... sweat absorbing.2)PU FOAM(ORTHOLITE): mostly used in insole for medium and top grade shoes, case, sport equipment etc ... m3 to 80kg/m38)FILTER SPONGE(reticulate foam ): is suitable for furniture factory, shoe factory and filter equipment etc.9) ... ,washable, acid-resistant,alkalifast, Flexible,good tensile7)Use: filter dust, air, liquid, equipment filter etc. 40ppi Air Filter Foam 40ppi Air Filter Foam