Zogulitsa za Defu zimatengera satifiketi yovomerezeka yapadziko lonse lapansi, satifiketi yoyang'anira zachilengedwe, kasamalidwe kaumoyo wapantchito, kuti makasitomala akhale ndi chitsimikiziro chokulirapo komanso chitetezo pakugwiritsa ntchito zinthu.
Mu 2010, adadutsa chiphaso chamtundu wa German Rhine TUV TS16949:2009
Mu 2014, adadutsa Guangdong zhongjian GB/t28001-2011 / ohsas18001-2007 kasamalidwe kaumoyo ndi chitetezo pantchito.
Mu 2014, kampaniyo idadutsa Guangdong zhongjian GB/t24001-2004 / iso14001-2004 chiphaso chachitetezo chachitetezo cha chilengedwe.