Cov khoom siv raw ntawm cov khoom no yog silica gel, uas muaj kev nyab xeeb siv, tsis muaj ntxhiab tsw ntxhiab, muaj zog yoog raws, rov rub dua thiab deformation.Cov khoom no tuaj yeem tiv thaiv cov khoom los ntawm kev poob thiab muaj qhov zoo ntawm cov rwb thaiv tsev kub.Yooj yim ntxuav thiab dai tom qab siv.
