Polypropylene, a versatile and durable plastic, is widely used in various applications due to its resistance to chemicals, heat, and impact. Commonly found in packaging, it is used for containers, bottles, and wrappers due to its ability to keep moisture at bay. In the textile industry, it's favored for making carpets, rugs, and athletic wear because of its resilience and moisture-wicking properties. Automotive industries use it for car parts, including bumpers and battery cases, benefitting from its lightweight nature and durability. Moreover, it's employed in the healthcare sector for medical devices and disposable syringes, thanks to its sterilizability and safety. The material's recyclability also makes it a preferred choice in eco-conscious applications, promoting sustainability in manufacturing practices.

Thermochromic pigment powder, which changes color in response to temperature changes, can be purchased from a variety of sources. Online marketplaces like Amazon and eBay have a wide selection of these pigments available from numerous sellers. Specialty craft stores and suppliers like SolarColorDust.com and PaintWithPearl.com also offer these types of pigments, catering to both hobbyists and professionals. For bulk purchases or more specific thermochromic materials, companies like Matsui International and Chromatic Technologies Inc. provide advanced options tailored to large-scale or industrial applications. Always consider the temperature range and color shift you need for your project when selecting a pigment.

Acetone is a powerful solvent that is effective at dissolving or affecting many plastics, but it does not significantly dissolve polypropylene. Polypropylene is known for its resistance to a wide range of chemicals, including many solvents like acetone. This resistance is due to polypropylene's non-polar, high molecular weight structure which doesn't interact strongly with acetone, a relatively polar solvent. However, while acetone may not dissolve polypropylene, it can cause swelling or surface damage under certain conditions, depending on the polypropylene's formulation and the exposure duration. For applications requiring cleaning or surface preparation of polypropylene, it's critical to choose chemicals that don't compromise its structural integrity.