Any discussion of ultra high purity (UHP) grade hydrocarbons must start with a qualifier: since there are multiple industries using these products — for multiple applications — definitions of the “highest grade” are fluid.
For example, the industrial gas industry, and its line of atmospheric products, differs greatly from the oil and gas industry’s line of products and hydrocarbons, as relates to measurements, nomenclature, and certificates of purity.
Even within the industrial gas space, with its focus on atmospheric products, there are some differences in nomenclature, but most agree on the same general reporting and contaminant identification for the different grades of gases and what constitutes UHP is generally agreed upon. To set the stage, it’s helpful to look at the oil and gas industry and its reporting of purities and contaminants. This industry very rarely deals with grades such as Zero or UHP, instead operating with crude, refinery, chemical, polymer, refrigerant, aerosol, wet, dry, lean, and rich grades, among others. Purity in the oil and gas industry typically means 90 percent plus assay.
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