Abstract: The production of waterproof corrugated paperboard is improved by employing a Stein-Hall type adhesive containing 1.75-5 times the conventional amount of waterproofing resin, and applying the adhesive at about 1/2 to 3/4 the usual rate within 30 minutes after the addition of the resin thereto.

Abstract: Improved Stein-Hall type adhesives having an uncooked slurry portion and a cooked carrier portion wherein the carrier portion is produced by cooking a slurry of a starch having substantial amylopectin content, at an alkaline pH, in the presence of an amount of hydrogen peroxide sufficient to lower the viscosity of the cooked carrier to that of conventional Stein-Hall carriers, viz., so that when added to the secondary slurry, the viscosity of the finished adhesive will be about 40 to 50 seconds (Stein-Hall) at 100.degree.-105.degree. F., and in the presence of a catalyst effective to reduce the cooking time required to reach that viscosity to about 15 minutes or less.