Crastin® LW9320 BK851 is a 20% glass fiber reinforced polybutylene terephthalate blend for injection molding. It has improved surface esthetics, excellent dimensional stability and low warpage characteristics.
Polymer Name: PBT/SAN Alloy
Processing Methods: Injection Molding
Density: 1340.0 kg/m³
Flexural Modulus: 7000.0 MPa
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Crastin® LW9320 BK851 Features & Benefits
Materials Features
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
Markets
Plastics & Elastomers End Uses
Plastics & Elastomers Processing Methods
Properties
Chemical Resistance
Color
Flame Rating
Part Marking Code
Mechanical Properties
| Value | Units | Test Method / Conditions | |
| Tensile Modulus | 7500 | MPa | ISO 527-1/-2 |
| Stress (at Break) | 120 | MPa | ISO 527-1/-2 |
| Flexural Modulus | 7000 | MPa | ISO 178 |
| Strain (at Break) | 2.3 | % | ISO 527-1/-2 |
| Charpy Impact Strength (at 23°C) | 45 | kJ/m² | ISO 179/1eU |
| Charpy Impact Strength (at -30°C) | 40 | kJ/m² | ISO 179/1eU |
| Poisson's Ratio | 0.34 | - | - |
| Notched Charpy Impact Strength (at 23°C) | 7 | kJ/m² | ISO 179/1eA |
| Notched Izod Impact Strength (at 23°C) | 6.5 | kJ/m² | ISO 180/1A |
Typical Properties
| Value | Units | Test Method / Conditions | |
| Resin Identification | PBT+SAN-GF20 | - | ISO 1043 |
Thermal Properties
| Value | Units | Test Method / Conditions | |
| Melt Temperature (at 10°C/min) | 220 | °C | ISO 11357-1/-3 |
| Glass Transition Temperature (at 10°C/min) | 110 | °C | ISO 11357-1/-2 |
| Temperature of Deflection Under Load (1.8 Mpa) | 165 | °C | ISO 75-1/-2 |
| Relative Thermal Index (Electrical, 0.75mm) | 130 | °C | UL 746B |
| Relative Thermal Index (Electrical, 1.5mm) | 130 | °C | UL 746B |
| Relative Thermal Index (Electrical, 3mm) | 130 | °C | UL 746B |
| Relative Thermal Index (Impact, 0.75mm) | 125 | °C | UL 746B |
| Relative Thermal Index (Impact, 1.5mm) | 125 | °C | UL 746B |
| Relative Thermal Index (Impact, 3mm) | 130 | °C | UL 746B |
| Relative Thermal Index (Strength, 0.75mm) | 130 | °C | UL 746B |
| Relative Thermal Index (Strength, 1.5mm) | 130 | °C | UL 746B |
| Relative Thermal Index (Strength, 3mm) | 130 | °C | UL 746B |
Flammability
| Value | Units | Test Method / Conditions | |
| FMVSS Class | B | - | ISO 3795 (FMVSS 302) |
| Burning Behavior (at 1.5mm Nominal Thickness) | UL94 HB | class | IEC 60695-11-10 |
| Burning Behavior (at 0.75mm Thickness h) | UL94 HB | class | IEC 60695-11-10 |
| Burning Rate (at 1mm Thickness) | 32 | mm/min | ISO 3795 (FMVSS 302) |
Other Properties
| Value | Units | Test Method / Conditions | |
| Density | 1340 | kg/m³ | ISO 1183 |
VDA Properties
| Value | Units | Test Method / Conditions | |
| Emission of Organic Compounds | 130 | µgC/g | VDA 277 |
| Odor | 3.5 | class | VDA 270 |
Processing Information (Injection Molding)
| Value | Units | Test Method / Conditions | |
| Drying Recommended | yes | - | - |
| Drying Temperature | 120 | °C | - |
| Drying Time (Dehumidified Dryer) | 2 - 4 | h | - |
| Processing Moisture Content | max. 0.04 | % | - |
| Hold Pressure Range | min. 60 | MPa | - |
| Hold Pressure Time | 3 | s/mm | - |
| Back Pressure | As low as possible | MPa | - |
| Ejection Temperature | 170 | °C | - |
| Melt Temperature (Optimum) | 250 | °C | - |
| Melt Temperature (Minimum) | 240 | °C | - |
| Melt Temperature (Maximum) | 260 | °C | - |
| Mold Temperature (Optimum) | 80 | °C | - |
| Mold Temperature (Minimum) | 30 | °C | - |
| Mold Temperature (Maximum) | 130 | °C | - |
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: ++++
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Crastin® LW9320 BK851
DuPont