Perma/Dur Barrier Board Document Cases, Tan

Our best boxes measure a pH of approximately 8.5 and are made from a strong 60 pt., solid-core tan board composed entirely of lignin-free cellulose fibers. For added protection, the boxes contain a 3% calcium carbonate buffer to neutralize acidity that may be introduced through handling or the environment. The metal edge we use to construct our boxes offers more "grips" per inch than many other manufacturers, creating a stronger, more durable box. Larger (5") boxes feature a black nylon cord loop that allows easier removal from shelving.