Polycarbonate: This material will not crack under pressure like acrylic will.
The drawback is under heavy pressures polycarbonate will become slightly spongy causing a pressure loss on the press.
Due to this we do not recommend it for uses such as Aqua Tint, Mezzo Tint or Photo Gravure.
However, most printmakers never notice a difference especially when using the thinner polycarbonate material .062"
Acrylic (not available online): This material is not as durable as polycarbonate. Recommended for use with heavy pressure applications.