CRI Testing Program - Soil Removal

Last week we discussed what CRI certification really means for carpet extractors. Over the next few weeks, we will analyze the three different areas that the CRI testing program certifies machine performance in. These include soil removal, water containment and carpet appearance retention.

The combination of foot traffic and dust settlement can lead to a large amount of soil buildup in carpet, requiring the need for soil removal. CRI’s soil removal test utilizes X-ray fluorescence (XRF) technology developed by NASA that analyzes the emission spectrum when an atom is excited. In the test, a patch of carpet receives a set amount of soil. The cleaning machine is then allowed to extract the carpet. After the machine is done cleaning, the XRF gun irradiates the carpet, and the soil left behind emits fluorescent X-ray radiation based on the energy characteristics of each element. Scientists then measure the intensities of the emitted energies to determine how much soil remains in the sample. If the extractor is able to remove 55-70 percent of the soil it receives bronze certification, 70-80 percent earns silver distinction and by removing 80 or more percent of the soil the extractor is rated with a gold certification for soil removal.

Check back next week for a discussion on the CRI testing program for water containment.