Ukiah,
I'm not sure there are any outisde of PetScreen or similar geo-grids/woven, and I don't know that I'd trust a sheet plastic grill to be as protective per weight unit as a metal grill given how many shattered plastic parts I've found in car parts, or just about anything else that's been under-engineered.
I'm sure its possible to do a composites/plastics grill that's pretty great based on PetScreen's properties. Which by the way really does keep Bowser or Thomasina from ruining the patio door ; }
Guess this would be a question for someone like Robby Hoinsky. I've got Bowser & the Thomasinas under control (or they me, as it were); more interested in keeping unnamed critters (mice, snakes) from entering the pearly gates of fEARful-land.
And the price was right