Understanding Chemical Grades
Dec 28 2015

Chemical Grades

If you’re looking to purchase iodine derivatives, it’s important that you understand the chemical grade and any specifications of the chemicals you select. Check out this handy guide for explanations of the different grades and specifications you may encounter when purchasing iodine derivatives.

Guide to Chemical Specifications

  • Stabilized – A stabilized substance has been combined with specialized chemicals designed to increase its shelf life by slowing the process of material degradation.
  • Nonstabilized/Unstabilized – A nonstabilized or unstabilized substance is one that is subject to a relatively fast degradation but has not been combined with chemicals designed to slow this process.
  • Technical – A chemical marked “technical” is one that has a purity level of less than 90 percent and has no established standard for quality.
  • Anhydrous – Anhydrous solutions have high purity levels and low water content. They are designed for use in reactions sensitive to moisture.
  • Monohydrate – A compound marked monohydrate contains one molecule of water for every molecule of the compound.

Guide to Chemical Grades

  • USP – A chemical marked “USP” grade meets the latest specifications published by the United States Pharmacopeia.
  • ACS – A chemical with the letters “ACS” in the description has been manufactured to meet or exceed the standards established by the American Chemical Society for use in analytical testing.
  • FCC – A chemical designated as “FCC” has met the testing specifications established by the USP Food Chemicals Codex.
  • Ajay Grade – When a chemical is marked “Ajay Grade,” it has met the standards our company established for purity and quality.
  • Reagent – A reagent grade chemical has a purity level greater than or equal to 95 percent. It is intended for general laboratory usage.
  • Crude – A crude element or chemical has a high level of purity but may not meet other published standards. For example, iodine designated as “crude” has a purity level of 99.5 percent or greater but does not meet the standards established by the ACS.

Interpreting Other Descriptors

Some chemicals come with other descriptors not related to their grade, including:

Percent solution – Percent solution tells you the solution’s concentration. For example, a 42 percent solution of Sodium Selenite contains 42 parts Sodium Selenite for every 100 parts of solution.
Ratio – Similar to percent solution, a ratio following the name of a solution tells you how much solute is dissolved in the solution. For example, potassium iodide, 90/10 contains approximately 90 percent potassium iodide.
Abbreviations/Other names – In some cases, you may see an acronym or another chemical name in parentheses after the name of a product. These descriptors are merely another way of identifying the chemical.

Keep in mind that some chemicals may bear more than one chemical grade or descriptor. In such cases, all descriptors apply simultaneously. For example, a solution listed as “unstabilized, ACS” does not contain stabilizing chemicals but meets ACS standards for use in analytical testing.

Are you looking to purchase iodine derivatives? Get in touch with us today at Ajay-SQM to see how we can help fill all of your iodine needs.

 

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