Polyethylene (PE) and Polypropylene (PP) are commonly used polymers in plastic production. PE is recognized for its strength and flexibility, making it a popular choice for various products such as packaging, bottles, and containers in the market. The different densities available include high-density polyethylene (HDPE) and low-density polyethylene (LDPE), which can be selected based on specific usage needs.

In contrast, PP has a higher melting point and excellent resistance to chemical solvents, alkalis, and acids, making it suitable for applications like hot-fill liquid containers, automotive parts, and medical devices. Both materials are recyclable and highly valuable in the global plastics industry due to their versatility, durability, and cost-effectiveness. However, their extensive use has raised environmental concerns, underscoring the urgency for effective recycling systems and sustainable alternatives.

To keep PVC glue from drying out, ensure the container is tightly sealed after each use, as exposure to air is the primary culprit for drying. Store the glue in a cool, dry place, away from direct sunlight and extreme temperatures, which can degrade the solvent quality. Some users recommend wrapping the lid with plastic wrap before capping to add an extra air-tight seal. Also, avoid wiping the applicator brush on the rim of the can to prevent glue buildup, which can compromise the seal. Regularly cleaning the rim and threads of the container with a cloth dipped in acetone can help maintain a good seal. Implementing these steps will maximize the shelf life of your PVC glue.

Yes, "PP" indeed stands for Polypropylene, which is a thermoplastic polymer used in a wide range of applications. It's known for its versatility, resistance to various chemical solvents, bases, and acids, and its ability to be tailored for specific uses through copolymerization. Polypropylene is widely used for packaging, textiles (such as ropes, thermal underwear, and carpets), reusable containers, automotive components, and various types of plastic parts and materials due to its robustness against wear and tear. It is favored for its balance of workability, durability, cost-effectiveness, and environmental resistance, making it a staple in both household and industrial applications.