Visico LE4423/LE4437 is a scorch retardant, moisture-crosslinking polyethylene compound for low voltage insulation

The combination of a VISICO base material, LE4423, and a tin catalyst masterbatch, LE4437, provides a highly scorch retardant compound with excellent thermal stability. LE4423/LE4437 contains a patented scorch retardant additive (SRA) that increases the processing window for a moisture crosslinking compound and minimizes the tendency for premature crosslinking in the extruder, head or die.
LE4437 should be added to LE4423 directly in the extruder hopper by dry blending a ratio of 5 parts LE4437 to 95 parts LE4423. LE4437 also provides, in addition to catalyst, a stabilizaton package containing suitable antioxidants, a metal passivator and a metal deactivator. Properly mixed, during the extrusion process, LE4423/LE4437 exhibits excellent thermal stability to oxidation.

LE4423/LE4437 is readily pigmented to a variety of colors using standard wire & cable concentrates designed for thermoplastic or crosslinked polyethylene. UV weather resistance is obtained by the addition of a suitable carbon black or UV additive. Using VISICO LE4432 in place of LE4437 combines a tin catalyst along with the proper carbon black to provide a black, UV resistant, moisture crosslinking cable insulation.

Specifications
Visico LE4423/LE4437 meets the applicable requirements as below when processed using sound extrusion
practice and testing procedure:

• Underwriters Laboratories Standards 854 for types USE and USE-2

• EC 502

• NBN C 33-321

• Canadian Standards Association C22.2 No. 1790-00-Airport Series Lighting Cables and C22.2 No. 38 Cable Type RW-90

• NF C33-210

• HD 603 S1

• NF C32-090

• ASTM D 2655

Contact your Borealis representative for additional information.