Material Notes:
ApplicationsPETROTHENE 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 TechniquesXL 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 SuggestionsMaximum screen pack of 40 meshLittle or no die landNo predrying normally requiredCompression ratio of 2:1-3:1"Mixing" screw can be used if properly designed to prevent excessive heat build-upDies should be cleaned frequently to reduce compound build-upApproximately 20% oversize dies are recommendedThe die area should be cooled up to 20°F by hot water or oil to reduce die build-upConductors should be cleaned or flame treated to remove any trace drawing oils prior to extrusionChemical or taped separators may be necessary to provide peelable adhesion over certain conductor typesCuring line steam temperature should be at least 400°F (205°C)Residence time in the steam should be at least 25 secondsPhysical PropertiesAll 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.This product is from the former Equistar product line.
