Ifilimu ye-BOPA enesithiyo esiphezulu se-EHA eyakhiwe u-Changsu inezinto ezivelele zokugcinwa kwephunga kanye nesithiyo komoyampilo [EHAp＜2cc/㎡·day·atm (23℃ 50%RH)], enganciphisa ubungozi bokungcoliswa kwamagciwane futhi ingagcinwa. isikhathi eside.Ukugcina ukunambitheka kwasekuqaleni nokunambitha okusha kukashizi.Ngaphezu kwalokho, i-EHA ingagcina ukushuba okuhle nokubhoboza ukumelana namazinga okushisa aqandayo, okunganciphisa ngempumelelo ingozi yokuphuka kwezikhwama okubangelwa imithelela ngesikhathi sokuthutha izinto.