How to Read Refractive Index on an MDEA Data Sheet

Your quality team finds 1.4694 on one supplier’s MDEA technical data sheet and a range on another. Before comparing them, check the notation beside the number. For N-methyldiethanolamine (MDEA, CAS 105-59-9), the temperature, wavelength and stated grade belong with the refractive index result.

Read the notation beside the value

A published MDEA data sheet lists a refractive index of 1.4694 as nᴰ²⁰. The superscript indicates a measurement temperature of 20 °C, while D refers to the sodium D-line wavelength, approximately 589 nm. Keep both conditions with the result when sharing it with your laboratory. amines.com

Compare the same grade under matching conditions

Check whether each value applies to concentrated MDEA, an aqueous solution or a formulated product. Then compare the measurement temperature and wavelength. If your laboratory tests at a different temperature, agree on the measurement or correction procedure before judging the result against the supplier’s data.

One commercial laboratory-grade MDEA specification, for example, gives a refractive index range of 1.4675–1.4695 at 20 °C and 589 nm. That range belongs to the specified product. Use the limits confirmed for the grade you are purchasing. assets.thermofisher.com

Confirm whether the number is an acceptance requirement

Ask whether the listed figure is a representative property or an agreed batch acceptance limit. If your quality team requires a refractive index range, include the range, test conditions and method in the purchase specification. Review the result alongside the required assay, water content and other batch checks.

Request MDEA with your optical testing requirements

Send China Amines Co., Limited your required grade, assay or concentration, net quantity, preferred packaging and destination port. If refractive index forms part of your incoming inspection, include its acceptance range, temperature and wavelength so we can review the requirement with the quotation.

Inquiries
info@chinaamines.com

Technical references

• Amines & Plasticizers Limited — Methyl Diethanolamine Technical Data Sheet
• Thermo Scientific Chemicals — N-Methyldiethanolamine Product Specification
• WHO International Pharmacopoeia — Determination of Refractive Index