... Description Main productsThe main product is hi-performance bare spandex yarn,15D,20D,30D,40D,70D,105D,140D,210D,280D, ... can also produce silicon free spandex. UsageCovering core, air interlacing yarn, circularly knitting, warp knitting, weft knitting, stockings, covering with ... Grading Workshop. 5.The different levels of spandex bare yarn can be divided into the different gradesby workers and packed ...