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Dow ENDURANCE™ HFDK-4201 SC Datasheet

Crosslinkable Power Cable Insulation Compound

Supplied by The Dow Chemical Company

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Product Description
Super Clean Polyethylene Compound for High Voltage Power Cable Insulation

DOW ENDURANCE™ HFDK-4201 SC is a long-life, crosslinkable, low-density, polyethylene insulation compound of high purity developed especially for the insulation of High Voltage power cables. DOW ENDURANCE HFDK-4201 SC is equipped with a non-migrating stabilizer providing high thermal stability, long term storage stability, and optimum crosslinking behavior.

DOW ENDURANCE HFDK-4201 SC is recommended for the insulation of high voltage power transmission and distribution cables <220kV.

Cables insulated with DOW ENDURANCE HFDK-4201 SC would be expected to meet the requirements in the following standards when processed using state-of-the-art cable manufacturing practices:
  • IEC: 62067, 60840
  • CENELEC: HD 632 S2
  • AEIC: CS9
  • ANSI/ICEA: 108-720-2004
  • GB/T 11017 , GB/Z 18890
Material Status 
  • Commercial: Active
  • Africa & Middle East
  • Asia Pacific
  • Europe
  • High Voltage Insulation
  • Insulation
  • Underground Power Cable
  • Wire & Cable Applications
Agency Ratings 
  • Pellets
Nominal Value
Test Method
Density 2
ISO 1183
Melt Mass-Flow Rate (MFR) (130°C/2.16 kg)
g/10 min
ISO 1133
Moisture 3
Internal Method
Nominal Value
Test Method
Tensile Strength
IEC 60811-1-1
Tensile Elongation (Break)
IEC 60811-1-1
Nominal Value
Test Method
Hot Set 4
    IEC 811-2-1
Elongation under Load : 392°F
Permanent Deformation : 392°F
Nominal Value
Test Method
Change in Tensile Properties - 10 days (302°F)
IEC 60811-1-1
Nominal Value
Test Method
Volume Resistivity
IEC 60093
Electric Strength
IEC 60243-1
Dielectric Constant (1 MHz)
IEC 60250
Dissipation Factor (50 Hz)
IEC 60250
Additional Information
Nominal Value
Test Method
Gottfert Elastograph - Torque
ISO 6502
Reaction Speed - t90 (356°F)
ISO 6502
The cleanliness is assured through a number of precautions taken in during the manufacturing of the DOW ENDURANCE™ HFDK-4201 SC.
The specifications are set to exclude contaminants >100µm.

Stabilization system and color development:
The Dow ENDURANCE™ HFDK-4201 SC is equipped with a very efficient stabilization system, providing excellent stability against both thermal degradation and scorch. The stabilizer is compatible with PE and does not recrystallize in the end product. The result is cables without crystal contamination or sweat-out issues. Most AOs add color to plastic when exposed to heat. The interaction of the AO and peroxide in the HFDK-type XLPE generates a reddish-orange color in thermoplastic material. During crosslinking this, this color becomes totally transparent in the melt, or translucent white upon solidification. For thick walled cables and/or cables with higher heat exposure, a greenish-yellow color may appear. The strength of this color is increasing with the heat exposure. The coloration of the caused by the interaction of the AO and the peroxide does not involve the polymer. The ppm level of coloring agents measured in the plastic represents a fraction of a percent of the AO, and therefore does not influence the polymer, nor the AO itself. The performance and service life of the finished cable is therefore not affected by the color.

The environment or conditions of storage greatly influences the recommended storage time. Storage under extreme conditions may affect the quality, processing, or performance of the product. Storage should be in accordance with good manufacturing practices. The recommended storage conditions are dry conditions with temperatures between 50°F and 86°F (10°C and 30°C). When stored under these conditions, the product may be used by the customer for up to one year from the date of sale or two years from the date of manufacture, whichever comes first. It is recommended that the practice of using the product on a first-in / first-out basis be established.

DOW ENDURANCE™ HFDK-4201 SC can be delivered in Dow's UNICLEAN™ big bags, or in 1000 kg octabins.
Uses may also be described by the following terms: High Voltage Insulation, Wire and Cable Applications, Wire & Cable Applications.
Agency Ratings
This plastic material has 5 certifications from the following agencies (the number in parentheses shows the number of certifications for that agency): AEIC (1), HD (1), IEC (2), ICEA (1).
Available Documents
Technical Datasheet
Nominal Value
Melt Temperature
Extrusion Notes
DOW ENDURANCE™ HFDK-4201 SC provides excellent surface finish and outstanding output rates over a broad range of conditions. For optimum results, melt extrusion temperatures in the range of 115 -140°C are recommended, and preferably 135°C for HV applications.
If desirable DOW ENDURANCE HFDK-4201 SC allows the use of fine mesh screens (400mesh/65µm) without causing pressure build up over time. The use of 250 mesh screens (100µm) is common. Specific recommendations for processing conditions can be determined when the application and processing equipment type are known.

At start-up, it is recommended to use DFDK-4850 transition compound to achieve stable extruder conditions.
1Typical properties: these are not to be construed as specifications.
2Base Resin
3Karl Fischer titration
40.2 MPa
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The information presented on this datasheet was acquired by UL Prospector from the producer of the material. UL Prospector makes substantial efforts to assure the accuracy of this data. However, UL Prospector assumes no responsibility for the data values and strongly encourages that upon final material selection, data points are validated with the material supplier.