Polypropylene, a widely used plastic in various applications due to its versatility, exhibits an interesting mechanical property known as Young's modulus. Young's modulus quantifies the stiffness of a material, indicating how much it deforms under stress. For polypropylene, this value ranges from approximately 1300 to 1800 MPa (megapascals), though it can vary based on factors such as the molecular orientation and the presence of fillers. This range places polypropylene as a moderately stiff material, which is less stiff compared to materials like steel but significantly stiffer than many rubbers. The specific value of Young's modulus for a polypropylene product can be tailored through the manufacturing process, including adjusting the degree of crystallinity or adding reinforcing fibers, to suit its intended application. This adaptability makes polypropylene suitable for a wide range of applications, from automotive components to packaging materials.

Although commonly regarded as safe. titanium dioxide can cause adverse reactions. particularly when inhaled. Prolonged exposure to titanium dioxide nanoparticles may result in respiratory issues. lung damage. cancer. inflammation. and fibrosis. Ingestion of the compound can also harm the digestive system and potentially impact the brain. liver. and spleen. Hence. it is advisable to steer clear of products containing this substance or utilize them in adequately ventilated spaces. If you have concerns about possible side effects. seek guidance from a healthcare expert.

Human health is not endangered by wearing jewelry made from zirconium a popular diamond substitute. However. if we are referring to zirconium the metal extracted from zirconia. it can be harmful if we inhale it. ingest it in dust. or come in contact with our skin. Some industries use it. such as nuclear power. and it has the potential to be radioactive. Handling it requires industry professionals to be careful.