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Crastin® ST820 BK503

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Polymer Name: Polybutylene Terephthalate (PBT), Thermoplastic Polyester
Processing Methods: Injection Molding, Extrusion, Coating, Sheet, Plaques & Profiles Extrusion
Flexural Modulus: 1500.0 MPa
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Crastin® ST820 BK503
DuPont
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Identification & Functionality

Crastin® ST820 BK503 Features & Benefits

Applications & Uses

Properties

Mechanical Properties
ValueUnitsTest Method / Conditions
Tensile Modulus1600MPaISO 527
Yield Stress36MPaISO 527-1/-2
Yield Strain7%ISO 527-1/-2
Nominal Strain at Break>500%ISO 527-1/-2
Strain at Break (50 mm/min)130%ISO 527-1/-2
Flexural Modulus1500MPaASTM D 790
Flexural Strength50MPaASTM D 790
Charpy Impact Strength (23°C)No BreakkJ/m2ISO 179/1eU
Charpy Impact Strength (-30°C)No BreakkJ/m2ISO 179/1eU
Charpy Notched Impact Strength (23°C)85kJ/m2STN EN ISO 179
Charpy Notched Impact Strength (-30°C)10kJ/m3ISO 179/2C
Izod Notched Impact Strength (23°C)60J/mASTM D256
Izod Notched Impact Strength (-40°C)10ft-lb/inASTM D256
Izod Impact Strength (23°C)No BreakkJ/m²ISO 180/1U
Izod Impact Strength (-30°C)No BreakkJ/m²ISO 180/1U
Poisson's Ratio0.42-ASTM E132
Physical Properties
ValueUnitsTest Method / Conditions
Molding Shrinkage - Parallel1.8%ISO 294-4, 2577
Molding Shrinkage - Normal1.7%ISO 294-4, 2577
Thermal Properties
ValueUnitsTest Method / Conditions
Melting Temperature (10°C/min)225°CISO 11357-1/-3
Temperature of Deflection Under Load(1.8 MPa)50°CISO 75-1/-2
Temperature of Deflection Under Load (0.45 MPa)100°CISO 75-1/-2
Temperature of Deflection Under Load (0.45 MPa, Annealed)145°CISO 75-1/-2
Flammability
ValueUnitsTest Method / Conditions
FMVSS ClassB-ISO 3795 (FMVSS 302)
Burning Rate (1 mm, Thickness)38mm/minISO 3795 (FMVSS 302)
Other Properties
ValueUnitsTest Method / Conditions
Density1220kg/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
Fogging, G - Value (Condensate)0.1mgISO 6452
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

Regulatory & Compliance

Packaging & Availability