Possible cart filler?

[Murdock Ruml]

so i just got a new dishwasher installed. i know, what does that have to do with cart filler. anyway, i noticed the dishwasher had some type of insulation wrapped around it. this stuff looks like Fluval and even pulls apart in layers like fluval however this stuff is sliky soft. no sure what it is make out of or if it is even safe to use as a filler. i have not tried it for this reason, but i did save the whole sheet from my old dishwasher. does anyone know what this stuff is make of. and does anyone know if it would be safe to use as a filler. i bet it would wick like crazy.