Ashirvad Aqualife Systems do not support combustion and are therefore ideally suited for use in buildings and houses, exclusively for cold water pipelines. uPVC must be forced to burn due to its High Limiting Oxygen Index (LOI) of 45. LOI is the percentage of oxygen needed in an atmosphere to support combustion. Since the Earth’s atmosphere is only 21% oxygen, uPVC will not burn unless a flame is constantly applied, and stops burning when the ignition source is removed.