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Frequently Asked Questions

What are the components of Standards Grade gases?

Nov 22, 2019, 16:13 PM
Title : What are the components of Standards Grade gases?
  • Primary Standard - Highly accurate mixtures prepared gravimetrically on high-precision electronic balances. These standards are analyzed against Praxair Primary Laboratory Standards (PPLS) and named to a gravimetrically generated concentration.
  • Certified Standard - These routine calibration mixtures are prepared by either gravimetric, volumetric or partial pressure methods. These standards are analyzed against Praxair Primary Laboratory Standards (PPLS).
  • Non-Certified - Mixtures are prepared by the same methods and the same care used for Certified Standard Grades. Analyses are not reported.
  • Custom - Mixtures prepared to the exact blend tolerance and analytical uncertainty requested

ST - Standard Grades

Mixture Grade Order Reference Mixture Component Concentration Range Blend Tolerance Analytical Uncertainty
Primary Standard p 1 ppm - 9.9 ppm
10 ppm - 25 ppm
25.1 ppm - 9999 ppm
1.0% - 49.9%
± 10%
± 10%
± 5%
± 2%
± 0.1 ppm
± 1%
± 1%
± 1% or 0.02% abs*
Certified Standard C 1 ppm - 99.9 ppm
100 ppm - 999 ppm
0.1% - 49.9%
± 20%
± 10%
± 5%
± 5%
± 2%
± 2%
Non-Certified Standard U 1 ppm - 999 ppm
0.1% - 49.9%
± 20%
± 10%
N/A
Custom Standard Z 1 ppm - 49.9% TBD TBD

Note: For all mixtures, blend tolerance and analytical uncertainty specification may vary depending on the chemical characteristics of the component and the cylinder size. For mixtures outside of these ranges, please contact your local Praxair representative.

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