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