What is the difference between PP(polypropylene) and CPP?

• Thread starter

  Tae Hwan Kim

• Start date

  Jan 19, 2018

• Tags

  Coaxial cable Dielectric Difference Permittivity

In summary, CPP (cast-polypropylene) is often used as a dielectric material in coaxial cables, and has a similar dielectric constant to PP (polypropylene). The production process for CPP may involve extrusion and post-extrusion sizing and cooling. It is also referred to as cellular polypropylene in some cases. Its use as a dielectric in data cables is confirmed by sources such as Cable Engineering for Local Area Networks and a VTT research paper.

Question 1: What is PP(polypropylene)?

PP, or polypropylene, is a type of thermoplastic polymer that is commonly used in packaging, textiles, and other consumer products. It is a versatile and lightweight material that is known for its strength and durability.

Question 2: What is CPP?

CPP, or cast polypropylene, is a type of polypropylene that is produced using a cast film process. This results in a film that is highly transparent, glossy, and has excellent moisture barrier properties. CPP is commonly used in food packaging and other applications where high clarity is desired.

Question 3: What is the difference between PP and CPP?

The main difference between PP and CPP lies in their manufacturing processes and resulting properties. PP is produced using an extrusion process, resulting in a film that is more opaque and has a slightly lower moisture barrier compared to CPP. CPP, on the other hand, is produced using a cast film process, resulting in a film that is highly transparent and has excellent moisture barrier properties.

Question 4: Can both PP and CPP be recycled?

Yes, both PP and CPP can be recycled. However, they may need to be separated and recycled separately because they have different properties and may require different recycling processes.

Question 5: Which is better for packaging - PP or CPP?

The answer to this question depends on the specific needs of the packaging. PP is more commonly used for general packaging applications, while CPP is often used for food packaging or applications that require high transparency and moisture barrier properties. It is important to consider the specific properties and requirements of the packaging when choosing between PP and CPP.