Cell open PC honeycomb 1, Light weight & high strength. 2, anti-water anti-mildew. 3, ... high-strength of their weight.Hot cutting PP12 honeycomb is hexagon Cellular structure used carbon powder or pill container for air filter ... 12mm,capacity is 65kg-75kg/m3)**Light weight, high compressive strength,anti-water,anti-humidity honeycomb can ... honeycomb structure make guarantee pp honeycomb for air filter