1, qhov kev daws teeb meem yog yooj yim heev, muab faib ua peb yam:
a. Kev soj ntsuam pom tias cov hmoov txhuv nplej siab ua hmoov tawv yog khoom matt uas yog xim daj lossis xim dawb. Cov khoom siv ua hmoov txhuv npleg tsis muaj xim dub lossis xiav xim.
b. Cov cim ntxhiab txhais tau hais tias cov khoom sib xws sib xws rub tawm ib leeg los ua kom sov. Cov khoom siv hmoov txhuv nplej siab muaj lub teeb pob kws tshuaj ntsuab los yog nroj tsuag ntxhiab. Lwm cov khoom muaj ib cov ntxhiab tsw.
c. Txoj kev ntxub ntxaug txhais tau hais tias qhov thib ob hom khoom yog hlawv liab nplaim taws ua xua nchuav xiav rau lwm hom, thiab cov ntoo tshauv hlawv yog muab xau los ntawm txhais tes, thiab cov hmoov dub yog cov hmoov txhuv nplej siab thiab hmoov yog sib zog rau lwm cov khoom.
2, cov khoom tseem ceeb yog cov cab kuj, cov hmoov nplej siab nplej siab, cov neeg sib tw ua ke, cov tshuaj ciam qis thiab lwm yam qis tsis muaj molecular.
3, floating khoom tej zaum yuav tshwm sim los ntawm ob hom mob
a. Cov roj nplua nyeem ntxiv nyob rau hauv ib qho nyiaj ntau thiab tsis yog tag nrho cov devolatilized thaum lub sij hawm ua rau qhov seem yuav tsum tau thov mus rau saum npoo ntawm cov khoom.
b. Inorganic tshuaj xws li talc. Tus nqi ntawm hnyav calcium ntxiv yog loj heev rau daim ntawv.