Similar values are estimated using a different approach. Mueller and Nowack (2008) estimated the production of nanosilver in the order of 500 Mg year-1 in 2008, meaning that estimated production for 2005
could be in the order of 100–200 Mg year-1. Assuming that 10 % of total nanosilver was used in the textile sector (Mueller and Nowack 2008), this means that about 10–20 Mg year-1 of nanosilver was used in textile production (i.e. 13–63 % of the nanosilver used in the textile sector was used in association with polyester), which is in line with the previous estimation. Conversely, Keller et al. (2013) estimated that