Calibration Standard 4B for EPA 200.7 is a certified reference material traceable to NIST and manufactured in accordance with stringent quality assurance guidelines. One year expiration date. COA and MSDS are included.
Contains SiO2 1000ug/mL, Sn 400 ug/mL, stabilized in 5% v/v nitric acid/trace hydrofluoric acid. 125 mL bottle.