Intermediates, ib qho tseem ceeb ntawm kev lag luam tshuaj, yog cov khoom sib txuas tsim tawm thaum muaj tshuaj lom neeg thiab siv rau hauv kev sib txuas ntxiv ntawm lwm cov tebchaw. Lawv feem ntau tsis yog cov khoom kawg, tab sis ua lub luag haujlwm tseem ceeb hauv kev tsim khoom. Qhov tseem ceeb ntawm cov neeg nruab nrab nyob hauv lawv lub peev xwm los txuas cov khoom pib thiab cov khoom kawg, ua tiav cov kev hloov pauv hauv cov qauv molecular thiab kev txhim kho hauv kev ua haujlwm los ntawm kev hloov pauv tshuaj lom neeg.
Intermediates muaj ntau haiv neeg, npog ntau yam xws li organic, inorganic, thiab polymeric. Lawv muaj kev siv dav hauv ntau lub lag luam xws li tshuaj, tshuaj tua kab, dyes, coatings, fragrances, thiab zaub mov additives. Piv txwv li, cov synthesis ntawm ntau cov tshuaj yuav tsum muaj ntau yam tshuaj tiv thaiv cov kauj ruam, txhua yam uas yuav koom nrog kev siv ib los yog ntau tshaj intermediates.