Coroplast® polypropylene twinwall fluted sheet stock for the screen printing industry. Coroplast® is ideal for outdoor and indoor applications, as it is tougher than corrugated fiberboard, as well as waterproof and stain resistant. Sheets are double treated by 'Corona Discharge' on both sides to allow for inks and adhesives to adhere. Coroplast® sheets are used in the following industries and more: graphic arts, packaging, agriculture, automotive, industrial.