Loss on Ignition (LOI)
PWT’s Membrane Forensics’ LOI Test is used to determine the relative percentages by weight of organic portion to inorganic portion of the foulant.
During the LOI test, our technicians dry the foulant sample at 110ºC and heat the foulant to 550ºC. This procedure destroys the organic material in the sample. A weight loss on ignition is then calculated from foulant weights measured before and after exposure to the higher temperature.
The LOI is referred to as a percentage of the foulant sample and is representative of the organic portion of the foulant. The remaining percentage (that which is not burned off) percentage is the inorganic portion of the sample.