The Poisson's ratio of polypropylene, a common thermoplastic polymer known for its versatility and wide range of applications, is typically in the range of 0.42 to 0.44. This value characterizes how a material deforms in the transverse direction when stretched or compressed in a longitudinal direction. A higher Poisson's ratio indicates a material will expand more perpendicularly to the applied force. For polypropylene, this relatively high ratio suggests its tendency to exhibit noticeable lateral expansion under longitudinal stress. This property is significant in applications where dimensional stability under load is crucial, such as in packaging, automotive components, textiles, and various consumer goods. Understanding the Poisson's ratio is essential for engineers and designers when selecting materials and predicting their behavior under mechanical stress.

TiO2 is a chemical compound composed of titanium atoms Ti and oxygen atoms O2.

Although titanium is very strong and resistant to corrosion by water and other chemicals. it reacts with common elements like oxygen and nitrogen at high temperatures.