COP and COC basically belong to the same material at the raw material sales end, and they are very similar. Specifically 

look at the brand identification and parameters.

COP (Cyclic Olefin Polymer) and COC (Cyclic Olefin Copolymer) materials are two different thermoplastic polymers 

commonly used in bioscience, medical devices, and optical applications. The main difference between them is their molecular

structure and performance characteristics.

A COP material, a cycloolefin polymer, is usually a polymer formed by polymerization of a unique olefin monomer, 

such as a cycloolefin. COP polymers have high purity, high transparency, and good chemical and heat resistance. They 

also have very low water absorption and excellent UV resistance.

A COC material, a cycloolefin copolymer, is a plastic formed from the copolymerization of two or more different olefin 

monomers, usually containing cycloolefins and other alkanes. Cocs are similar to COP in that they also have high transparency 

and very low water absorption, but they may differ in certain properties such as light transmission, chemical resistance, 

and heat resistance, depending on the proportion and variety of copolymer components.

To understand the specific differences between these materials, it is necessary to compare their physical and chemical 

properties, such as glass transition temperature (Tg), refractive index, gas barrier properties, impact resistance, and 

process adaptability. These parameters are very important when selecting materials for specific applications.

In summary, both COP and COC belong to a family of high-performance materials that are widely used in advanced technologies 

that require materials with high transparency, chemical inertization, and heat resistance, but their different copolymerization 

components lead to subtle differences in performance and scope of application.