Indian producers of purified terephthalic acid (PTA), a key raw material for manufacturing polyester chips, have cause for cheer with the Finance Ministry imposing definitive anti-dumping duty (ADD) on its imports from China, Iran, Taiwan, Indonesia and Malaysia. This Revenue Department move-which came less than a month after the recommendation of the designated authority in the Commerce Ministry-is expected to come as a relief for Reliance Industries and Indian Oil Corporation Ltd (IOCL).