一、Hot Line： 　　 　0538-3393679 is available from 8:00a.m to 18:00p.m. You can call this line for consultation, and feedback us your suggestion or advice. 二、E-mail： 　"sales@sdgtsy.com” and "Guest Board” are the platforms of communication, through them you can contact us freely, and we will help you solve any doubt in time. 三、Technological Consultation：　　 　Research Institute of Qilu SINOPEC：Zhang Xinhua（0533-7586348） 四、After-sales Service：　　 　We have established complete customer files, and tracked product's condition of using to understand custmoer's demand. By the high-grade quality, complete after-sales service, and favorable credit, we will help our custmoers out of their difficulties, and create the brilliant future together.