Hytrel® 4068

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® 4068 is a low modulus Hytrel® grade with nominal durometer hardness of 40D. It contains non-discoloring stabilizer. It can be processed by many conventional thermoplastic processing techniques like injection molding and extrusion.Typical applications: Moulded products, hose and tubing, wire and cable jackets, film and sheeting, belting and seals.

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

1.11 g/cm³

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ISO 1183

Water absorption

23.0 °C

0.7 %

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Sim. to ISO 62 | Immersion 24h



Elastic modulus

23.0 °C

0.05 GPa

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ISO 527-1/-2


23.0 °C

800 %

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ISO 527-1/-2

Flexural modulus

23.0 °C

0.05 GPa

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ISO 178

Hardness, Shore D

23.0 °C

37 [-]

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max., ISO 7619-1

Tear strength

23.0 °C

100 kN/m

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ISO 34-1

Tear strength, transverse

23.0 °C

103 kN/m

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ISO 34-1

Tensile strength

23.0 °C

29 MPa

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ISO 527-1/-2

Impact strength, Charpy notched

No Break @ 23,-6,-40°C, ISO 179/1eA

Impact strength, Charpy unnotched

No Break @ 23,-6°C, ISO 179/1eA



Coefficient of thermal expansion

23.0 °C

2.3E-4 1/K

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ISO 11359-1/-2

Coefficient of thermal expansion, transverse

23.0 °C

2.3E-4 1/K

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ISO 11359-1/-2

Glass transition temperature

-55 °C

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ISO 11357-1/-2 | 18°F/min

Melting point

193 °C

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ISO 11357-1/-3 | 18°F/min

Specific heat capacity

23.0 °C

2140 J/(kg·K)

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of melt

Thermal diffusivity

23.0 °C

0 mm²/s

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Vicat softening temperature

130 °C

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ISO 306 | 90°F, 2 lbf


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



Comparative tracking index

23.0 °C

600 V

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IEC 60112

Dielectric constant, 100Hz

23.0 °C

4.8 [-]

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IEC 62631-2-1

Dielectric constant, 1MHz

23.0 °C

4.7 [-]

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IEC 62631-2-1

Dielectric strength

23.0 °C

18 kV/mm

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IEC 60243-1

Rheological Properties


Melt mass-flow rate

8.5 g/10min

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ISO 1133 | 220°C/2.16kg

Melt volume-flow rate

8.8 cm³/10min

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ISO 1133


23.0 °C

1 %

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ISO 294-4, 2577

Shrinkage, transverse

23.0 °C

0.9 %

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ISO 294-4, 2577

Technological properties

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, Mold Temperature Optimum: 40°C, Min. mold temperature: 30°C, Max. mold temperature: 40°C