a laminate sheet having excellent corrosion - inhibiting effects and physical strength , which sheet is useful in packing metal products subjected to influence of changes in outside temperature and humidity , and which sheet is comprised of an inner layer made of a thermoplastic resin containing water - soluble glass powder and optionally a vapor phase corrosion inhibitor , a middle layer made of a thermoplastic resin containing inorganic metal salt corrosion inhibitor , and an outer layer made of a barrier resin with excellent barrier properties against outside air and against ultraviolet rays .