Product Information
Chemical Abstracts Service numbers are included for most products. This number may be the one listed for the compound in the TSCA Substance Inventory for some hydrated materials. Some additional product information is available in the GFS Chemi- cals Publications listed inside the back cover of our print catalog.
Definitions of Purity Grades
Certified: Primary standard material for use in very ex- act analysis. Assay between 99.97% and 100.03% with our determined value on the label.
Primary Standard: For use as a standard in analysis. Assay value 99.9% to 100.1%, or as noted.
High Purity Materials: When the assay appears as a specification, it is based on a determination of the product. When the assay appears as part of the product name, it refers to a metals purity basis and does not indicate standard reference purity.
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Reagent (ACS): Material meets specifications as given in ACS Reagent Chemicals or supplements thereto. Reagent: High purity material meeting the indicated speci- fications. Normally, specifica- tions are comparable to those for similar ACS materials.
Technical: Material satisfac- tory for uses where a reagent grade is not necessary.
Commercial: Materials being prepared in volume for gen- eral industrial use. Normally not of reagent quality.
