Tianhua Tech Co. Ltd (China) has more than 17 years of experience in the manufacturing and application of OxyFree™ 504 oxygen absorber (aka oxygen scavenger). We are the leading supplier of oxygen scavenger solution in the modified atmosphere packaging (MAP) industry in China. We supply a full line of oxygen absorber with iron based (ferrous based) formula (504A, 504B, 504H, GL-504H, etc.) and non-iron based formula (504E, 504F) that will be suitable for a wide range of application.