DTI has evaluated the effectiveness of the oil based evaporation cover to lower than 5000 times compared to uncovered. At this evaporation rate it would take thousands of year for a simple glass of water to evaporate. But the twist is that it actually would gain in weight instead, from the amount of dust and other particles that would become suspended in the liquid over time.
This development is an important step towards enabling reliable nanoflow measurement, where otherwise the fluid would evaporate faster than it is pumped. In case you want to know more about this, please contact Claus Melvad at DTI.