Depending on the form of titanium dioxide TiO2 and the wavelength of light. titanium dioxide TiO2 has a refractive index ranging from 2.6 to 2.9. Its high refractive index makes it suitable for optical and photonics applications. such as anti-reflective coatings and optical waveguides.

The price of polypropylene per ton can vary widely depending on factors like global oil prices, production costs, and market demand. As of the last update in 2023, prices were hovering around $900 to $1200 per ton, but these figures can fluctuate. It's important to note that regional differences can also significantly impact prices, with costs in areas with higher production capacity generally being lower. For accurate pricing, it's advisable to check the latest market reports or contact suppliers directly, as they can offer real-time quotes and might provide volume discounts or have additional fees that affect the final cost.

While not completely waterproof. polypropylene felt is highly water resistant due to its plastic polymer composition. However. when exposed to pressure or immersion. the interwoven fibers of felt can allow water to seep through.

It's worth noting the difference between water repellency and waterproofing - the former refers to quick drainage and drying capabilities. while the latter provides an impermeable barrier in any circumstance. In cases where full waterproofing is necessary. polypropylene felt may require an added coating or be used with other waterproof materials.