Colorimetric technology has been used for years in the determination of gas leaks. Each Chemlogic leak test tape has been specially formulated to detect Phosgene, Mineral Acids (HCL, HF, HBR etc.), Hydrides (Arsine, Phosphine, Diborane, Silane, H2S, etc.). Whether you are in a chemical plant checking fittings or a Semiconductor facility testing your cylinder hook up this makes the job quick and easy. Simply place the ChemLogic tape on the suspected leak area; if the tape turns color you have a leak. The ChemLogic tape detects PPB/PPM concentration. This is a low cost, effective technology to insure a good connection.