Graduated PFA Vials are UN Compliant, non-contaminating, drop & leak tested and chemically inert. Perfluoroalkoxy (PFA) exhibits characteristics similar to PTFE, another fluoropolymer, including very low coefficient of friction which increases rate of sample recovery. PFA differs from PTFE in that PFA has a lower melting point and higher impact strength and chemical resistance. Thus, PFA vials are desirable for use in critical or highly corrosive processes; PFA vials also make great forensic vials. PFA vials exhibit superior heat/cold resistance and are easy to clean, lightweight, translucent, and unbreakable.