Cov khoom siv phom sij tsis txawv raws li chav kawm A lossis B tab sis los ntawm lawv qhov kev phom sij, zoo li cov khoom corrosive, cov pa phem, thiab combustible kua.
Cov kev faib tawm ntawm chav kawm A thiab B tau piav qhia hauv GB50160-2008 “Petrochemical Enterprises Fire Safety Design Standards.”
Pentane, nrog lub teeb nyem ntawm -40 ℃ thiab tawg qis qis ntawm 1.7%, yog categorized raws li Class A hluav taws muaj kev phom sij tshuaj lom neeg.