The easiest way to evaluate DEF is to look for API certification on labeling as well as ISO 22241 standards on labeling. Visit www.iso.org for more information. There are dozens of different companies that sell DEF.
For a more scientific evaluation, you could send a sample of the fluid you buy to DEF testing laboratories, where professionals will evaluate it for you. These tests are the most accurate, but it can be expensive to have a professional lab test samples for you, and you'll have to wait until the lab mails you back your samples.
If you want the accuracy of scientific tests without the expense and inconvenience of hiring a lab to run them, consider performing your own tests. A variety of easy-to-use devices exist that allow you to test the quality and concentration of your DEF. With an optical refractometer, for example, you can measure the percentages of water and urea in your DEF by noting the degree to which the fluid distorts light. Digital refractometers are also available to calculate these percentages for you. Hydrometers allow you to measure the density of your DEF; the denser it is, the higher the percentage of urea. To test for contamination, you can put test strips in your DEF and see if they change color.
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