AD (stock code: 002641) is the core subsidiary of the Group. It was founded in 1993.Standardization Technology Commission (SAC/TC48/SC3) chairman.The company laid out the nine core production bases in the country, with seventeen digital wisdom factories, and 20 wholly -owned (holding) subsidiaries under its jurisdiction.The production and sales volume ranked first in domestic plastic pipeline A -share listed enterprises for many years, and export volume has ranked first in the country in the country for many years.