- Material or ingredients: Arabica & Robusta coffee beans - Specification: 17/18 screen (Standard, Clean, Wet Polished) Grade 1 S18 unwashed FAQ - On sieve screen 18: 90% min -Moisture:12.5% max - Foreign matter: 1% max - Black & Broken: 2% max Grade 1 S18 cleaned - On sieve screen 18: 90% min -Moisture:12.5% max - Foreign matter: 0.2% max - Black (0.1%) & Broken (0.5%): max Grade 1 S18 Wet Polished - On sieve screen 18: 90% min - Moisture: 12.5% max - Foreign matter: 0.2% max - Black (0.1%) & Broken (0.5%) max