PVC/Riser grade versus Plenum grade Ethernet cable

I found about half a 1000ft roll of Cat 5 Ethernet cable. As far as I understand, it's
Space Shuttle
CAT5e
350MHz
24AWG
4 Twisted Pairs
Solid conductors
How can I find out whether it's PVC/Riser grade or Plenum grade cable?
thanks much
Space Shuttle
CAT5e
350MHz
24AWG
4 Twisted Pairs
Solid conductors
How can I find out whether it's PVC/Riser grade or Plenum grade cable?
thanks much