Cuvette Faqs

  1. Are your cells matched?
  2. How Do Matching Numbers Work?
  3. Do you manufacture cells for Circular Dichroism (CD)?
  4. Will your cuvettes work in my instrument?
  5. What is Z-Dimension (Zd)?
  6. What does "ES" stand for?
  7. What is the difference between UV and ES Quartz?
  8. How do I clean my cuvette?
  9. Can I use these cuvettes for cryogenics?
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    Are your cells matched?

    All of our UV Quartz, ES Quartz, and IR Quartz cells come automatically matched.  Whether you order 2 cells or 30 cells, all cells will be matched.

    You can check for the matching number in the upper right hand corner of the cuvette.  Please note not all cells have matching numbers on them.
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    How Do Matching Numbers Work?

    NSG Precision Cells engraves a number on each cuvette we manufacture.  We call these numbers "Matching Numbers."  These numbers are located in the upper right hand corner of the cuvette and range from #s 1-9 depending on the type of material.


    The purpose of these matching numbers is to ensure that each cuvette has the same transmission properties.


    Example: A researcher has a cuvette with a matching number “1” and he loves the results he gets with this cell and wants to order the same cell that will give him exactly the same result.  The researcher will call NSG and say I have Type XYZ and it has a matching number “1” on it.  NSG will then provide him with a cuvette with a matching number "1" ensuring that he will get the same transmission results as the cuvette he is currently using.

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    Do you manufacture cells for Circular Dichroism (CD)?

    Yes we do.  We have rectangular and circular cuvettes that can be used for CD experiments.  Please contact us for more details.
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    Will your cuvettes work in my instrument?

    Most of our cuvettes are designed to fit into a standard cell holder which is 12.5 x 12.5 mm.  It is best to measure the cuvette holder in your machine and see what the dimensions are.

    We have many different cuvettes available so if your holder is not 12.5 x 12.5 mm, please contact us and we will be happy to assist you in choosing the correct cuvette for your instrument.
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    What is Z-Dimension (Zd)?

    The Z-dimension (center height) is the height from the bottom of the cuvette to the center of its sample chamber.  In cases where the cuvette's polished window is very small (where usually the entire cuvette is black aside from the aperture window), it is critical that the Z-dimenion of the cuvette be the same as the height of the instrument's light beam.

    Generally speaking, Z-dimension can be either 8.5, 15, or 20 mm depending on the instruments manufacturer.

    Only certain cuvettes depend on the correct Z-dimension.  These cuvettes have Z-dimension (Zd) information provided in their data tables.
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    What does "ES" stand for?

    1. ES stands for Extrasil.  This is our special brand of quartz that our factory produces.
    2. ES quartz is a synthetic quartz with little to no impurities
    3. ES quartz is also a Suprasil-1 equivalent
    Read more about ES Quartz on our Extrasil ES Quartz page.
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    What is the difference between UV and ES Quartz?

    ES Quartz is a slightly better grade of quartz than UV Quartz and offers superior transmission in the lower nm range, below are the ranges for UV and ES Quartz.

    • UV Quartz: 220-2,500 nm
    • ES Quartz: 180-2,500 nm
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    How do I clean my cuvette?

    Cuvettes must be scrupulously clean.  Optical surfaces should not be touched as oil smudges are difficult to remove.  Purity of solvents used as a sample and cleaning is important.  Only distilled water or spectrophotometric grade solvents should be used to avoid contamination from impure solvents.  Cuvettes should be cleaned as soon as possible after use, a quick rinse and soak in distilled water is good for a pre-cleaning.

    For cleaning, use a mild detergent solution that does not contain lanolin, oils, or insoluble matter.  To remove stubborn contaminants, cuvettes can be soaked for a few minutes in mild sulfuric acid.  Never allow cuvettes to soak in hot concentrated acids, alkalis, or other agents which may etch and polished optical surfaces.  After cleaning with detergent and/or acid, cuvettes should be thoroughly rinsed with distilled water.  Avoid blowing the cuvette with air to dry them.  It is better to speed evaporation by means of suction.

    Please see our Cuvette Washers for an easy cleaning solution.
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    Can I use these cuvettes for cryogenics?

    Precision Cells carries a few cuvettes that are designed specifically for cryogenics work.  These are the Type 64, Type 65, Type 66, and Type 65FL.

    Important:  If you use a cuvette for cryogenics that is not one of the cells above, you will void your warranty for a replacement.  The cells above (Type 64, Type 65, Type 66, and Type 65FL) are made in a very special way making them able to withstand temperatures down to 77 Kelvin.  All other cells are made with our standard fusing methods and will break if used for cryogenics.