/-2
Glass Transition Temp, Tg 55.0 °C131 °F10°C/min; ISO 11357-1/-2
Flammability, UL94  HB
@Thickness 0.750 mm
HB
@Thickness 0.0295 in
IEC 60695-11-10
 HB
@Thickness 1.50 mm
HB
@Thickness 0.0591 in
IEC 60695-11-10
Flame Spread 54.0 mm/min
@Thickness 1.00 mm
2.13 in/min
@Thickness 0.0394 in
ISO 3795 (FMVSS 302)
Oxygen Index 20 %20 %ISO 4589-1/-2
Glow Wire Ignition Temperature  750 °C
@Thickness 0.750 mm
1380 °F
@Thickness 0.0295 in
IEC 60695-2-13
 750 °C
@Thickness 1.50 mm
1380 °F
@Thickness 0.0591 in
IEC 60695-2-13
 775 °C
@Thickness 3.00 mm
1430 °F
@Thickness 0.118 in
IEC 60695-2-13
 
Processing PropertiesMetricEnglishComments
Melt Temperature 250 °C482 °FOptimum, Injection
 240 - 260 °C464 - 500 °FRange, Injection
Mold Temperature 80.0 °C176 °FOptimum, Injection
 30.0 - 130 °C86.0 - 266 °FInjection
Ejection Temperature 170 °C338 °FInjection
Drying Temperature 120 °C248 °FInjection
Dry Time 2.00 - 4.00 hour2.00 - 4.00 hourInjection, Dehumidified Dryer
Moisture Content <= 0.040 %<= 0.040 %Injection
Hold Pressure >= 60.0 MPa>= 8700 psiInjection
 
Descriptive Properties
Back pressureAs low as possible
Drying RecommendedyesInjection
Emission of organic compounds (µgC/g)110VDA 277
FMVSS ClassBISO 3795 (FMVSS 302)
Fogging (%)99F-value (refraction); ISO 6452
Odor Class3VDA 270
Part Marking Code>PBT-GF30<ISO 11469
PolymerPBT-GF30
Processing Hold Pressure Time (s/mm)3Injection
Resin IdentificationPBT-GF30ISO 1043

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