Polyethylene (PE) is a thermoplastic used in a wide variety of products. It gets its name from the monomer ethylene. Polyethylene is produced using ethylene. In the plastics industry it is commonly known as PE. Polyethylene plastic can be either low-density or high-density, can be molded and poured into molds in various shapes. Polyethylene (PE) is a hard, strong, durable and dimensionally stable material that absorbs very little water.

The crystal structure of the most common commercial polypropylene is somewhere between low-density polyethylene (LDPE) and high-density polyethylene (HDPE). Young’s modulus (modulus of elasticity) is also moderate. However, it is less hard than LDPE and much less brittle than HDPE. This allows polypropylene to be used instead of engineering plastics such as ABS.
• Polypropylene shows very good resistance to fatigue. It is low-cost and has good impact resistance. It has a low friction coefficient and provides very good electrical insulation. Chemical resistance is good. It is suitable for all thermoplastic processing processes. The melting temperature of polypropylene is between 130 and 171 °C.
• However, it has the following disadvantages. It has low resistance to UV rays and shows high thermal expansion. It is difficult to paint and coat. It has low resistance to external weather conditions and is prone to oxidation. It is flammable and interacts with solvents containing chlorine.

Urea, also known as carbamide, is an organic compound with the chemical formula CO(NH2)2. It is a colorless, odorless solid, highly soluble in water, and practically non-toxic. It is water soluble, neither acidic nor alkaline. The introduction and scientific invention of urea is described as a life-changing event in the history of agriculture. Urea N46% is the most common nitrogen fertilizer in the world and has been used in the same way in all agricultural areas of the world. Prior to this, agriculture had never seen such dramatic increases in output as well as wealth. Urea is neutral in pH and can adapt to almost any soil. It is a naturally occurring waste product by metabolizing protein in humans, as well as other mammals, amphibians, and some fish. Urea is widely used as both fertilizer and animal feed additive in the agricultural sector.