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    For reference, the Corneometer M-RP% readings were: 100 for glycerin, 99 for IPIS, 50 for petrolatum and 15 for ISIS. In-vitro, IPIS was found 3 times less efficient in stopping the evaporation of water through a cellulosic membrane (and ISIS less than half as efficient as petrolatum). It's worth noting here that when a similar test was done ref. [58] using In-Vitro Skin ™ the effect of membrane choice was clearly evidenced: the occlusivity order was the same, with petrolatum being much more occlusive, but the difference between IPIS and ISIS was considerably smaller.
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    Detailed information and literature references on the AquaFlux equipment can be found on, accessed Xx June 2012.
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    See paper by Pennick elsewhere in this issue.