This blog covers commonly used injection molding materials including polypropylene, acrylonitrile butadiene styrene, polycarbonate, polyethylene, and nylon, as well as lesser-known materials such as liquid silicone rubber, polyphenylene oxide, and polyetherimide. It emphasizes the importance of considering factors such as strength, price, and physical properties when selecting a material for an injection molding project to achieve the desired performance, cost, and quality.