The Chemical Society of Thailand (CST) and Thammasat University welcome you all to the Pure and Applied Chemistry International Conference 2020, which will be held during February 13th-14th, 2020 at Impact Forum, Impact Muang Thong Thani, Nonthaburi, Thailand . The conference covers various disciplines of pure and applied chemical research. The past PACCON conferences have brought together thousands of participants and invited speakers across the world, giving them opportunities to present the advancement in chemistry research, to stimulate and initiate collaborative network, and to share knowledge of recent advancements especially in the world of chemistry and related scientific disciplines. So in PACCON2020, we are looking forward to the fruitful outcomes for all participants in all aspects, which can benefit us, our nations as well as our world not just the present but also in the future.