There are few references to determine the plasticity behavior of non-petroleum mulches before application. Plasticity behavior covers many areas of science and engineering and is used in various materials. The premise of this study is mainly to introduce a new method to measure The Intrinsic Potential Plasticity (IPPI) Index defined here for several types of non-petroleum mulch before spraying on dunes. Many researchers are trying to find a suitable dune stabilizer as an alternative to bitumen for fixing dune systems. Petroleum mulch was a widespread material for dune stabilization in Iran, but in fact, it is harmful to the environment and many soil biotas. One of the advantages of bituminous mulch is its plasticity behavior. Observations show that several non-petroleum mulches have no effective performance in terms of plasticity and consistency. On the other hand, sand particles are classified as none plastic, hence it is difficult to determine the plasticity behavior of stabilizers in the Lab. To prove the technique, several liquid mulches were tested. A heavy texture soil is selected as a facilitator medium and its plasticity index was measured using distilled water. Then, each mulch was added to this medium using the same procedure and assuming no interaction between mulch and clay minerals. Then, subtracting the plasticity index of the medium soil from the total plasticity index of the medium soil plus mulch, resulted in the calculation of (IPPI) for several liquid stabilizers explained in the article