A recycled waste plastic (recycled high density poly ethylene RHDPE and recycled low density poly ethylene RLDPE) are exposed to environmental conditions during the usage for many years ago. Also the chemical contaminants in the internal composition had effects on the thermo-mechanical and other properties for these wastes.
Then weathering effect data are examine for both locally and international wastes on their thermo-mechanical and chemical properties such as (Tensile strength, modulus, elongation, impact and permeability) respectively.
Afterward different mathematical software models are applied to analysis these weathering – properties data in order to estimate the more effective properties that changed by these weathering conditions such as (concentration of contaminant, time, temperature, thickness of specimen, length of spectra, basic property).
The results shows that a multi-polynomial model has a best fit for most or several of properties to active weathering variables, also gave a vary residual and deviation than experimental analyzed data for both sources of wastes local and international RHDPE and RLDPE. Also results of thermo-mechanical and chemical properties prove that both tensile strength and modulus of elasticity thermo-mechanical properties and permeability / length of spectra chemical property were given a high quality of correction and fitting factor from 93-99 %, with less deviation and residual function was produced. And analyzed weathering properties of RHDPE gave a best fit than RLDPE; all of them fitted the mathematical software model below:


a, b, c …J = coefficient of the best fit model.
x1 = concentration of contaminants.
x2 = time of aging.