LOX-8 Plumbers Putty is a chemical-resistant putty engineered for use with caustic chemicals, acids, and alkaline. A mineralized inorganic PCTFE/PTFE chemistry for waterproof seals between any two rigid surfaces. Provides superior performance. LOX-8 Plumbers Putty is VOC-free and silicone-free. ** Please note that due to the specific requirements, Lox-8 is a non-returnable item.