Publicly available materials libraries with paper, plastic, cardboard materials?

Hi,

I'm a newbie to OnShape and the products we design typically include materials such as paper, paperboard, corrugated cardboard, and plastic sheets and films.  The materials library in OnShape seems very limited on these types of materials, (for instance, no material seems to include the word paper, and plastics seem to be missing low-density polyethylene (LDPE), a very common material for packaging.)

1) Is there a publicly available materials library that includes a more full selection of materials like these?

2) Does OnShape plan on building out its own library of materials, which seems a little hit-or-miss?

Thanks in advance,

Steve W.