... Main productsThe main product is hi-performance bare spandex yarn,15D,20D,30D,40D,70D,105D,140D,210D,280D, ... solid content and viscosity. 3.Polymerization Workshop are responsible for the monitoring and control of production process ,and they also adjust the content of ... 5.The different levels of spandex bare yarn can be divided into the different gradesby workers and packed in the grading workshop ...