99..it was Jonny Z who asked the question. That is who the answer was for as apparently Purolator isn't forthcoming with info on what "Micronic" is.
It is a blended media of cellulose and synthetics. Unless someone from Purolator wants to provide other information.
Why it is hard for them to admit it in their literature is an interesting point with forums such as this debating the issues of cellulose, blended media, synthetic and other exotics.
I would hazard a guess it is because of the "mystery" as to what Micronic is to some 20 year old changing oil for the first time who is standing in a parts store, Micronic must be exotic and a "special" deal. Much as "Duraguard" or "Microglass" might be or other marketing whiz bang terms for media.
So why not explain in your brochure or website? If one looks at the picture of the Pure One on the website the media looks like any ordinary paper ( cellulose) media. So why not explain what "Micronic" is.
Of course their standard oil filter PER-1 had Micronic media in 1977, so what makes this "micronic" media different? That was their "cheap" filter and not their premium one they market today. Could it be..horror of horrors..that all their oil filters are "Micronic" but some of their product have different degrees of micronic than others but they don't want to have to explain that to joe consumer.... just an educated guess btw...