30 x 3 ¹⁄₂ x 40" 4-piece Mirror Corrugated Boxes

POUND (#) TEST VS ECT (EDGE CRUSH TEST):
 * Overall stronger/thicker box.
 * Greater stacking strength.
 * 50% more side wall bursting strength.
 * Pound test refers to bursting strength.
 * ECT refers to stacking strength.

Closest equivalents:
 * 32 ECT - 200# test.
 * 42 ECT - 200# test DW.
 * 44 ECT - 275# test.
 * 48 ECT - 275# test DW.
 * 51 ECT - 350# test.
 * 82 ECT - 350# test DW.

BOX STRENGTH GUIDELINES: (Maximum weight per box)

                    FIBER BOX           UPS
                     HANDBOOK        GUIDELINES
200# Single Wall     65 lbs             40 lbs
275# Single Wall     95 lbs             65 lbs
350# Single Wall    120 lbs             80 lbs
200# Double Wall     80 lbs             60 lbs
275# Double Wall    100 lbs             80 lbs
350# Double Wall    120 lbs            100 lbs

GENERAL BOX SPECIFICATIONS AND REGULATIONS:
 * All boxes open along the length (first dimension).
 * Seams are glued.
 * Recycled material:
   Liner: 42lb paper, 20-30% recycled material
   C flute medium 26 lb paper, 100% recycled material

FLUTE:
 * Definition: Wave shapes pressed into the middle of the
   corrugated wall of the box.  Most of Uline boxes are
   C-flute.
 * Approximate thickness:
   A flute 3/16"
   C flute 5/32"
   B flute 1/8"
   E flute 1/16"

SPECIFICATIONS:
 * Meets ASTM D3951