Crastin® ST820 NC010 is an unreinforced, Super Tough polybutylene terephthalate resin for injection molding.
Polymer Name: Polybutylene Terephthalate (PBT), Thermoplastic Polyester
Processing Methods: Coating, Injection Molding, Extrusion
Additives Included: Mold Release Agent
Flexural Modulus: 1550.0 MPa
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Mechanical Properties
| Value | Units | Test Method / Conditions | |
| Tensile Modulus | 1700 | MPa | ISO 527-1/-2 |
| Yield Stress | 38 | MPa | ISO 527-1/-2 |
| Yield Strain | 7 | % | ISO 527-1/-2 |
| Flexural Modulus | 1550 | MPa | ISO 178 |
| Flexural Strength | 50 | MPa | ISO 178 |
| Stress (at Break, 50mm/min) | 30 | MPa | ISO 527-1/-2 |
| Nominal Strain (at Break) | min. 50 | % | ISO 527-1/-2 |
| Strain (at Break, 50mm/min) | 150 | % | ISO 527-1/-2 |
| Charpy Impact Strength (at 23°C) | N | kJ/m² | ISO 179/1eU |
| Charpy Impact Strength (at -30°C) | N | kJ/m² | ISO 179/1eU |
| Poisson's Ratio | 0.42 | - | - |
| Notched Charpy Impact Strength (at 23°C) | 85 | kJ/m² | ISO 179/1eA |
| Notched Charpy Impact Strength (at -30°C) | 10 | kJ/m² | ISO 179/1eA |
| Notched Charpy Impact Strength (at -40°C) | 10 | kJ/m² | ISO 179/1eA |
| Notched Izod Impact Strength (at 23°C) | 60 | kJ/m² | ISO 180/1A |
| Notched Izod Impact Strength (at -30°C) | 15 | kJ/m² | ISO 180/1A |
| Notched Izod Impact Strength (at -40°C) | 10 | kJ/m² | ISO 180/1A |
| Izod Impact Strength (at 23°C) | N | kJ/m² | ISO 180/1U |
| Izod Impact Strength (at -30°C) | N | kJ/m² | ISO 180/1U |
| Izod Impact Strength (at -40°C) | 270 | kJ/m² | ISO 180/1U |
| Hardness (Rockwell Scale R) | 104 | - | ISO 2039-2 |
Typical Properties
| Value | Units | Test Method / Conditions | |
| Resin Identification | PBT-HI | - | ISO 1043 |
Thermal Properties
| Value | Units | Test Method / Conditions | |
| Specific Heat Capacity of Melt | 2100 | J/(kg K) | - |
| Melt Temperature (at 10°C/min) | 225 | °C | ISO 11357-1/-3 |
| Glass Transition Temperature (at 10°C/min) | 55 | °C | ISO 11357-1/-2 |
| Temperature of Deflection Under Load (1.8 Mpa) | 50 | °C | ISO 75-1/-2 |
| Temperature of Deflection Under Load (0.45 Mpa) | 100 | °C | ISO 75-1/-2 |
| Temperature of Deflection Under Load (0.45 Mpa, Annealed) | 145 | °C | ISO 75-1/-2 |
| Vicat Softening Temperature (at 50°C/H 50N) | 125 | °C | ISO 306 |
| Coefficient of Linear Thermal Expansion (Parallel) | 147 | E-6/K | ISO 11359-1/-2 |
| Coefficient of Linear Thermal Expansion (Normal) | 155 | E-6/K | ISO 11359-1/-2 |
| Coefficient of Linear Thermal Expansion (Normal, at -40 to 23°C) | 108 | E-6/K | ISO 11359-1/-2 |
| Coefficient of Linear Thermal Expansion (Normal, at 55-160°C) | 191 | E-6/K | ISO 11359-1/-2 |
| Coefficient of Linear Thermal Expansion (Parallel, at -40 to 23°C) | 99 | E-6/K | ISO 11359-1/-2 |
| Coefficient of Linear Thermal Expansion (Parallel, at 55-160°C) | 233 | E-6/K | ISO 11359-1/-2 |
| Relative Thermal Index (Electrical, 0.75mm) | 75 | °C | UL 746B |
| Relative Thermal Index (Impact, 0.75mm) | 75 | °C | UL 746B |
| Relative Thermal Index (Strength, 0.75mm) | 75 | °C | UL 746B |
| TGA curve | available | - | ISO 11359-1/-2 |
| Thermal Conductivity of Melt | 0.2 | W/(m K) | ISO 22007-2 |
Electrical Properties
| Value | Units | Test Method / Conditions | |
| Surface Resistivity | 1000000000000000 | Ohm | IEC 62631-3-2 |
| Electric Strength | 27 | kV/mm | IEC 60243-1 |
| Relative Permittivity (at 1MHz) | 3.4 | - | IEC 62631-2-1 |
| Dissipation Factor (at 100 Hz) | 200 | E-4 | IEC 62631-2-1 |
| Dissipation Factor (at 1 MHz) | 190 | E-4 | IEC 62631-2-1 |
| Comparative Tracking Index | 600 | - | IEC 60112 |
| Volume Resistivity | min. 1E13 | Ohm.m | IEC 62631-3-1 |
Flammability
| Value | Units | Test Method / Conditions | |
| Oxygen Index | 19 | % | ISO 4589-1/-2 |
| FMVSS Class | B | - | ISO 3795 (FMVSS 302) |
| Burning Behavior (at 0.8mm Thickness) | UL94 HB | class | IEC 60695-11-10 |
| Glow Wire Flammability Index (at 2mm) | 700 | °C | IEC 60695-2-12 |
| Glow Wire Flammability Index (at 3mm) | 700 | °C | IEC 60695-2-12 |
| Burning Rate (at 1mm Thickness) | 38 | mm/min | ISO 3795 (FMVSS 302) |
Other Properties
| Value | Units | Test Method / Conditions | |
| Humidity Absorption (at 2mm) | 0.12 | % | Sim. to ISO 62 |
| Water Absorption (at 2mm) | 0.31 | % | Sim. to ISO 62 |
| Density of Melt | 1030 | kg/m³ | - |
| Density | 1220 | kg/m³ | ISO 1183 |
Processing Information (Extrusion)
| Value | Units | Test Method / Conditions | |
| Drying Temperature | 110 - 130 | °C | - |
| Drying Time (Dehumidified Dryer) | 2 - 4 | h | - |
| Processing Moisture Content | max. 0.04 | % | - |
| Melt Temperature Range | 240 - 260 | °C | - |
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 | - |
VDA Properties
| Value | Units | Test Method / Conditions | |
| Fogging (G-Value, Condensate) | 0.1 | mg | ISO 6452 |
Rheological Properties
| Value | Units | Test Method / Conditions | |
| Melt Mass Flow Rate (at 250°C, 5 kg) | 5 | g/10min | ISO 1133 |
| Mold Shrinkage (Parallel) | 2.4 | % | ISO 294-4, 2577 |
| Mold Shrinkage (Normal) | 1.9 | % | ISO 294-4, 2577 |
| Mold Shrinkage (Parallel, Annealed) | 2.5 | % | ISO 294-4 |
| Post Mold Shrinkage (Normal, 48h at 80°C) | 0.6 | % | ISO 294-4 |
| Post Mold Shrinkage (Parallel, 48h at 80°C) | 0.8 | % | ISO 294-4 |
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
OEM Standards
Technical Details & Test Data
Viscosity vs Shear Rate
Shear Stress vs Shear Rate
Stress vs Strain
Secant Modulus vs Strain
Stress vs Strain (Isochronous, 23°C)
Creep Modulus vs Time (23°C)
Tensile Modulus vs Temperature
Packaging & Availability
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Crastin® ST820 NC010
DuPont