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Crastin® LW9320 BK851

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Polymer Name: PBT/SAN Alloy
Processing Methods: Injection Molding
Density: 1340.0 kg/m³
Flexural Modulus: 7000.0 MPa
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Identification & Functionality

Chemical Family
Fillers Included
Polymer Name
Plastics & Elastomers Functions
Technologies

Crastin® LW9320 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 Modulus7500MPaISO 527
Stress at Break120MPaISO 527-1/-2
Strain at Break2.3%ISO 527-1/-2
Flexural Modulus7000MPaASTM D 790
Charpy Impact Strength (23°C)45kJ/m2ISO 179/1eU
Charpy Impact Strength (-30°C)40kJ/m2ISO 179/1eU
Charpy Notched Impact Strength (23°C)7kJ/m2ISO 179-1/1eA
Izod Notched Impact Strength (23°C)6.5kJ/m2ISO 180/1A
Poisson's Ratio0.34-ASTM E132
Thermal Properties
ValueUnitsTest Method / Conditions
Melting Temperature (10°C/min)220°CISO 11357-1/-3
Temperature of Deflection Under Load(1.8 MPa)165°CISO 75-1/-2
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 - Impact (0.75 mm)125°CUL 746B
Relative Temperature Index - Impact (1.5 mm)125°CUL 746B
Relative Temperature Index - Impact (3 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
Flammability
ValueUnitsTest Method / Conditions
Burning Behaviour (1.5 mm, Nominal Thickness)HBclassIEC 60695-11-10
Burning Behaviour (Thickness h)HBclassIEC 60695-11-10
FMVSS ClassB-ISO 3795 (FMVSS 302)
Burning Rate (1 mm, Thickness)32mm/minISO 3795 (FMVSS 302)
Ul RecognitionYes-UL 94
Thickness Tested1.5mmIEC 60695-11-10
Other Properties
ValueUnitsTest Method / Conditions
Density1340kg/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 Compounds130µgC/gVDA 277
Odour3.5classVDA 270
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 Insulating Oil (23°C) Probably Resistant
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

Solutions for Radar Housing and Connector
  Dielectric Properties
at 77GHz
Low-Warpage /
Dimensional Stability
Laser Weldable
(Transparent)
Hydrolysis
Resistant
Crastin® LW9320 +++ ++++ ++++ +++

 

Best: ++++

 

Regulatory & Compliance

Certifications & Compliance
Compliance
UL Flame Rated
Crastin® LW9320 BK851
DuPont