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Packaging Supplies Company''s boxes are "200 lb burst test" certified. (We do carry some "275lb burst test" certified boxes too.) This means that the corrugated walls of the box would require 200 pounds per square inch of force to break through the wall of the box. The burst test has been a standard certification for years. wadding and wadding more recently a new certification test has started to be used called the edge crush test (ect). generally, 200lb test boxes are 32 ect. ect is the edgewise-compressive strength, parallel to wadding the flutes of a short column of corrugated fibreboard. test wadding results are reported as the pounds per inch required causing compression failure. ect relates directly to box compression strength which is important in today''s world of box stacking. for wadding certain items, mailing supplies provide a complete protective wadding package that is ready to ship. save time, labor, packaging and shipping costs by using mailing supplies. packaging supplies company offers the following styles of mailing supplies:

carton sealing tape is available in two varieties, pressure sensitive and water activated. pressure sensitive tape is typically made of pvc or polypropylene backing with acrylic, hot melt or natural rubber adhesive. pressure sensitive wadding tape is relatively inexpensive, provides a good bond for many carton sealing applications and is easily wadding applied with an inexpensive tape gun. water activated tape is constructed of kraft paper backing and sometimes includes wadding fiberglass reinforcement. water activated tape requires a stationary dispenser containing water to dispense the tape and activate the adhesive, but forms a superior bond when applied to corrugated cartons. pressure sensitive tape hot melt hot melt tape is also known as synthetic rubber and is typically manufactured with a polypropylene backing. hot melt tape works well from 45-120 degrees, provides a good bond for most carton sealing applications and is the lowest cost pressure sensitive tape available. hot melt will yellow with time, but will do so more slowly than natural rubber tape.