Polypropylene is a synthetic polymer, made through the polymerization of propylene gas—a byproduct of fossil fuel refining and natural gas processing. Developed in the mid-20th century, it has become one of the most versatile plastics, used in packaging, textiles, automotive components, and more, due to its resistance to heat, chemicals, and fatigue. Unlike natural polymers such as cellulose (found in plants) and silk (produced by insects), polypropylene does not occur naturally. It requires specific chemical processes to be produced, reflecting human ingenuity in material science to create materials with desired properties that are not found in nature.

The high strength. corrosion resistance. and weldability of grade 6 titanium make it a very good titanium alloy. In addition to aerospace structures. automotive parts. and medical devices. they are commonly used in applications requiring high strength-to-weight ratios. In terms of composition. the alloy contains 5% aluminum. 2.5% tin. small amounts of iron and other elements. It is highly resistant to salt water and high temperature exposure.

There are many modern automobiles that can be driven for about 7.500 to 10.000 miles. or 6 months. as long as the engine oil lasts about 30 million to 5.000 miles. Follow the manufacturer's recommendations for oil changes. Furthermore. oil deteriorates over time. so it should be changed at least once a year. even if you don't exceed the mileage limit.