1. PIB sticky liquid makes the surface rather sticky and the layers are well jointed, thus forming an oxygen-detested environment inside the package. 2. Strong strength including stretch, tear resistance and puncture resistance. With no damages while stored in an oxygen-detested environment. 3. The film is very flexible and low-temperature resistance with no breaks caused by being crisp and frozen. 4. Non-transparence, low light-through rate, avoiding heat accumulation. 5. Long usage period and the grass bundle packed with silage film can be stored outside for one to two years.