Qingdao hengli material co., ltd is a leading manufacturer and exporter of all series of carbon black in china. the main carbon black product include n115 .n200 .n234 n330.n339.n375.n550.n660.n774 etc. during the past years .we have always been offering preeminent services to our customers all around the world .our products are popular in international market for high quality with low price .so we also have won the great reputation of the consumers . our company passed iso9001 system authentication in 1998. if you have purchase plan of carbon black .it is will be appreciated that you send me the specific buying leading, we will meet your interest with the best. we hope that we can enter into the mutual beneficial relations between us in near future. pls feel free to contact me !