The weight capacity of PVC pipes depends on several factors such as the diameter of the pipe, wall thickness, the configuration of the pipe system (e.g., whether it's horizontal or vertical), and the type of PVC. For example, a 1-inch schedule 40 PVC pipe can safely support over 100 pounds when horizontally fixed and evenly distributing the load. However, this capacity decreases significantly when the pipe is used vertically as the stress is concentrated over a smaller area. It's crucial to consult manufacturers' specifications for precise weight limits based on your specific application. Additionally, environmental conditions such as temperature can affect PVC's strength. As a general practice, for applications supporting weight, using a PVC grade with higher pressure ratings or opting for schedules 80 or 120 can offer more robust support due to their thicker walls.

Polypropylene (PP) is a thermoplastic polymer known for its versatility and wide range of applications, from packaging to automotive components. It exhibits several key properties that make it valuable in various industries. Firstly, PP has excellent chemical resistance, able to withstand acids, bases, and solvents, making it ideal for containers and pipework in chemical processing. It also has a high melting point (around 160°C, or 320°F), which allows it to be used in applications that may involve heat. PP is known for its low density, contributing to its lightweight nature yet it maintains a high strength-to-weight ratio, providing durability and resistance to fatigue. It resists moisture absorption, making it suitable for use in environments where water exposure is likely. Additionally, polypropylene can be easily customized through the addition of colorants, and its recyclability makes it an appealing choice for eco-conscious applications. However, it has poor UV resistance unless specifically treated for outdoor use.

Polypropylene (PP) is valued for its chemical resistance, high melting point, strength-to-weight ratio, and recyclability, making it versatile in various applications.

Welding polypropylene is a process that involves joining two pieces of polypropylene material using heat and sometimes a filler material. There are several methods to achieve this, with hot air welding and speed tip welding being the most common. In hot air welding, a jet of hot air is used to melt the material's surfaces along with a plastic filler rod. In speed tip welding, a specially designed welding tip is used to directly apply heat to the welding rod and the surface, melting and fusing them together. Both methods require the proper equipment and safety precautions, including ventilation and protective gear. The choice between methods depends on the specific requirements of the project, including the thickness of the materials and the intended use of the welded joint. Proper surface preparation and practice are essential for achieving a strong and durable weld.