... Anti-frost 4)Resuable usage of buffer,packing,transportation,display/advertising PP Corrugated Hollow Board Plastic Corrugated Hollow ... kinds of transportation box, mailbox, display rack, partition, gift box, etc.2. Display/Advertising: The surface of PP Corrugated ... excellent. it is water/heat-proof suitable for indoor/outdoor display board/advertisement.3. Protection/buffer:The hollow structured ...