Report on the 3rd Pilling Round Trial of IWTO Pilling Working Group ...

<strong>Report</strong> on the 3 rd Pilling Round Trial of IWTO
Pilling Working Group DTM
Results of 2 hours test in 2009/10 round trial is 0.5 grade more or less different from
those in 2010/11 round trial except those of sample W2 and W3. It’s believed after
analysis, that test results of sample W2 are mainly affected by Pilling Photographic
Standard (the Photographic Standard affiliated to ASTM D 3512 is used in 2009/10
round trial, while SM54 Lambswool is used in 2010/11 round trial). Differences on
test results of sample W3 between these 2 round trials are affected by both sample
preparation and Pilling Photographic Standard. Pilling grades of sample W1 and W2
after 4 hours test in 2010/11 is 1 grade lower than those in 2009/10 trial, that’s
mainly affected by Pilling Photographic Standard. It’s seen from reported data that
Chinese labs gave significantly different pilling grades to samples W1 and W2 from
those given by labs out of China. So It is decided that the Pilling Photograph
Standards developed by Pilling Working Group is adopted in this standard.