This Part2-38 of EN50290 gives specific requirements for Polypropylene (PP) compounds to be used for the insulation of coaxial cables. It is to be read in conjunction with EN50290‑2‑20 , EN50117 and other applicable product standards. Grades PP-S1 and PP-F1 correspond to materials specified in the previous version 50290-2-25. These relatively soft Polypropylene compounds have good low temperature properties and are highly stabilized. Grades PP-S2 and PP-F2 exhibit properties more typical of Polypropylene and are designed for general Coax applications where high crush resistance and superior dielectric properties are needed. Using raw material and type test data as outlined in this standard, the raw material supplier will have sufficient data to demonstrate compliance and warrant that the material is suitable for the specified application.