ZHENGDAN CHEM is the leading manufacturer specialized in Organic Chemicals, coveringTrimellitic anhydride (TMA), Trioctyltrimellitate(TOTM) and P-diethylbenzene (PDEB). Now we have the capacity of TMA 60KT tons/year; TOTM 20KT tons / year, PDEB 10KT tons /year. We are the biggest TMA producer & exporter in China, who can offer the most competitive price and best quality also.