Nanjing Tianhua Tech Co., Ltd(Tiahua Tech)is specialized in the reseach, development, manufacturing and marketing of our flag-ship products OxyFree"504 diabsorber", a series of oxygen and carbon dioxide absorber, both iron based or non-iron based. Fifteen years ago, Tianhua Tech, pioneered the oxygen scavenging packing solution in China. We invented the patented general-purpose"504 diabsorber", the first of its kind in the word. With the additional capacity of CO2 scavenging, it shows the advantage over its competitors of "O2-only absorber", on preventing fermenting effect by suppressing the growth of anaerobic microorganisms in an oxygen-free environment during its application.