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.