Adhesives include glue, paste, cement, mucilage, cold emulsion, and thermal
plastic. An adhesive used to close a container is adequate if, when the
container is opened, at least a 50-percent fiber tear occurs on the surface to
which the adhesive is applied. An adhesive used on tapes or box flaps must
remain serviceable in temperatures from -20° to 160° Fahrenheit.
For box flaps, the adhesive should
cover at least 50 percent of the box
flaps and be applied no more than
1/4 inch from the box flap ends.
Alternatively, four strips of hot-melt
adhesive may be used on each part of the
box flap where the outer flap lies over the
inner flap, but only if the strips have the following characteristics:
• Are 3/16 inch wide each (after compression).
• Are no more than 1-1/2 inches apart (with the first strip no more than
1/2 inch from the center seam).
• Extend to the full width of the inner flap (unless hot-melt adhesive is
applied to 25 percent of the area where the outer flap lies over the inner