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GenNex® 77N

GenNex® 77N

Code: 3302 (CV), 3503 (E-Beam)

Download Safety Data Sheet
Download Data Sheet

GenNex 77N is a halogen free flame-retardant primary insulation compound that will pass long term insulation resistance at 90 C, VW-1 & glancing impact, meeting the requirements of UL 44 Type XHHW-2. In addition, it also meets the requirements of UL44 Type RHH/RHW, CSA RW-90, IEX 60092-351 and IE EE 1580 Type LSX. It is available in both radiation and CV cure options.

The GenNex 77N Low Smoke Zero Halogen Insulation compound has been competitively priced to provide you a high-quality cost-effective insulation material to assist our customers with new market penetration right out of the gate.


  • Ease of Processing
  • Excellent Flame Performance
  • Halogen Free
  • Excellent Physical Properties
  • Colourable
  • Meets VW-1 on 14awg wire


  • Density: 1.51 g/cm3
  • Tensile: 2000 psi (typical)
  • Elongation: 175% (Typical)
  • Durometer: 92 Shore A


  • Insulation Resistance @ 15 oC: 6500 MΩ∙kft
  • Capacitance & Relative Permittivity @ 90 oC
    • SIC (24h): 3.9 (UL2556)
    • Capacitance Increase, 1-14 days: 0.5%
    • Capacitance Increase, 7-14 days: 0.3%
    • Stability Factor: <1
  • Long Term Insulation Resistance in Water @ 90 oC: Pass (UL2556)


Limited Oxygen Index (LOI): 39%

  • VW-1: Pass (UL1581)

HEAT AGING (0.7d@121oC)

  • Tensile Retention: 100%
  • Elongation Retention: 100%

FLUID RESISTANCE (IRM 902 – 96h @ 100oC)

  • Tensile Retention: 65%
  • Elongation Retention: 135%


  • Extruder L/D: 15:1 or 20:1
  • Comp. Ratio: 1.25:1
  • Screen Pack: 20 Mesh or None
  • Screw Type: Single Flight metering, without mixing section
  • Feed Zone: 190oF
  • Center Zone: 210F
  • Head/Die: 230F
  • Screw Cooling: 165F
  • Die Cooling: Recommended
  • Gradient Cooling: Not Applicable
  • Color Concentrate: EVA Binder preferred


GenNex® 77 Series of primary insulation compounds have been designed to process easily on standard extruders used in the production of wire and cable products. These materials are designed to process similar to elastomeric compounds, attaining maximum output levels at relatively low shear rates. Care should be taken to ensure that screw compression ratio levels are below 1.5:1, and flow restrictions in the crosshead are kept to a minimum. Melt temperature values above 260oF (125oC) should be avoided.

The material can be extruded using either pressure or sleeving techniques. For generation of optimum physical properties, a drawdown ratio of 1.15:1 can be used. Conductor preheating is recommended, with a suggested temperature of 150oF (65oC).
The GenNex 77 can be colored in line, however for maximum resistance to flame, it is recommended the material be supplied pre-pigmented to minimize the combustible material in the final compound.

All materials are supplied as free flowing pellets, packaged in sealed foil lined boxes and do not need to be dried prior to use. It is recommended that the foil liners be resealed after use to prevent outside contamination or water absorption during storage. If the material has been exposed to a high humidity environment, or the foil liner has not been sealed, it is recommended the material be dried for a minimum of 4 hours at 140oF (60oC) in a standard desiccant style dryer prior to use.

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