Crastin® ST820 BK503

Alternative and trade names
PBT-HI
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Description

Common features of Crastin® thermoplastic polyester resin include mechanical and physical properties such as stiffness and toughness, heat resistance, friction and wear resistance, excellent surface finishes and good colourability. Crastin® thermoplastic polyester resin has excellent electrical insulation characteristics and high arc-resistant grades are available. Many flame retardant grades have UL recognition (class V-0). Crastin® thermoplastic polyester resin typically has high chemical and heat ageing resistance. The good melt stability of Crastin® thermoplastic polyester resin normally enables the recycling of properly handled production waste.If recycling is not possible, DuPont recommends, as the preferred option, incineration with energy recovery (-24 kJ/g of base polymer) in appropriately equipped installations. For disposal, local regulations have to be observed. Crastin® thermoplastic polyester resin typically is used in demanding applications in the electronics, electrical, automotive, mechanical engineering, chemical, domestic appliances and sporting goods industry.Crastin® ST820BK503 is an unreinforced, Super Tough polybutylene terephthalate resin for injection molding.

This material data has been provided by Matmatch.

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

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Properties

General

PropertyTemperatureValueComment

Density

23.0 °C

1.22 g/cm³

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ISO 1183

Mechanical

PropertyTemperatureValueComment

Elastic modulus

23.0 °C

1.6 GPa

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ISO 527-1/-2

Elongation

23.0 °C

130 %

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ISO 527-1/-2 | 50mm/min

Elongation at yield

23.0 °C

7 %

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ISO 527-1/-2

Flexural modulus

23.0 °C

1.5 GPa

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ISO 178

Flexural strength

23.0 °C

50 MPa

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ISO 178

Impact strength, Charpy notched

-6.0 °C

10 kJ/m²

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ISO 179/1eA

23.0 °C

85 kJ/m²

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ISO 179/1eA

Impact strength, Izod unnotched

-40.0 °C

10 kJ/m²

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ISO 180/1A

23.0 °C

60 kJ/m²

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ISO 180/1A

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Poisson's ratio

23.0 °C

0.42 [-]

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Yield strength

23.0 °C

36 MPa

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ISO 527-1/-2

Impact strength, Charpy unnotched

No Break @ 23,-6°C, ISO 179/1eA

Impact strength, Izod notched

No Break @ 23,-30°C, ISO180/1A

Thermal

PropertyValueComment

Heat deflection temperature, 0.45 MPa

145 °C

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ISO 75-1/-2 | annealed

Heat deflection temperature, 1.80 MPa

50 °C

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ISO 75-1/-2

Melting point

225 °C

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ISO 11357-1/-3 | 18°F/min

Flammability

FMVSS Class: B -, Burning rate, Thickness 1 mm: 38 mm/min

Rheological Properties

PropertyTemperatureValueComment

Shrinkage

23.0 °C

1.8 %

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ISO 294-4, 2577

Shrinkage, transverse

23.0 °C

1.7 %

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ISO 294-4, 2577

Technological properties

Property
Processing methods

Drying Recommended: yes, Drying Temperature: 120°C, Drying Time, Dehumidified Dryer: 2-4h, Processing Moisture Content: ≤0.04%, Melt Temperature Optimum: 250°C, Min. melt temperature: 240°C, Max. melt temperature: 260°C, Mold Temperature Optimum: 80°C, Min. mold temperature: 30°C, Max. mold temperature: 130°C, Hold pressure range: ≥60MPa, Hold pressure time: 3s/mm, Back pressure: As low as possible, Ejection temperature: 170°C