Low Activity No Halogen Added No-Clean: While very small amounts of halogen (<500ppm) are perfectly fine and considered halogen-free for virtually all electronic assemblies, some electronic assemblers want a formula that eliminates as much halogen as possible. CW-802 was created with this in mind. However, it is recommended only for applications where no halogen is a must, the surfaces to be soldered are in pristine condition, and the process is well-controlled.