Thermo-Trap Putty is a reusable putty material that is referred to as a heat sink. Thermo-Trap keeps components protected and cooler much better than a traditional wet rag. When applied to the metal working surface, Thermo-Trap soaks up heat and reduces heat transfer to protect sensitive components. Apply to copper, steel, or other pipe surfaces before welding, brazing, or soldering to protect nearby sensitive controls or components. Thermo-Trap Putty also protects adjacent surface areas from over-heating or damage prior to welding, brazing or soldering.