Zhejiang Shangyu Oil Seal Co.,Ltd (PQK Oilseal Co.,Ltd), firstly established in 1969, is one of the largest companies combining research, development and production, which specializes in the production of various kinds of rubber seals. Now, with an annual output of 80,000,000 pieces of seals,our company has owned complete automatic production lines,fully automatic process equipment and perfect testing facilities. It is also fully qualified for technology development and production of rubber seals from product research & design, glue material formulation, mold making, vulcanization to...