There isn't a universally recognized material called "p8." It's likely a specific designation used within a particular industry or context.

To understand what "p8 material" refers to, I need more information. Please tell me:

* Where did you encounter this term? (e.g., a technical document, a product description, a conversation)

* What is the context? (e.g., what is the material being used for?)

Once I have more information, I can help you figure out what "p8 material" refers to.