Silver Plated Copper Clad Steel (SPCCS) commonly used for RF coaxial cables) as per ASTM-B-501Spiral multi-strands on glass-fibre cord for high linear resistance -- generally for heating applicationsPlain copper or Tinned copper can not be used due to high-temperature processing and applications; tin melts and flows into the interstices of stranding to make the conductor inflexible; copper tends to oxidize and become brittle
Silver Plated Copper (SPC) for use up to 200C (minimum 1 micron silver coating as per ASTM-B-298)Nickel Plated Copper (NPC) up to 260C (minimum 1.25 micron nickel coating as per ASTM-B-355)Silver Plated High Strength Copper Alloy (SPHSCA) for mechanical strength in fine cross-sections and for superior flex-life (somewhat lower conductivity than copper) generally as per ASTM-B-624Pure Nickel for use up beyond 260C; very high resistance to corrosion; DC resistance about 6 times that of copper at 20CResistance alloys for Thermo-Couple applications
Silver Plated Copper (SPC) for use up to 200C (minimum 1 micron silver coating as per ASTM-B-298)Nickel Plated Copper (NPC) up to 260C (minimum 1.25 micron nickel coating as per ASTM-B-355)Silver Plated High Strength Copper Alloy (SPHSCA) for mechanical strength in fine cross-sections and for superior flex-life (somewhat lower conductivity than copper) generally as per ASTM-B-624Pure Nickel for use up beyond 260C; very high resistance to corrosion; DC resistance about 6 times that of copper at 20CResistance alloys for Thermo-Couple applications