Ningbo Yierka Seals Co ., Ltd is an enterprise specialized in producing and researching hydraulic seals . It has the history of manufacturing TPU hydraulic seals more than 20 years . Since 1991 , the company took technical corporation with Sciences Academy of China , Hefei Branch and has succeeded in turning our series of hydraulic seals to be used in mine , hydraulic system , plastic jetting machinery , engineering machinery and so on . The company has abundant technology , senior research fellows advanced physical and chemical labs . It can produce according to the polyurethane , polytetrafluoro and rubber samples provided by customers both standard and anomaly . Our every property target of products are correspond to the quota of international , can holly replace the imported ones . Our products have been exported to countries and regions all over the world , like Europe and Southeast Asia . We can design and research all kind of seals and sundries out of standard according to customers" requirement . The company specialized in producing seals of double-function , drill-using , spool-using , buffer ring , dustproof , wear-resistant ring . with a complete range of specifications , advanced equipment , perfect testing means , it has passed ISO9001:2000 quality system attestation . To be Credible is our purpose and "excellent quality and fine service" is why you choose us .