Cov kuab tshuaj residue ntawm cov ntim ntim feem ntau tsim nyob rau hauv cov luam ntawv number case solvent residues, hnyav thiab cov txheej txheem ntau lawm, feem ntau siv cov kuab tshuaj xws li toluene thiab butanone, ethyl acetate.
GB9683—
1988 complex compounds, nws tus kheej tsis yog decomposition, digestion thiab nqus nyob rau hauv lub cev kuj tsis yog, thiab yog li ntawd nws yog suav tias yog ib tug muaj kev ruaj ntseg, tsis muaj tshuaj lom packing khoom.
Tab sis vim yog qhov xav tau ntawm kev ua tiav, uas feem ntau koom nrog ntau yam khoom siv ntxiv, xws li kev txhawb nqa tus neeg sawv cev, tus neeg saib xyuas kev tiv thaiv, tus neeg sawv cev filling, coj teeb meem kev nyab xeeb khoom noj.
Synthetic roj hmab yog tsuas yog muab los ntawm cov roj chemical raw cov ntaub ntawv, txheeb yog ntau, yog tsim los ntawm monomer los ntawm ntau yam txheej txheem ntawm polymer tebchaw, dawb me me molecules muaj teeb meem rau tib neeg lub cev.
