Equistar Petrothene® XL07407 Copolymer

Subcategory: Polyolefin; Thermoset; Equistar Wire and Cable Grade

Key Words: Automotive SAE J1128; Appliance Wire 125°C; Non-halogenated; Non-tarnishing

Material Notes:


Applications
PETROTHENE XL 07407 is especially formulated for use in flame retardant, primary insulation for low voltage automotive wire and cable applications (SAE J1128), and for UL applications including 125°C appliance wire and SIS. XL 7407 is a non-tarnishing, non-halogenated, flame retardant, chemically crosslinkable compound. Non-discoloring antioxidant and special active peroxide have been added to ensure thermal stability during processing and optimum curing results.

Processing Techniques
XL 07407, like other crosslinkable polyolefin compounds, can be extruded as wire and cable insulation by means of a conventional extruder with a continuous vulcanization tube. Below are suggested extrusion conditions for XL 07407. These conditions are intended as general guidelines only and are not optimum values, since manufacturing variables such as extruder type and size, continuous vulcanization tube design and cable construction all have an effect on processing of crosslinkable compounds.

Additional Suggestions
Maximum screen pack of 40 mesh
Little or no die land
No predrying normally required
Compression ratio of 2:1-3:1
"Mixing" screw can be used if properly designed to prevent excessive heat build-up
Dies should be cleaned frequently to reduce compound build-up
Approximately 20% oversize dies are recommended
The die area should be cooled up to 20°F by hot water or oil to reduce die build-up
Conductors should be cleaned or flame treated to remove any trace drawing oils prior to extrusion
Chemical or taped separators may be necessary to provide peelable adhesion over certain conductor types
Curing line steam temperature should be at least 400°F (205°C)
Residence time in the steam should be at least 25 seconds

Physical Properties
All properties determined from compression molded, press cured plaques. The values listed for physical and electrical properties are nominal values only and are subject to normal variations consistent with the test methods and/or variations found acceptable to the industry.