Hytrel® HTR8341C 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® HTR8341C BK320 is designed for blow molding or processing techniques requiring high melt viscosity. It has nominal hardness of 40D, is pigmented black with fine particle size carbon black, and contains a general purpose stabilizer. It shows excellent mechanical properties at elevated temperatures, superior fatigue, abrasion, and grease resistance.

This material data has been provided by Matmatch.

"Typical" values were obtained via a literature search. "Predicted" values were imputed via artificial intelligence technology. While we have placed significant efforts in ensuring data accuracy, "typical" and "predicted" data should be considered indicative and verified by appropriate material testing. Please do contact us if additional information on the the predicted data method is required.
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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Coefficient of friction

0.2 [-]

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ASTM 1894 | against steel


23.0 °C

1.14 g/cm³

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ISO 1183

Water absorption

23.0 °C

0.5 %

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Sim. to ISO 62 | 80mil



Elastic modulus

23.0 °C

0.08 GPa

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ISO 527-1/-2


23.0 °C

350 %

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ISO 527-1/-2

Flexural modulus

23.0 °C

0.08 GPa

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ISO 178

Hardness, Shore D

23.0 °C

40 [-]

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max., ISO 7619-1

Poisson's ratio

23.0 °C

0.49 [-]

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Tear strength

23.0 °C

110 kN/m

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ISO 34-1

Tear strength, transverse

23.0 °C

115 kN/m

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ISO 34-1

Tensile strength

23.0 °C

28 MPa

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ISO 527-1/-2

Impact strength, Charpy notched

No Break @ 23,-40°C, ISO179/1A

Impact strength, Charpy unnotched

No Break @ 23,-6°C, ISO 179/1eA

Impact strength, Izod unnotched

No Break @ 23°C, ISO 179/1eU



Brittleness temperature

-100 °C

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ISO 974

Coefficient of thermal expansion

23.0 °C

2.3E-4 1/K

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ISO 11359-1/-2 | -40 - 23°C

Coefficient of thermal expansion, transverse

23.0 °C

2.4E-4 1/K

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ISO 11359-1/-2 | -40 - 23°C

Glass transition temperature

-40 °C

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ISO 11357-1/-2 | 18°F/min

Heat deflection temperature, 0.45 MPa

56 °C

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ISO 75-1/-2

Heat deflection temperature, 1.80 MPa

42 °C

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ISO 75-1/-2

Melting point

207 °C

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ISO 11357-1/-3 | 18°F/min

Specific heat capacity

23.0 °C

2100 J/(kg·K)

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of melt

Thermal diffusivity

23.0 °C

0 mm²/s

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Vicat softening temperature

158 °C

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ISO 306 | 90°F, 2 lbf


FMVSS Class: B -, Burning rate, Thickness 1 mm: 17 mm/min



Comparative tracking index

23.0 °C

600 V

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IEC 60112

Dielectric strength

23.0 °C

19 kV/mm

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IEC 60243-1

Dissipation factor, 100Hz

23.0 °C

0.03 [-]

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IEC 62631-2-1

Dissipation factor, 1MHz

23.0 °C

9.5E-3 [-]

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IEC 62631-2-1

Surface resistivity

23.0 °C

4.00E+14 Ω/sq

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IEC 62631-3-2

Volume resistivity

23.0 °C

8.00E+12 Ω·cm

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IEC 62631-3-1

Rheological Properties


Melt mass-flow rate

0.9 g/10min

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ISO 1133 | 230°C/2.16kg


23.0 °C

1.6 %

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ISO 294-4, 2577

Shrinkage, transverse

23.0 °C

1.5 %

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ISO 294-4, 2577

Technological properties


Carbon Black

Processing methods

Drying Recommended: yes, Drying Temperature: 100°C, Drying Time, Dehumidified Dryer: 3-4h, 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: 40°C, Max. mold temperature: 50°C, Ejection temperature: 145°C