Hytrel® HTR237BG BK320

Alternative and trade names
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Common features of Hytrel® thermoplastic polyester elastomer include mechanical and physical properties such as exceptional toughness and resilience, high resistance to creep, impact and flex fatigue, flexibility at low temperatures and good retention of properties at elevated temperatures. In addition, it resists many industrial chemicals, oils and solvents. Special grades include heat stabilised, flame retardant, food contact compliant, blow molding and extrusion grades. Concentrates offered include black pigments, UV protection additives, heat stabilisers, and flame retardants. Hytrel® thermoplastic polyester elastomer is plasticiser free.The good melt stability of Hytrel® thermoplastic polyester elastomer 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. Hytrel® thermoplastic polyester elastomer typically is used in demanding applications in the automotive, fluid power, electrical/electronic, consumer goods, appliance and power tool, sporting goods, furniture, industrial and off-road transportation/equipment industry.Hytrel® HTR237BG is designed for blow molding or processing techniques requiring high viscosity. It has nominal durometer hardness of 45D, is pigmented black with fine particle size carbon black and contains a general purpose stabilizer.

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

1.15 g/cm³

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ISO 1183



Elastic modulus

23.0 °C

0.09 GPa

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ISO 527-1/-2


23.0 °C

300 %

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min. | ISO 527-1/-2

Flexural modulus

23.0 °C

0.09 GPa

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ISO 178

Hardness, Shore D

23.0 °C

45 [-]

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max., ISO 7619-1

Impact strength, Charpy notched

-40.0 °C

119 kJ/m²

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No Break @ 23°C, ISO 179/1eU

Tear strength

23.0 °C

117 kN/m

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ISO 34-1

Tear strength, transverse

23.0 °C

119 kN/m

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ISO 34-1

Tensile strength

23.0 °C

30 MPa

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ISO 527-1/-2

Impact strength, Izod unnotched

No Break @23,-40°C, ISO 180/1A



Brittleness temperature

-100 °C

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ISO 974

Glass transition temperature

-45 °C

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ISO 11357-1/-2 | 18°F/min

Heat deflection temperature, 0.45 MPa

57 °C

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ISO 75-1/-2

Heat deflection temperature, 1.80 MPa

41 °C

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ISO 75-1/-2

Melting point

204 °C

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ISO 11357-1/-3 | 18°F/min

Vicat softening temperature

164 °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

0.4 g/10min

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ISO 1133 | 220°C/10kg

Melt volume-flow rate

4 cm³/10min

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ISO 1133

Technological properties


Carbon Black

Processing methods

Drying Recommended: yes, Drying Temperature: 100°C, Drying Time, Dehumidified Dryer: 2-3h, Processing Moisture Content: ≤0.08%, Melt Temperature Optimum: 225°C, Min. melt temperature: 220°C, Max. melt temperature: 250°C