Tvad,
Without examining the ASTM specification and knowing more about the properties of vinyl, it's impossible for me to know much about its absorptive action, i.e. the rate of absorption. I can hazard a guess, however, that it's probably not constant over time. It may soak up the largest percentage of water in the first minutes of exposure.
Even if this is true, to what extent this hydration does or does not benefit the listening experience is unknown to me.
Without examining the ASTM specification and knowing more about the properties of vinyl, it's impossible for me to know much about its absorptive action, i.e. the rate of absorption. I can hazard a guess, however, that it's probably not constant over time. It may soak up the largest percentage of water in the first minutes of exposure.
Even if this is true, to what extent this hydration does or does not benefit the listening experience is unknown to me.