As an active ingredient in sunscreens. titanium dioxide TiO2 scatters. absorbs and reflects UV rays. making it a natural mineral used in many products. As well as providing opacity and durability in paints and lacquers. it provides a bright white color and enables sunlight to accelerate the cleaning or disinfecting process. As a result. the exact mechanism varies according to how the compound is used.

Titanium has a freezing point of 1.668C 3.034F.

Polyethylene (PE) and polypropylene (PP) are both common plastics with diverse applications, from packaging to automotive parts. Generally, PE tends to be less expensive than PP. This price difference can be attributed to PE's simpler polymerization process and the fact that it is produced in larger quantities worldwide, which scales down its cost. However, prices can fluctuate based on market demand, oil prices (as both are petroleum-derived products), and the specific type or grade of the polymer. Polyethylene is preferred for its flexibility and durability, making it ideal for products like plastic bags and containers. Polypropylene, while slightly more costly, offers higher melting points, making it suitable for applications requiring resistance to heat, such as microwaveable containers. Ultimately, the choice between the two materials depends on the intended application's specific requirements and the budget constraints of the project.