Research Report RR:F11-1020
An intralaboratory study was conducted to establish precision statements for F2828. One laboratory reported a total of five replicate results (each of the average of multiple measurements taken with and against the natural lay of the carpet fibers) over a period of five testing days.
F2828-20 Standard Test Method for Assessing Carpet Cleaning Effectiveness in Terms of Visual Appearance Change When Cleaned with a Wet Extraction Cleaning System
Committee F11 on Vacuum Cleaners
Subcommittee F11.35 on Extractor Cleaners