When evaluating Silver Yarn, the most critical factor is the silver content and coating method. You should distinguish between pure silver fiber (where a layer of silver is permanently bonded to a nylon or polyester core) and silver-plated yarn. For high-end applications, look for a silver purity of 99.9%. Additionally, verify the electrical conductivity, typically measured in surface resistivity (Ohms/cm); for effective EMI shielding or antibacterial properties, a resistivity of <10 Ohms/cm is often required. Lastly, check the denier (D) and filament count to ensure it meets your textile strength and softness requirements.