Polypropylene (PP) is a lightweight, durable thermoplastic polymer known for its versatility in various applications, from packaging to automotive parts. Its properties include high chemical resistance, making it suitable for containers that store liquids like detergents and acids. PP also has a high melting point (around 160°C), allowing it to be used in microwaveable containers and hot fill applications. It's resilient to fatigue, meaning it's ideal for products requiring hinge mechanisms. Additionally, PP has good electrical insulating properties. However, it does have some limitations, such as poor UV resistance, which can be improved through additives. Its low density provides benefits in applications where weight savings are important. PP can be easily modified with additives to enhance properties like impact resistance, making it a highly adaptable material for a wide range of industries.

Using PVC pipe for dryer exhaust vents is not recommended or safe according to most building codes and manufacturers' instructions. The primary concern with PVC is that it can easily melt or catch fire due to the high temperatures produced by dryers. Standard dryer exhaust temperatures can reach up to 125 degrees Fahrenheit, and in the event of a lint fire, temperatures can far exceed this, posing a serious risk of melting PVC pipes and potentially causing a fire hazard. Most codes and guidelines recommend using metal ducts, either aluminum or galvanized steel, which are more resistant to heat and fires. Additionally, using PVC can lead to issues with moisture due to condensation within the pipe, potentially leading to mold growth. For these reasons, it's crucial to follow local codes and manufacturer recommendations when installing a dryer exhaust system.

Connecting a sink drain to PVC piping involves several steps. Firstly, ensure you have the correct size of PVC pipe and fittings. The standard size for a kitchen sink drain is 1 ½ inches in diameter, while bathroom sinks typically use 1 ¼ inch. Next, apply plumbers' putty around the drain flange before inserting it into the sink's drain hole. Secure it from below using a rubber gasket, fiber gasket, and a locknut. For the PVC connections, you'll need a P-trap and additional PVC pipe sections to connect to the main drain line. Use PVC primer and cement to ensure watertight seals at each joint. Remember to check local building codes for compliance and consider adding a ventilation system if the distance to the main vent stack requires it. Ensuring all connections are tight and leak-proof is crucial for a successful installation.