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Crastin® SK645FR BK851

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Polymer Name: Polybutylene Terephthalate (PBT), Thermoplastic Polyester
Processing Methods: Injection Molding
Fillers Included: Glass Fiber
Additives Included: Flame Retardant
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Identification & Functionality

Additives Included
Chemical Family
Fillers Included
Plastics & Elastomers Functions
Technologies

Crastin® SK645FR BK851 Features & Benefits

Materials Features

Applications & Uses

Properties

Mechanical Properties
ValueUnitsTest Method / Conditions
Tensile Modulus11000MPaASTM D638
Stress at Break110MPaISO 527-1/-2
Strain at Break2.6%ISO 527-1,2
Flexural Strength180MPaASTM D 790
Charpy Impact Strength (23°C)50kJ/m2ISO 179/1eU
Charpy Impact Strength (-30°C)50kJ/m2ISO 179/1eU
Charpy Notched Impact Strength (23°C)8kJ/m2ISO 179/1eA
Charpy Notched Impact Strength (-30°C)8kJ/m2ISO 179/1eA
Poisson's Ratio0.34-ASTM E132
Physical Properties
ValueUnitsTest Method / Conditions
Viscosity Number100cm³/gISO 307, 1157, 1628
Molding Shrinkage - Parallel0.4%ISO 294-4
Molding Shrinkage - Normal1.2%ISO 294-4
Thermal Properties
ValueUnitsTest Method / Conditions
Melting Temperature (10°C/min)225°CISO 11357-1/-3
Relative Temperature Index - Electrical (0.75 mm)140°CUL 746B
Relative Temperature Index - Electrical (1.5 mm)140°CUL 746B
Relative Temperature Index - Electrical (3 mm)140°CUL 746B
Relative Temperature Index - Electrical (6 mm)140°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 - Impact (6 mm)130°CUL 746B
Relative Temperature Index - Strength (0.75 mm)140°CUL 746B
Relative Temperature Index - Strength (1.5 mm)140°CUL 746B
Relative Temperature Index - Strength (3 mm)140°CUL 746B
Relative Temperature Index - Strength (6 mm)140°CUL 746B
Electrical Properties
ValueUnitsTest Method / Conditions
Electric Strength28kV/mmIEC 60243-1
Flammability
ValueUnitsTest Method / Conditions
Burning Behaviour (1.5 mm, Nominal Thickness)V-0classIEC 60695-11-10
Burning Behaviour (Thickness h)V-0classIEC 60695-11-10
Oxygen Index31%ISO 4589
FMVSS ClassDNI-ISO 3795 (FMVSS 302)
Ul RecognitionYes-UL 94
Thickness Tested1.5mmIEC 60695-11-10
Other Properties
ValueUnitsTest Method / Conditions
Density of Melt1420kg/m³-
Density1690kg/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-
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

Certifications & Compliance
Compliance
UL Flame Rated

Technical Details & Test Data

Viscosity vs Shear Rate

DuPont Crastin SK645FR BK851 Viscosity vs Shear Rate

Shear Stress vs Shear Rate

DuPont Crastin SK645FR BK851 Shear Stress vs Shear Rate

Specific Volume Temperature (pvT)

DuPont Crastin SK645FR BK851 Specific Volume Temperature (pvT)

Packaging & Availability

Regional Availability

Crastin® SK645FR BK851
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