From disadvantage that we talked about metal sheets. We have an idea to develop a composite material by using the matrix is a polymer instead of metal sheet.
Because the basic properties of the polymer are good thermal insulation, lightweight and have the ability to absorb sound. There is a possibility to be solve those disadvantage but the strength of the polymer is less than the steel plate. So, It has reinforced the strength of polymer with natural fibers.By selecting materials that easy to find and waste material in Thailand to Reduce the environmental problems from a lot of the waste materials.Then we select to use PET bottle is the matrix and use natural fibers is reinforcement