It might be intended for transfer paper or blueprint paper .

In technical automotive guides, such as on the Tacoma World forums, a photo with this name illustrates the use of to clean transmission pans and magnets. How to identify your specific file:

Usually 65lb to 110lb weight to provide structural integrity for folding and gluing.

If you are looking for a specific type of paper associated with this file name, it is most likely one of the following: 1. Art or Specialty Paper