I'm not sure what the criteria for "highly" flammable is, I'm sure it's flammable but I've never managed to ignite it with either a blowtorch (singeing the Hess

I'm not sure what the criteria for "highly" flammable is, I'm sure it's flammable but I've never managed to ignite it with either a blowtorch (singeing the Hessian backing on the edges of freshly cut lino) or a laser cutter (both when cutting and engraving). It's also a good material for print making