See if this answers your question.
According to the Rowley Company website, Gütermann 100% poly thread size is Tex 30.
http://www.rowleycompany.com/product...arge-Spool.asp
According to Coats and Clark, the conversion formula for getting from Tex system to weight system is (109/TEX) * 10.
http://www.coatsandclark.com/NR/rdon...threadsize.pdf
Therefore, Gütermann 100% poly thread is 36.33 wt.
