Testing eBay Molecular Sieves

In this video we test molecular sieves bought from eBay for their authenticity and quality and compare them to authentic lab grade molecular sieves.

Molecular sieves are used for drying solvents by selectively removing water. So to test it we simply add water to activated molecular sieves. There should be a temperature spike as they absorb water. The speed and intensity of this temperature spike roughly correleates to their quality. Low grade molecular sieves spike very slowly and not very high while fake sieves don't spike at all.

Molecular sieves type 3A are selective toward water and not methanol. So to test for selectivity we simply add methanol. If these sieves are high quality type 3A then they shouldn't absorb methanol and should give no temperature rise. Low grade molecular sieves will temperature spike indicating poor selectivity.
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Видео Testing eBay Molecular Sieves канала NurdRage