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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
DOW ENDURANCE™ HFDK-4201 SC is a long-life, unfilled, crosslinkable, low density, super clean polyethylene insulation compound developed especially for the insulation of high voltage power cables. DOW ENDURANCE™ HFDK-4201 SC has been designed with a non-migrating stabilizer providing high thermal stability, long term stability and optimum crosslinking behavior. It has an enhanced degree of scorch retardance for fine mesh filtering and long production run lengths during cable manufacture.

DOW ENDURANCE HFDK-4201 SC is recommended for the insulation of high voltage power transmission cables rated up to 230 kV

HFDK-4201 SC is designed for use in power distribution and transmission cables. Cables insulated with HFDK-4201 SC, using sound commercial manufacturing practice, would be expected to meet the latest editions of the following specifications and regulations:

  • IEC 62067, 60840
  • CENELEC HD632 S2
  • AEIC CS9
  • ANSI/ICEA: S-108-720
  • 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 (73°F)
Internal Method
Nominal Value
Test Method
Tensile Strength
Tensile Elongation (Break)
Nominal Value
Test Method
Hot Set
    IEC 811-2-1
Elongation under Load : 392°F
Elongation without Load : 392°F
Nominal Value
Test Method
Change in Tensile Properties - 7 days (320°F)
Nominal Value
Test Method
Volume Resistivity (73°F)
Dielectric Strength
    ASTM D149
0.125 in 2
0.125 in 3
0.125 in 4
Dielectric Constant (73°F)
Dissipation Factor (73°F)
Additional Information
(1)Nominal property values representing tests on molded, stress-relieved slabs. Cure times were 15 minutes at 175°C. Values are typical, and not to be construed
as specifications.
(2)Tests are made in accordance with current ASTM, IEC, ISO or Dow Methods.

Cleanliness Requirements
DOW ENDURANCE™ HFDK-4201 SC meets very high standards for cleanliness (super clean) established for an unfilled, crosslinkable cable insulation compound. Throughout the production process, the product is tested to ensure a high level of cleanliness. Extruded tapes are scanned by an automatic inspection system in a clean room. The purity data is managed using an acceptance sampling procedure, which ensures that the product meets or exceeds Dow super-clean standards.

Processing Techniques
DOW ENDURANCE™ HFDK-4201 SC provides excellent performance and outstanding output rates over a range of extrusion conditions. For optimum results, melt extrusion temperatures in the range of 115°C to 135°C (240°F to 275°F) are recommended. Screen packs are recommended if there is a need to improve the homogenization of the melt or as protection from contamination entering the extrusion process during product unloading and processing. At a minimum, the use of a 100-60-40-20 mesh screen pack is commonly used. It is recommended that melt pressure and optionally melt temperature be monitored during cable production. Prior to cable production, processing conditions, melt temperatures and melt pressures should be established by compound bleeding trials. During start up it is recommended to use the thermoplastic peroxide free compound in order to achieve stable extrusion conditions. Specific processing recommendations can only be made when information about the application and actual extrusion and processing equipment types are known.

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, in the original unopened packages, are dry conditions with temperatures between 50°F and 104°F (10°C and 40°C). When stored between 50°F and 86°F (10°C and 30°C), 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. The recommended maximum storage time is 1 year at 104°F (40°C). 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 different packaging types dependent on the specific material handling needs. This includes 500kg UNICLEAN™ octabins, 500kg bottom unloading octabins or in 1000kg bottom unloading octabins. Please consult with your local Dow sales representative to discuss your packaging needs.
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 7 certifications from the following agencies (the number in parentheses shows the number of certifications for that agency): ICEA (1), GB/T (1), AEIC (1), GB/Z (1), HD (1), IEC (2).
Available Documents
Technical Datasheet
1Typical properties: these are not to be construed as specifications.
2Method A (Short-Time)
3Method B (Step-by-Step)
4Method C (Slow Rate-of-Rise)
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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.