HDPE compound for use in gas-injected foam insulation for coaxial/RF cables requiring low dissipation factor performance and compatibility with LDPE. It has excellent electrical properties and toughness, as well as the needed stabilization for these applications. It is commonly used in combination with LDPE compounds such as AXELERON™ CX 1258 NT Telecom Cable Compound and AXELERON™ CX 1253 NT Telecom Cable Compound. To obtain optimal cellular structure, an additional 0.1% to 0.3% of a suitable nucleating agent is recommended such as those in AXELERON™ CX A-0012 NT Telecom Cable Compound and AXELERON™ CX 0078 NT Telecom Cable Compound master batches.