Rothenberger Industrial Solder Solder, lead-free 627426 - Rothenberger Industrial 1000002351, Rothenberger Industrial Unleaded Radio Solder 70g Solder, which is lead-free and composed of SN99Cu1. This soldering wire is suitable for various soldering applications, providing a reliable connection without the use of lead. Typical uses include plumbing, electronics, and general repairs due to its environmentally friendly composition. Rothenberger 1000002351 Lead-Free Solder 70g SN99Cu1