From Avalara LandedCost, by the LandedCost Research Team, updated June 1, 2017.
This page provides an overview of the basic import duty rates applied to goods that fall under the classification code 7019191050 in Portugal. This product category is defined to include:
"Yarn of 11?tex or a multiple thereof (? 7,5?%), obtained from continuous spun-glass filaments, containing 93?percent by weight or more of silicon dioxide, of a nominal diameter of 6??m or 9??m, other than those treated"