My Innovation involves an Eco-friendly and cost-effective solution to the problem of waste plastics. Plastic waste management is the most discussed topic of the present world as the accumulation of plastic waste in the environment causes serious environmental pollution. I have developed a novel, eco-friendly and cost-effective material from LDPE waste plastics(Plastic Bags, below 40 microns, which is not recyclable) and Blast Furnace Slag, which is also waste material from Iron and steel industry. The composite is made by mixing the granulated LDPE waste plastic with blast furnace slag in the proportion of 60:40 and extruded. The obtained granules are used in the different moulding techniques based on its applications. The material is 24 times stronger than concrete ( with 1400 MPa of Compression Strength) 12 times Cheaper than Concrete ( costing 12 Rupees for Cubic foot) and 8 times lighter than Concrete. It\'s 99.9 % Corrosion Resistant, Hence it is the best material to construct Barriers along sea shore thus preventing Coastal erosion. This material also has numerous application in various sectors starting from furniture to the construction of the entire building. Thus Solving the three main problem s of Plastic waste disposal, Slag disposal and Coastal erosion and empowering the development of the nation.