DIP with its low content of sulfur, phosphorus and low anti-harmful elements, adopts medium frequency new technology and has been first choice for water, gas and oil transfer. ISO2531, ISO4179 and ISO8179 standards are conformed. The main grades include 17 specfications of T type joint from DN60mm to DN2200mm, and 14 specfications of S and H and N1 type joint from DN100 mm to DN700mm.

DIP has the folowing certifications and awards: ISO9002 Authentication in April of 1997, "Golden Prize of New Products" in Liaoning province at the same year, SGS Quality Authentication; In June of 2002, Malaysia and Thailand Industrial and Trade Committee awarded "Golden Prize of Perfect Products" in International Construction Materials and Technology Achievements Exposition.