In discussing the use of Tyvek as music roll material Ray Finch
looks at its characteristics from a user's point of view.  But the
manufacturer is going to need to consider more factors.  Ray does
mention the cost, but what about its punching characteristics?

How many copies can be punched at once?  How cleanly does Tyvek punch?
Does it move smoothly and unattended through the perforator, or does
it require more supervision than a five-year-old in a swimming pool?
Does it dull the punches faster than paper does?

I think that Q.R.S. found that the plastic they used experimentally
was too hard on their perforators, and gave it up as a bad idea.

Matthew Caulfield
Irondequoit, New York