Crastin® SK615SF BK591

Alternative and trade names
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ISO 7792-PBT,MGNR,09-100,GF30Common 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® SK615SF is a 30% glass fiber reinforced, low viscosity polybutylene terephtalate for injection molding. It has high flow characteristics and is specifically suitable for super fast production. It is laser markable.

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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23.0 °C

1.53 g/cm³

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ISO 1183



Elastic modulus

23.0 °C

9.9 GPa

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ISO 527-1/-2


23.0 °C

2.5 %

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ISO 527-1/-2

Impact strength, Charpy notched

23.0 °C

9 kJ/m²

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ISO 179/1eA

Poisson's ratio

23.0 °C

0.34 [-]

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Tensile strength

23.0 °C

145 MPa

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ISO 527-1/-2



Heat deflection temperature, 1.80 MPa

205 °C

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ISO 75-1/-2

Melting point

222 °C

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ISO 11357-1/-3 | 18°F/min


Burning Behav. at 60mil nom. thickn.: HB class, Thickness tested: 1.5 mm, Burning Behav. at thickness h: HB class, Thickness tested: 3 mm, Glow Wire Flammability Index, 120mil: 700 °C, FMVSS Class: B -, Burning rate, Thickness 1 mm: 78 mm/min

Rheological Properties



23.0 °C

0.3 %

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ISO 294-4, 2577

Shrinkage, transverse

23.0 °C

1.1 %

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ISO 294-4, 2577

Technological properties


30% Glass Fiber

Processing methods

Drying Recommended: yes, Drying Temperature: 120°C, Drying Time, Dehumidified Dryer: 2-4h, Processing Moisture Content: ≤0.04%, Melt Temperature Optimum: 240°C, Min. melt temperature: 235°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