Terephthalic acid is an organic compound with the chemical formula C6H4(COOH)2. Terephthalic acid is a white crystalline solid and is a key building block in the production of various polymers, particularly polyethylene terephthalate (PET). Buy high quality Terephthalic acid from Molsyns Research. Molsyns Research is one of the leading manufacturer and exporter of Terephthalic acid