Zvese zvakavharirwa zvinhu zvakagadzika hydrolytically uye zvinowirirana nezvose zvakajairwa tsime kupedza zvinwiwa, kusanganisira high-pressure gasi.Kusarudzwa kwezvinhu kunoenderana nemaitiro akasiyana siyana, anosanganisira kupisa kwepasi, kuoma, kusimba uye kubvarura simba, kunyura kwemvura uye gasi permeability, oxidation, uye abrasion uye makemikari kuramba.