| MESA Specialty
Gases offers three types of product grade available for your calibration
gas standard, Primary, Certified and Gravimetric Standards.
The Primary Standard
is the most accurate and is made by weight. Unless stated otherwise, the
specialty gas
mixture is certified to ± 1% analytical accuracy of the numbers
reported.
The Certified Standard
is made by a combination of pressure and/or weight measurements. Unless
stated otherwise, the calibration gas mixture is certified to ± 2% analytical accuracy
of the numbers reported.
In the case of all
specialty gas products, final calibration gas mixtures are analyzed by gas chromatography or other
suitable analytical methodology to confirm they are within the allowed
tolerances. All calibration gas mixtures are supplied with a "Certificate of
Analysis" that details the requested and analytical values as well
as preparative and analytical methods used by MESA Specialty Gases to
prepare the calibration gas standard. |