Hytrel® HTR8745 BK320

Alternative and trade names
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Hytrel® HTR8745 BK320 is a 45 Shore D, Heat Stabilized, Black, High Performance High Flow Polyester Elastomer with Excellent Fatigue Resistance Developed for Blow 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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23.0 °C

1.14 g/cm³

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ISO 1183



Elastic modulus

23.0 °C

0.08 GPa

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ISO 527-1/-2


23.0 °C

500 %

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ISO 527-1/-2

Hardness, Shore D

23.0 °C

45 [-]

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max., ISO 7619-1

Tear strength

23.0 °C

120 kN/m

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ISO 34-1

Tear strength, transverse

23.0 °C

120 kN/m

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ISO 34-1

Tensile strength

23.0 °C

34 MPa

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ISO 527-1/-2

Impact strength, Charpy notched

No Break @ -6,-40°C, ISO 179/1eA

Impact strength, Izod unnotched

No Break @ -40°C,ISO 180/1A



Melting point

203 °C

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ISO 11357-1/-3 | 18°F/min

Vicat softening temperature

160 °C

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ISO 306 | 90°F, 2 lbf


FMVSS Class: B -, Burning rate, Thickness 1 mm: <80 mm/min

Rheological Properties


Melt mass-flow rate

6.5 g/10min

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ISO 1133 | 230°C/10kg

Shrinkage, transverse

23.0 °C

1.8 %

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ISO 294-4, 2577

Technological properties

Processing methods

Drying Recommended: yes, Drying Temperature: 110°C, Drying Time, Dehumidified Dryer: 2-4h, Processing Moisture Content: ≤0.08%, Melt Temperature Optimum: 240°C, Min. melt temperature: 230°C, Max. melt temperature: 250°C, Mold Temperature Optimum: 45°C, Min. mold temperature: 45°C, Max. mold temperature: 55°C