The cost of polypropylene per pound can fluctuate significantly due to factors such as crude oil prices, demand in various industries (like automotive and packaging), and global economic conditions. As of my last knowledge update in 2023, prices generally ranged from $0.50 to $0.80 per pound for bulk quantities in the United States. It's important to note that prices can vary based on the grade of polypropylene and the volume of the purchase. For smaller quantities or specialized grades, prices can be higher. For the most accurate and current pricing, contacting suppliers directly or checking market reports is recommended, as these figures can quickly become outdated due to market volatility.

When comparing the strength of polypropylene versus polycarbonate, it is essential to define "strength" in a specific context, as it can refer to tensile strength, impact resistance, or hardness. Polycarbonate outshines polypropylene in terms of tensile strength and impact resistance, making it a preferred choice for applications requiring durability under stress, such as bullet-proof windows and medical devices. Additionally, polycarbonate exhibits excellent clarity and can be engineered for high temperature and electrical applications. On the other hand, polypropylene is renowned for its chemical resistance and is typically used in containers and packaging, automotive parts, and textiles. It also has a higher fatigue resistance than polycarbonate, making it suitable for hinges or components that undergo repetitive motion. In summary, while polypropylene is useful for its chemical resistance and fatigue strength, polycarbonate is stronger in terms of impact resistance and tensile strength.

A PVC sign refers to a sign made from polyvinyl chloride, a popular and versatile type of plastic. These signs are well-liked for their durability, weather resistance, and the fact that they don't rust, making them ideal for both indoor and outdoor use. PVC signs can be easily customized through various printing and cutting techniques, allowing for a wide range of designs and applications, from business signage and informational boards to event displays. Their lightweight nature makes installation easy, and they offer an excellent balance between cost-effectiveness and professional appearance. PVC signs can come in different thicknesses, catering to various needs, from temporary to more permanent signage solutions.