; the foregoing with consistent diameter to be suitable for silk-screening (provided for in subheading 5402.45.90) Free No change No change On or before 12/31/2020 . 1170. Untwisted filament polyvinyl alcohol yarn Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.12.87 Synthetic (polyvinyl alcohol) filament yarn, untwisted, measuring from 1100 to 1330 decitex (dtex) and consisting of 200 filaments, certified by the importer as having from 6.8 to 8.2 cN/dtex tenacity and with elongation at break from 7.7 to 13.5 percent (provided for in subheading 5402.49.91) Free No change No change On or before 12/31/2020 . 1171. Grilon yarn Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.12.88 Synthetic filament yarn (other than sewing thread) not put up for retail sale, single, with a twist exceeding 50 turns/m, of nylon or other polyamides, measuring 23 or more but not over 840 decitex, each formed from 4 to 68 filaments and containing 10 percent or more by weight of nylon 12 (provided for in subheading 5402.51.00) Free No change No change On or before 12/31/2020 . 1172. High tenacity single rayon yarn with a decitex equal to or greater than 1,000 Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.12.89 High tenacity single yarn of viscose rayon, with a decitex equal to or greater than 1,000, the foregoing not put up for retail sale and other than sewing thread (provided for in subheading 5403.10.30) Free No change No change On or before 12/31/2020 . 1173. High tenacity single rayon yarn with a decitex less than 1,000 Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.12.90 High tenacity single yarn of viscose rayon, with a decitex less than 1,000 (provided for in subheading 5403.10.30) Free No change No change On or before 12/31/2020 . 1174. High tenacity multiple or cabled rayon yarn Subchapter II of