To be considered compostable according to the UNI EN 13432 standard, a material must meet the following requirements: – biodegradability: it is the metabolic conversion of the material into carbon dioxide. Biodegradability is measured with the standard test EN 14046 (also known as ISO 14855: biodegradability under controlled composting conditions). If the material is 90% biodegradable in less than 6 months it is fully biodegradable. – disintegrability: absence of visual contamination, the material fragments and loses visibility in the final compost. The test that measures disintegrability takes place on a pilot scale and is called EN 14045: the material is composted with organic waste for three months. At the end of this period the resulting compost is analyzed with a deviation of 2 mm. To pass the test, the residues of the tested material that exceed 2 mm in size must have a mass of less than 10% of the initial mass. – presence of heavy metals below the predefined maximum values – absence of negative effects on the composting process, here too the composting test takes place on a pilot scale. – absence of negative effects on the quality of the compost through the modified OECD 208 test, the plant growth test is performed on compost samples where the material under observation has finished degradation. To pass the test there must be no difference between those compost samples and a control compost. – non alteration of chemical-physical parameters following degradation: pH, N, P, Mg, K, saline content, volatile solids.