Based out of China, Tianhua Tech Co., Ltd specializes in the research, development, manufacturing and marketing of its chief product OxyFree 504. The 504 diabsorber, a series of oxygen and carbon dioxide absorbers, offers both iron based and non-iron based options. Fifteen years ago, Tianhua Tech pioneered its oxygen scavenging packaging solution in China and introduced the first and second generation of oxygen absorbers, also known as oxygen scavengers, into the domestic market. In addition, Tianhua Tech invented the patented general-purpose "504 diabsorber", the first of its kind in the world.