The International Electrotechnical Commission has published the IEC 61196-10 standard. IEC 61196-10 ed1.0 applies to “Coaxial communication cables – Part 10: Sectional specification for semi-rigid cables with polytetrafluoroethylene (PTFE) dielectric.” The standard is available for purchase on the IEC’s website.
“IEC 61196-10:2014(E) applies to semi-rigid coaxial communication cables with polytetrafluoroethylene (PTFE) dielectric and tubular outer conductor. These cables are intended for use in microwave and wireless equipments or other signal transmission equipments or units at frequencies above 500 MHz. It is to be read in conjunction with IEC 61196-1:2005.”
*Description from IEC website