Plain brown double wall corrugated cardboard sheets constructed of one sheet of 200 lb. Test "B" fluting and one sheet of 200 lb. Test "C" fluting sandwiched between three sheets of paper for an extra 350 lb. Bursting strength. Corrugated cardboard is approximately 5/16" in thickness.


Double Wall Corrugated Cardboard Sheets and Pads
Double wall corrugated fiberboard has three flat facings and two corrugated members combined in the following sequence - a facing, a corrugated member, a (center) facing, a corrugated member, and a facing. The principal use of thick, double wall corrugated cardboard is for boxes. It has high stacking strength and has wide application in packaging difficult and heavy products.

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Note: All Corrugated & Flat Double Wall Cardboard Sheets are manufactured in strict accordance with ASTM-D-4727 (Formerly #PPP-F-320).