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Crastin® SK605 BK851

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Polymer Name: Polybutylene Terephthalate (PBT), Thermoplastic Polyester
Processing Methods: Injection Molding, Extrusion
Fillers Included: Glass Fiber
Flexural Modulus: 9000.0 MPa
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Crastin® SK605 BK851
DuPont
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Identification & Functionality

Crastin® SK605 BK851 Features & Benefits

Industry Needs

DuPont™ Crastin® is a stiff, tough PBT thermoplastic with superior electrical insulating properties. Crastin® PBT is the resin of choice for cost-effective, high-performing automotive radar systems.

  • Low dielectric properties for radar transparency.
  • Material and design solutions for radar absorbency.
  • Excellent dimensional stability and low warpage.
  • Excellent balance of mechanical properties.
  • Resistance to exterior environments, including road salt, automotive fluids, thermal cycling, and hydrolysis resistance.
  • Improved laser-marking properties.

 

Back Housing and Connector

  • Higher thermal conductivity for heat dissipation
  • EMI shielding (depending on requirements)
  • Improved toughness
  • Superior hydrolysis resistance for hot and humid environments
  • Improved thermal-shock-cycling resistance
  • Available laser transparent and improved laser marking
  • Low warpage for higher dimensional control
  • Standard grade with good mechanical properties

 

Mounting Brackets Sensor Support

  • Excellent combination of toughness and stiffness.
  • Good chemical resistance.
  • Extensive material data available for anisotropic analysis.
  • Improved laser marking solutions available.

 

Radome

  • Improved radio transparency with low Dk and low Df
  • Excellent dimensional stability
  • Improved toughness
  • Superior hydrolysis resistance for hot and humid environments
  • Available laser transparent and with improved laser marking
  • Low warpage for higher dimensional control
  • Standard grade with good mechanical properties

Applications & Uses

Properties

Mechanical Properties
ValueUnitsTest Method / Conditions
Tensile Modulus10000MPaISO 527
Stress at Break140MPaISO 527-1/-2
Strain at Break2.7%ISO 527-1,2
Flexural Modulus9000MPaASTM D790
Flexural Strength200MPaASTM D 790
Charpy Impact Strength (23°C)65kJ/m2ISO 179/1eU
Charpy Notched Impact Strength (23°C)10kJ/m2ISO 179/1eA
Izod Notched Impact Strength (23°C)9kJ/m2ISO 180/1A
Izod Impact Strength (23°C)60kJ/m²ISO 180/1U
Izod Impact Strength (-30°C)55kJ/m²ISO 180/1U
Izod Impact Strength (-40°C)55kJ/m²ISO 180/1U
Ball Indentation Hardness (H 358/30)205MPaISO 2039-1
Poisson's Ratio0.34-ASTM E132
Physical Properties
ValueUnitsTest Method / Conditions
Melt Volume - Flow Rate7cm³/10minISO 1133
Melt Mass Flow Rate - MFR (250°C/2.16 kg)10g/10 minSTN EN ISO 1133
Load2.16kgISO 1133
Molding Shrinkage - Parallel0.3%ISO 294-4, 2577
Molding Shrinkage - Normal1.1%ISO 294-4, 2577
Post Molding Shrinkage - Normal (48 h at 80°C)0.2%ISO 294-4
Post Molding Shrinkage - Parallel (48 h at 80°C)0.1%ISO 294-4
Temperature250°CISO 1133
Thermal Properties
ValueUnitsTest Method / Conditions
Melting Temperature (10°C/min)225°CISO 11357-1/-3
Temperature of Deflection Under Load(1.8 MPa)205°CISO 75-1/-2
Specific Heat Capacity of Melt1730J/(kg K)-
Relative Temperature Index - Electrical (0.75 mm)130°CUL 746B
Relative Temperature Index - Electrical (1.5 mm)130°CUL 746B
Relative Temperature Index - Electrical (3 mm)130°CUL 746B
Relative Temperature Index - Electrical (6 mm)130°CUL 746B
Relative Temperature Index - Impact (0.75 mm)130°CUL 746B
Relative Temperature Index - Impact (1.5 mm)130°CUL 746B
Relative Temperature Index - Impact (3 mm)130°CUL 746B
Relative Temperature Index - Impact (6 mm)130°CUL 746B
Relative Temperature Index - Strength (0.75 mm)130°CUL 746B
Relative Temperature Index - Strength (1.5 mm)130°CUL 746B
Relative Temperature Index - Strength (3 mm)130°CUL 746B
Relative Temperature Index - Strength (6 mm)130°CUL 746B
Thermal Conductivity of Melt0.28W/(m K)-
Ball Pressure Test210°CIEC 60695-10-2
Electrical Properties
ValueUnitsTest Method / Conditions
Comparative Tracking Index - CTI225VIEC 60112
Flammability
ValueUnitsTest Method / Conditions
Burning Behaviour (1.5 mm, Nominal Thickness)HBclassIEC 60695-11-10
Burning Behaviour (Thickness h)HBclassIEC 60695-11-10
Oxygen Index20%ISO 4589-1/-2
Glow Wire Flammability Index - GWFI (0.75 mm)725°CIEC 60695-2-12
Glow Wire Flammability Index - GWFI (1.5 mm)725°CIEC 60695-2-12
Glow Wire Flammability Index - GWFI (3 mm)750°CIEC 60695-2-12
Glow Wire Ignition Temperature - GWIT (0.75 mm)750°CIEC 60695-2-13
Glow Wire Ignition Temperature - GWIT (1.5 mm)750°CIEC 60695-2-13
Glow Wire Ignition Temperature (3 mm)775°CIEC 60695-2-13
FMVSS ClassB-ISO 3795 (FMVSS 302)
Burning Rate (1 mm, Thickness)54mm/minISO 3795 (FMVSS 302)
Ul RecognitionYes-UL 94
Thickness Tested1.5mmIEC 60695-11-10
Other Properties
ValueUnitsTest Method / Conditions
Humidity Absorption (2 mm)0.15%Sim. to ISO 62
Water Absorption (2 mm)0.35%Sim. to ISO 62
Density1530kg/m³ISO 1183
Processing Information (Injection Molding)
ValueUnitsTest Method / Conditions
Drying RecommendedYes--
Drying Temperature120°C-
Drying Time (Dehumidified Dryer)2.0 - 4.0h-
Processing Moisture Content≤0.04%-
Melt Temperature Optimum250°C-
Min. Melt Temperature240°C-
Max. Melt Temperature260°C-
Mold Temperature Optimum80°C-
Min. Mold Temperature30°C-
Max. Mold Temperature130°C-
Hold Pressure Range≥60MPa-
Hold Pressure Time3s/mm-
Back PressureAs low as possible--
Ejection Temperature170°C-
VDA Properties
ValueUnitsTest Method / Conditions
Emission of Organic Compounds110µgC/gVDA 277
Odour3classVDA 270
Fogging - F Value (Refraction)99%ISO 6452
Solutions for Radar Housing and Connector
  Dielectric Properties
at 77GHz
Low-Warpage /
Dimensional Stability
Laser Weldable
(Transparent)
Hydrolysis
Resistant
Crastin® SK605 + ++ +++ ++

 

Best: ++++

Chemical Resistance
Chemical Type Chemical Name Resistance
Acids Acetic Acid (5% by mass) (23°C) Probably Resistant
Acids Chromic Acid solution (40% by mass) (23°C) Not Recommended
Acids Citric Acid solution (10% by mass) (23°C) Probably Resistant
Acids Hydrochloric Acid (36% by mass) (23°C) Not Recommended
Acids Lactic Acid (10% by mass) (23°C) Probably Resistant
Acids Nitric Acid (40% by mass) (23°C) Not Recommended
Acids Sulfuric Acid (38% by mass) (23°C) Not Recommended
Acids Sulfuric Acid (5% by mass) (23°C) Not Recommended
Alcohols Ethanol (23°C) Probably Resistant
Alcohols Isopropyl alcohol (23°C) Probably Resistant
Alcohols Methanol (23°C) Probably Resistant
Bases Ammonium Hydroxide solution (10% by mass) (23°C) Probably Resistant
Bases Sodium Hydroxide solution (1% by mass) (23°C) Probably Resistant
Bases Sodium Hydroxide solution (35% by mass) (23°C) Not Recommended
Ethers Diethyl ether (23°C) Probably Resistant
Hydrocarbons iso-Octane (23°C) Probably Resistant
Hydrocarbons n-Hexane (23°C) Probably Resistant
Hydrocarbons Toluene (23°C) Probably Resistant
Ketones Acetone (23°C) Probably Resistant
Mineral oils Automatic hypoid-gear oil Shell Donax TX (135°C) Not Recommended
Mineral oils Hydraulic oil Pentosin CHF 202 (125°C) Not Recommended
Mineral oils Insulating Oil (23°C) Probably Resistant
Mineral oils Motor oil OS206 304 Ref.Eng.Oil, ISP (135°C) Not Recommended
Mineral oils SAE 10W40 multigrade motor oil (130°C) Not Recommended
Mineral oils SAE 10W40 multigrade motor oil (23°C) Probably Resistant
Mineral oils SAE 80/90 hypoid-gear oil (130°C) Not Recommended
Other 1% nonylphenoxy-polyethyleneoxy ethanol in water (23°C) Probably Resistant
Other 50% Oleic acid + 50% Olive Oil (23°C) Probably Resistant
Other DOT No. 4 Brake fluid (130°C) Not Recommended
Other Ethyl Acetate (23°C) Probably Resistant
Other Ethylene Glycol (50% by mass) in water (108°C) Not Recommended
Other Hydrogen peroxide (23°C) Not Recommended
Other Phenol solution (5% by mass) (23°C) Probably Resistant
Other Water (23°C) Probably Resistant
Other Water (90°C) Not Recommended
Salt solutions Sodium Carbonate solution (2% by mass) (23°C) Probably Resistant
Salt solutions Sodium Carbonate solution (20% by mass) (23°C) Probably Resistant
Salt solutions Sodium Chloride solution (10% by mass) (23°C) Probably Resistant
Salt solutions Sodium Hypochlorite solution (10% by mass) (23°C) Probably Resistant
Salt solutions Zinc Chloride solution (50% by mass) (23°C) Probably Resistant
Standard Fuels Diesel fuel (pref. ISO 1817 Liquid F) (>90°C) Not Recommended
Standard Fuels Diesel fuel (pref. ISO 1817 Liquid F) (23°C) Probably Resistant
Standard Fuels Diesel fuel (pref. ISO 1817 Liquid F) (90°C) Probably Resistant
Standard Fuels ISO 1817 Liquid 1 - E5 (60°C) Not Recommended
Standard Fuels ISO 1817 Liquid 2 - M15E4 (60°C) Not Recommended
Standard Fuels ISO 1817 Liquid 3 - M3E7 (60°C) Not Recommended
Standard Fuels ISO 1817 Liquid 4 - M15 (60°C) Not Recommended
Standard Fuels Standard fuel with alcohol (pref. ISO 1817 Liquid 4) (23°C) Probably Resistant
Standard Fuels Standard fuel without alcohol (pref. ISO 1817 Liquid C) (23°C) Probably Resistant

Regulatory & Compliance

Technical Details & Test Data

Dynamic Tensile Modulus vs Temperature

DuPont Crastin SK605 BK851 Dynamic Tensile Modulus vs Temperature

Stress vs Strain

DuPont Crastin SK605 BK851 Stress vs Strain

Secant Modulus vs Strain

DuPont Crastin SK605 BK851 Secant Modulus vs Strain

Packaging & Availability