Scott Brand Certified Class mixtures offer the largest selection and combination of components, concentrations, balance gases and cylinder sizes. Components can be blended into a variety of balance gases, such as the traditional nitrogen, air or helium. Air Liquide's Certified Class mixtures even offer you the option of blending components into hydrocarbon gas and liquid phases such as methane, ethylene or liquefied petroleum gas (LPG).
Our Certified Class offers reactive and nonreactive components in almost any concentration range. They are available with one, a few or many components, and are limited only by the physical properties and chemical reactivity characteristics of the components themselves. Air Liquide has successfully produced mixtures with more than 100 components.
- Reactive component analysis
- Chemical or remote ambient screening
- Complex matrix analysis
- Gasoline/RFG/fuels analysis
- Health/safety/worker exposure measurements
- Exploratory and one-of-a-kind mixtures
Certified Master Class™ Mixtures
Certified Master Class mixtures are blended using high-accuracy gravimetric, volumetric or our patented ACUBLEND™ and FLEXBLEND™ techniques, depending on the components, concentrations and combinations you select. This class of mixtures is single-certified, that is, the stated (certified) concentration is determined from either the blend process or from instrumental analysis. For Certified Master Class mixtures, the accuracy of the certified concentration is typically ±1% or ±2% depending on the concentration range you select. While some suppliers offer gas mixtures they refer to as being "certified," Air Liquide's Certified Master Class mixtures feature both guaranteed concentration and accuracy for each component in your mix. As a result, you can be certain that your Certified Class mixture meets Air Liquide specifications.
Certified Master Class products provide you flexibility in component selection. Raw materials are carefully selected and analyzed to control impurities prior to use, even in cases where rare, unusual or customer provided materials are used. Further, and prior to manufacture, Air Liquide conducts extensive engineering for every Certified Class mixture to assure that each mixture can be prepared safely and that no uncontrolled cross-contamination or cross-interference will occur.
Air Liquide provides a detailed Certificate of Accuracy with every Certified Master Class mixture. The certified concentration is reported for each minor component. In addition, the requested concentration can be shown indicating the blend tolerance specification ordered, a useful feature for reordering. Every Certified Master Class Certificate of Accuracy also documents the process traceability and shelf life.
Certified Working Class™ Mixtures
Scott Brand Certified Class mixtures are used in a wide variety of laboratory and online instrumentation applications such as primary calibration and validation under statistical process control (SPC). Your specific requirement will drive the choice of class. Air Liquide selects the appropriate high-accuracy gravimetric, volumetric or dynamic process to blend your Certified Working Class mixture, depending on the components and concentrations you select. Working Class mixtures are single-certified, and the accuracy of the certified concentration ranges between ±2% to ±5%, depending on the concentration range you select.
Certified Working Class products also provide you with tremendous flexibility in component selection and combination. Air Liquide practices the same careful raw material quality control and preblend engineering as used in Certified Master products to assure a reliable and safe mix. An added benefit, depending on your specific needs, is that a Certified Working Class product may actually be available at a lower concentration or for a more reactive component than for the corresponding Certified Master Class, because of the wider tolerances allowed by the Certified Working Class specifications.
Air Liquide provides a detailed Certificate of Accuracy with every Certified Working Class mixture. The certified concentration is reported for each minor component. In addition, the requested concentration can be shown indicating the blend tolerance specification, a useful feature for reordering. Every Certified Working Class Certificate of Accuracy also documents the process traceability and shelf life.