Vamac® Ethylene Acrylic Elastomer for Wire and Cable Applications

Article | Mar, 25 2021
DuPont™ Vamac® Ethylene Acrylic Elastomer for Wire and Cable Applications


Halogen-Free and Flame Retardant (HFFR or NHFR) materials are important for applications that require fire safety – Wire & Cable and other molded parts for example, and flooring in the transportation sector.

DuPont™ Vamac® ethylene acrylic elastomer is not inherently resistant to burning. However, when properly compounded, a wire jacket of Vamac® will pass the demanding UL-44 vertical wire flame test, generating very low smoke compared to other flame-resistant materials and provide non-halogen off-gases in fire situations.


DuPont™ Vamac® compounds have proven records in flame retardant applications to provide an excellent characteristic combination of:

  • Oil resistance
  • Heat resistance
  • Good low temperature flexibility
  • Non-halogenated

Vamac® DP or Ultra DX are usually preferred for HFFR compounds. They provide more stable compound viscosity and better heat aging properties



DuPont™ Vamac® compounds offer low smoke and low toxicity cables applications in a vast array of industries, which include

  • HEV / EV Battery Cable
  • Rolling Stock Cable
  • Airplane Cable
  • Mining Cable
  • Off-Shore Oil Platform Cable
  • Marine Cable
  • Military Applications (e.g. submarine, fighter plane)

General Properties and Processing

DuPont™ Vamac® compounds possess extraordinary advantages in both properties and processing.

  • Flexibility at RT and Low Temperature (75-95 Shore A)
  • High Temperature Resistance (Class C, D 125°C - 150°C)
  • Resistance to Variety of Fluids (lubricants, diesel, battery acids, engine coolant, salt water and various oils, etc.)
  • Good Abrasion Resistance and Electrical Resistivity (>1012 Ohm-cm)
  • Ozone and Weather Resistance
  • Ease of Processing  (Fast extrusion speed with smooth surface)
  • Curing Flexibility (CV or E-Beam)
  • Colorful and Applicable to Thin-Wall

And especially, for fire related properties they are:

  • Non-halogenated
  • Flame Retardant (LOI > 35, UL-94 V-0)
  • Low Smoke Generation 
  • Low Fire Hazard / Toxic Gas

Vamac® characters in heat and oil resistance


Special grades of Hytrel® thermoplastic polyester elastomer include heat stabilized, flame retardant. Concentrates include black pigments, UV protection additives, heat stabilizers and flame retardants.


Vamac® product portfolio & grades

Recommendation for S&G, Molded Air Duct

  • G, GLS, Ultra IP, Ultra LS
  • High cross-link density
  • Ultra grades for better physical properties, hot demolding
  • Stable modulus during life cycle (ageing)
  • ‘LS’ = low swell, higher MA

Recommendation for Extruded Hoses & Dynamic Applications

  • GXF, Ultra XF, Ultra HT, Ultra HT-OR
  • Low cross-link density
  • Ultra grades for better physical properties,
  • Intermediate viscosity grade (Ultra XF) for larger processing window
  • ‘OR’ = oil resistance, higher MA

Special Grades 

  • Dipolymer DP and Ultra DX
  • Low temperature polymer VMX4017
  • VMX5000 for higher heat resistance