2,4-di-tert-butylphenol is for Ultraviolet Light Absorbers and antioxidant 168, while 2,6-di-tert-butyl phenol is for antioxidant 1010,1076, antioxidant T-502 is mainly used in place of BHT (T501) for oils as additive. More information, you can visit our website http://www.jiyichem.com