Precleaned Vials

Reporter US Vol 28

US EPA Methods 8260, 624, and 524 all cite the use of “clean vials” for sample collection to reduce the possibility of contamination from trace volatile organics found on the glass surface. The methods also provide instructions for the proper cleaning of the vials. These instructions state that the components of the vial system should be washed with soap and water, rinsed with distilled deionized water, and then dried in an oven at 100 °C for approximately one hour.

To reduce the possibility of sample contamination and to save time, Supelco offers a line of precleaned sampling vials that conform to the EPA’s definition of clean vials. These vials are manufactured from Type l borosilicate glass and are cleaned for water sampling according to US EPA Title 40: Protection of Environment, Part 136 Guidelines establishing test procedures for the analysis of pollutants.

All vials are shrink wrapped immediately after cleaning to ensure their cleanliness. They are offered in clear and amber glass, and in sizes ranging from 2 to 40 mL. All are assembled with a tan PTFE/white silicone septa and an open-top, black, polypropylene cap. The 2 to 22 mL vials are shipped with a Certificate of Conformity, and the 40 mL EPA/VOA vial with a Certificate of Analysis. Labels are conveniently provided with all package sizes.

Silanization Service for Vials

High concentrations of silanol groups (Si-O-H) on untreated glass vial surfaces can catalyze decomposition of unstable compounds or adsorb polar compounds through hydrogen bonding. Quantitative analyses of these sensitive compounds become unreliable, recoveries are reduced and analyses can be complicated by decomposition byproducts.

Supelco uses an environmental friendly process to silanize glass vials. This organosilanization process derivatizes surface silanols at a high temperature, shielding the active groups from contact with the active hydrogens on the sample components.

Our experience includes silanizing vials ranging from 2 mL to 40 mL, and maintaining a stock of popular 2 mL and 4 mL silanized vials. If your application requires a different vial, you may choose from the large assortment of Supelco brand vials, or send us your own vials for treatment.

To obtain a quote or learn more about our silanization process, please contact our Technical Service department at

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