Copper tubing can be best cleaned by using

Copper tubing can be best cleaned by using

• A. acid
• B. steel wool
• C. sandpaper
• D. a file

Answer: (B)

Cleaning copper tubing for soldering requires removing oxide and contaminants so solder will wet the surface properly. Steel wool provides a mild abrasive that smooths away tarnish and oxidation without creating deep scratches, leaving a clean, bright surface ready for flux and solder to bond. Acid cleaning can etch the copper and leave residues that interfere with soldering, while sandpaper or a file are too aggressive and can remove too much material or leave gritty particles. For these reasons, steel wool is the best choice among the options.

Cleaning copper tubing for soldering requires removing oxide and contaminants so solder will wet the surface properly. Steel wool provides a mild abrasive that smooths away tarnish and oxidation without creating deep scratches, leaving a clean, bright surface ready for flux and solder to bond. Acid cleaning can etch the copper and leave residues that interfere with soldering, while sandpaper or a file are too aggressive and can remove too much material or leave gritty particles. For these reasons, steel wool is the best choice among the options.