Corona Printing Corrugated sheet PP corrugated sheet is the material of choice for today’s screen printing industry. it is ideal for indoor and outdoor applications. It’s tougher than corrugated fiberboard, lighter than extruded plastic sheet, and is waterproof and stain-resistant. Many standard colors and sizes are available. Custom colors and size are also available. All our hollow sheet are treated by “Corona ” on both sides to allow specifically formulated inks and adhesives to adhere.