Raws li kev tswj hwm nruj, peb cov khoom siv sulfur muaj kev ua tau zoo, txhim khu kev qha zoo thiab tsis tshua muaj siab purity, los ntawm 5N txog 7N (99.999% txog 99.99999%), kom tau raws li cov kev xav tau ntawm cov teb sib txawv uas xav tau cov khoom zoo sulfur. Cia peb ua tib zoo saib ntawm ntau qhov zoo thiab cov ntawv thov uas peb cov khoom siv sulfur yog qhov tseem ceeb hauv ntau qhov kev lag luam.